A kind of electronic fence around a web site or an intranet that stops non-subscribers or non-employees from accessing the information and facilities installed there.

A specially programmed computer that connects a local network to the Internet and which for security reasons lets only certain kinds of messages in and out. Fiscal Year: The annual period used by a Tribe for internal accounting for its gaming operations.

A means of securing an internal network from unwelcome intrusions from an external network, typically in the case of a business or research computer network by protecting its data and operations from hackers.

Hardware and/or software designed to keep unauthorized outsiders from tampering with a computer system or network. (The system can be a standalone computer, a small Local Area Network or a company-wide network with thousands of users).

A network's firewall monitors all inbound and outbound traffic, allowing only permitted traffic to pass through the gateway to your network system.

Is a barrier (either physical such as a router or software) designed to keep malicious code such as viruses, trojans or hackers away from computers. They are not expensive for small systems. See: http://www.security.iia.net.au/australian_resources/managing_security/firewalls.html

A combination of hardware and software that protects a server and its associated local area network (LAN) from Internet hackers.

A software or hardware device that can help protect your network from outside attacks or unauthorized access. It controls how users outside your network access things inside your network, and often prevents 'unathorized' users from gaining access to network services.

A security program that prevents or alerts you if an attempt is made to gain entry to, or access data from your computer by an unauthorised outsider. They are basically a gateway that verifies the users ID, password or IP address before granting access.

A firewall is a security system that protects an organisation or company's internal network from attack and subsequent damage.

An electronic security barrier to prevent outsiders getting into a computer or network. Firewalls can also be set up to prevent people from getting outside of a computer or network – to prevent company employees from surfing the Internet, for example.

( Fire Wall) A security system of hardware and software for private computer networks. Firewalls are meant to restrict access to outside networks.

System designed to transmit authorised data packets only on a network and to prevent the transmission of unauthorized data.

A hardware or software barrier that restricts access in and out of a network. Firewalls are most often used to separate an internal LAN or WAN from the Internet. See Gateway.

This is a way of analysing and controlling data that is passing between networks. It is often used as a security device to prevent unauthorised access to a network. A firewall will have to be configured to enable video conferencing protocols to pass through it.

A security system, usually for networked computers, which controls access in and out of the network.

A firewall is a program or a device that is used to protect an internal network from external attacks, hacks, and damage through various security measures. It can also serve to regulate what information can be transferred in and out of the LAN. Integrated Services Digital Network (ISDN): ISDN is an outdated technology for providing faster digital connections over phone wires. IP Address: An IP address is a sequence of numbers that are used to identify a computer on the internet. An IP address consists of a set of 4 numbers from 0 to 255 separated by periods, such as 206.64.112.129 A dynamic IP is an IP address that can change whenever a computer logs on or gets disconnected. A static IP is an IP that is given a computer that does not change, even if it disconnects or is shut off.

A software and/or hardware used to prevent unauthorized access from a computer system or network of computer systems. Heuristic scanner A scanning technique that looks for patterns, activities or suspicious code that may indicate a new virus. Most leading antivirus packages incorporate a heuristic scanning technique to detect new or previously undetected viruses in the wild.

A network configuration, usually both hardware and software, that forms a barrier between networked computers within an organization and those outside the organization. A firewall is commonly used to protect information such as a network's email, discussion groups, and data files within a physical building or organization site.

network gateway that filters network traffic to limit access either way only to allowed services; often used to protect security of LAN from hostile access from a WAN connection such as the Internet

An internetwork gateway that restricts data communication to and from a computer network and protects the network's resources against threats from outside the firewall. A firewall is usually placed between a public network, such as the Internet, and an organization's private, internal network in order to implement the organization's security perimeter and enforce the organizations security policy. Many types of firewalls are commercially available.

A software or hardware-based filter that controls access to internal networks by restricting/allowing certain packets from external hosts.

a virus protection program. It protects your computer from hacking and infected downloads.

A firewall is a barrier between your network and the Internet, through which only authorized traffic can pass. This can be either a software or hardware firewall. Software: The program is installed onto your computer to control access between your computer and the internet. Hardware: This is a piece of equipment that connects to the outside of your computer. The Hardware Firewall (Router) Connects to your DSL/Cable modem then to the internet giving you the most protection.

A network security device (a combination of hardware and software) that prevents unauthorized users from accessing an intranet or LAN (Local Area Network).

A security measure that involves putting another computer between your network and another network, like the Internet. This computer is programmed to limit what information and services can be passed from one network to the other.

computer, or program mable device, with associated software which can be used to restrict traffic passing through it according to defined rules. Control s would typically be applied base d on the origin or destination address and the TCP/IP port number. [D04836] RUP

A software and/or hardware system designed to prevent unauthorized access to a computer network.

Hardware and software that protect against accidental or malicious damage to a server by preventing unauthorized access to an internal network from an external source.

security system that prevents non-authorized people from entering or exiting

A system used to shield a computer network from unwanted external visitors. Companies with an Intranet which also allows staff to access the Internet use a firewall to prevent people from outside exploiting that connection to gain access to the Intranet or the firm's own database on its server.

A network security system designed to exclude outside traffic.

A security perimeter of an organization's distributed computing environment. Usually, an organization which wishes to make certain aspects of, e.g., its Internet security easier will force all machines at the site to communicate through one firewall machine. The firewall itself is specially configured to reject most communications from the outside, and to filter the remainder according to various criteria. (Unfortunately, reliance on firewalling tends to mean that any misconfiguration of the firewall machine is fatal, because the rest of the organizations computers are probably very careless configured or monitored. It is nonetheless a common way for many companies on the Internet to try to protect themselves from outside crackers.)

A firewall is a set of related programs, located at a network gateway server that protects the resources of a private network from entry by external or excluded users.

Security partition between your computer and the internet that guards against virus and malicious attacks. Available as software progam or dedicated hardware running monitoring software 24 hours a day.

A system or combination of systems that enforces a boundary between two or more networks and keeps intruders out of Internal networks. Firewalls serve as barriers for packets passing from one network to another.

a combination of hardware and software used to protect a local network from intruders. Some data may be available to people outside the firewall, such as web pages, but more sensitive information will be restricted to those "inside" the firewall.

This is a system of both software and hardware, and it has purpose of limiting the vulnerability of a computer or set of computers from outside attack (i.e., hacking).

A system or combination of systems that enforces a boundary between two or more networks. Firewalls can be incorporated in hardware such as routers or, as is more common, as software such as Windows XP Firewall, Norton Personal Firewall amongst others.

A technology that gives users access to the Internet while retaining internal network security.

this is a proxy server that protects the internal network (intranet). It passes e-mail from the outside to inside and vice versa.

Software or hardware that creates a barrier between a trusted and an untrusted network (e.g. the Internet), allowing or forbidding data to cross the barrier based on a set of rules that an administrator has configured.

security method for preventing unauthorized access into an organization's intranet.

a hardware or software barrier placed between your computer/network and the internet to help protect your system from external attacks.

This is the security barrier that separates one's Net presence from their intranet that manages all that the Net presence offers.

A firewall is hardware (such as a router or dedicated PC) that helps to prevent random users from accessing a local network.

Router(s) or access server(s) that limit the exposure of a computer or group of computers to an attack from the outside.

A system or group of systems that enforces an access control policy between an organization's network and the Internet for purposes of security.

A firewall can be both hardware or software put into place to prevent access from unauthorised users to an internal computer network.

A Firewall is a device usually employed at the gateway of a network. A Firewall allows or disallows traffic in and out of the network based on it's source and destination port, source and destination addresses, the state of the communication and other criteria. A Firewall controls data between networks. It can not interrupt or prevent attacks between hosts on the same network.

Programs and any related hardware that protect the users of one network from the users of any other network (i.e., to protect a network from the Internet). The program usually works in conjunction with a router, a hub-like device that can restrict the flow of data.

A combination of hardware and software that separates a company's computer network from external networks, notably the Internet.

A tool to seperate an Intranet from the Internet by disallowing connections on certain ports, making the Intranet very secure. See also network, intranet.

A combination of specialized hardware and software designed to keep unauthorized users from accessing information within a computer network. An Intranet firewall contains an enterprise's private computer network so that it cannot be accessed by directly from the public internet by those outside the enterprise. An Extranet firewall allows selected outsiders, such as an enterprise's customers or suppliers, to access a part of a network that is controlled by the enterprise, but is outside the enterprise's intranet firewall.

In online networks, a security system often used by corporations that prevents outsiders from entering the local network.

Secures a company or organisation's internal network from unauthorised external access (most commonly in the form of Internet hackers). This could be a dedicated computer equipped with security measures such as a dial-back feature, or it could be software-based protection called defensive coding.

A firewall is a software or hardware application installed on a home or office computer that is intended to prevent unauthorized users from accessing that computer. With hacking and network intrusions on the rise, they are becoming essential in protecting private information. Four popular types of firewall are packet filtering, application gateways, circuit-level gateways, and proxy servers. Firewalls however can often block necessary video conferencing information. An H.323 Proxy solves this by establishing two connections – one to the caller and one to the person called. The information is then transferred from one side to the other, with necessary changes so that the information can go around the firewall. For firewalls that aren't H.323 aware, it is necessary to manually open select ports.

A firewall's job is to keep a computer or number of computers safe from harm. It can be a computer program or it could be a real piece of hardware. There are people out there on the web (hackers) who will want to get access to your computer and do any one of a number of malicious things to it. It's important to make it as difficult as possible for them to do so. A good free firewall is Tiny Personal firewall - available at http://www.tinysoftware.com

In computing, a firewall is a piece of hardware or software which functions in a networked environment to prevent communications that are forbidden by the security policy.

A software program that will not allow unauthorised intruders (such as hackers) into a computer or computer network.

This is a combination of software and hardware that filters or blocks traffic from a public network. A firewall renders parts of the private network inaccessible and invisible to the public network. It prevents unauthorized and/or unrecognized access.

Special hardware and software used to prevent unwanted or insecure transfers of information. Operates by applying predefined rules to restrict the types of information, sources, destinations and communications ports. Firewalls are used to monitor the ports and close unwanted ones. However, some stealthy P2P software and viruses can bypass simple firewalls by finding and misusing any open ports. A firewall is now an essential defence for any Internet connection, especially for any always-on or broadband connection. An effective firewall not only protects your computer but can also prevent it from being used by a third party to attack other computers. See also denial of service attack.

A security feature or software that restricts the flow of information from the internal network of a company to the Internet and vice versa. This is mainly to prevent the invasion of hackers via the Internet to the sensitive information on the local network of a company. Table of Contents

A security measure that prohibits users in certain local area networks (LANs), such as one belonging to a corporation, from receiving or sending certain types of digital content. Some firewalls prevent the transmission of audio and video files.

A combination of hardware and software that separates a LAN into different parts, which restricts access to certain users for security purposes.

A firewall is a piece of software or hardware that provides a barrier between your computer and the Internet. A firewall will prevent intruders or ‘hackers' from gaining access to your computer and should be updated regularly. Popular personal firewall software such as ZoneAlarm Internet Security Suite from Zone Labs, McAfee Internet Security Suite, or Norton Internet Security can help to protect your computer. Find out about the special  security software discount offer from Zone Labs.

A device that protects a private network from the public part, or a computer set up to monitor traffic between an Internet site and the Internet. A firewall is designed to increase a server's security by keeping unauthorized outsiders from tampering with a computer system.

A security device or software that protects a private network from unauthorised access

A dedicated gateway machine with special security precautions used to service outside network, especially Internet, connections and dial-in lines. The idea is to protect a group of more loosely administered machines hidden behind the firewall from unwanted entry from outside the firewall.

An application or an entire computer (e.g., an Internet gateway server) that controls access to a network and monitors the flow of network traffic. A firewall can screen and keep out unwanted network traffic and ward off outside intrusion into a private network. This is particularly important when a local network connects to the Internet. Firewalls have become critical applications as use of the Internet has increased.

A system or set of systems through which all traffic between an internal network and an external network (usually the Internet) must pass. The firewall allows only authorized traffic to continue to the other side, where "authorized" is defined by the firewall-owner's security policy. Firewalls come in three types: packet filtering (usually implemented with a screening router), circuit gateways, and application gateways (usually implemented with a dual-homed host and proxy servers).

A security method that is used to protect a local area network from unauthorized access through the Internet. Firewall security software usually includes several protection features.

Computer software developed to protect against unauthorized access to private data by means of the internet.

a security system to restrict access to certain computers, areas or information - a firewall is normally a computer or router that is put between a local network and an external network such as the Internet - it will normally enable all users on the inside to connect to the outside, but not the other way around

Protects networks from unauthorised incoming and outgoing access.

A system implemented in both hardware and software, located at a network gateway server, that protects the resources of a private network from outside users.

A gateway designed to limit access to or from a private network. Firewall's can be used in both hardware and software. They are frequently used to prevent unauthorized users from accessing private networks. Firewall's regulate certain levels of security and maintain by acting as the "gatekeeper".

A method of protection by only allowing certain items in and out of a group of computers.

Computer hardware and software that block unauthorized communications between an institution's computer network and external networks.

Software or hardware, used on networks, that prevents outside or undesired access.

Firewalls are most commonly software products that regulate data flow between a computer in a local intranet (e.g. a company network or a single home computer) and computers in open networks (e.g. the internet) and ensure that unwanted contents (e.g. files potentially containing viruses) are not transmitted. This is often done by blocking traffic on many ports.

1. n. In communication, a functional unit that protects and controls the connection of one network to other networks. The firewall (a) prevents unwanted or unauthorized communication traffic from entering the protected network and (b) allows only selected communication traffic to leave the protected network. 2. n. In equipment, a partition used to control the spread of fire.

Internet security to protect a LAN against hackers. A combination of hardware and software acts as a firewall to separate the LAN into two parts. "Normal" data is available outside the firewall, while "hot stuff" is inside the firewall.

A method of protecting your network from another network. A firewall blocks unwanted access to your network while giving you access to networks outside of the firewall. Firewalls are usually both software and hardware based.

Firewalls can limit and stop access to computers by unauthorised people or systems. A personal firewall can be installed on your home computer to protect it from intruders on the Internet. Firewalls can be used to stop the spread of viruses and Spam and can be a valuable tool in protecting children online.

The goal of a firewall is to protect a network (or just a computer) against externals attacks.

Firewalls prevent outside programs, hackers, and other undesired viewers from gaining access to a system. Firewall software is usually set up on standalone computers acting as filters for incoming information.

a device that protects a network from unwanted traffic, including hackers etc. Can also be used to administer privilege: who gets to see what on the Internet. Generally also used as a DHCP server and for IP translation (NAT).

In its most basic terms, a firewall is a system designed to control access between two networks. There are many different kinds of firewalls—packet filters, application gateways, or proxy servers. These firewalls can be software programs or dedicated hardware devices that were designed solely as firewalls.

A combination of hardware and software that limits access to a particular computer or network for security purposes.

A device, mechanism, bridge, Router, or gateway which prevents unauthorized access by hackers, crackers, vandals, and employees from private network services and data.

keeps out the big bad wolf. Most of the time, local networks are connected to the great out there through a gateway computer. This computer can become the firewall by installing software made for this purpose.

A firewall is protection software or hardware which protects a secure internal network connected to a public network (for example the Internet) from viruses, hackers and other dangerous data.

A type of Internet security that protect a computer or a computer network from unauthorized access. A firewall can be a piece of software or a combination of hardware and software.

A system that separates a local internal network from an outside network such as the Internet. When configured, a firewall prevents unauthorized TCP/IP packets from passing into the local network from the outside, and vice versa.

System to prevent unsanctioned access to and from a private network.

Rather overused term that describes a device (or series of devices) used to protect an internal network from an external network.

A device or computer running special software that can protect your network, and computers on your network, from being accessed without authority

A barrier made of software and/or hardware, between two networks, permitting only authorised communication or users to pass.

Used to isolate sensitive or private materials from the general Internet. To access the material behind a firewall, users usually need a Username and a Password.

Computer device which allows selective passage of data flows between an internal network and a public network, and neutralizes attempts at access from the public network.

An Internet firewall provides security for a site by restricting or preventing access to internal machines by outside computers. A typical firewall is safe from hostile Internet users because it allows no direct connections to internal machines and relies on proxy servers or other trusted programs to carry communication across the wall.

A general term for security software that protects a computer network connected to the Internet. It prevents anyone gaining unauthorised access to the network from an outside computer - and therefore can present a barrier to streaming if not configured appropriately.

A method in which a network is protected from unauthorized access such as hacking.

Designed to prevent unauthorized individuals from breaking into a network. Can be employed in both software and hardware.

Software that is designed to restrict access to an organization's network or its Intranet.

A firewall is a security barrier set up between a company's internal systems and outside systems. Firewalls can be designed to keep hostile visitors out or keep company employees in.

A firewall is a software or hardware application installed on a home or office computer that is intended to prevent unauthorized users from accessing that computer. With hacking and network intrusions on the rise, they are becoming essential in protecting private information. Four popular types of firewall are packet filtering, application gateways, circuit-level gateways, and proxy servers. Although they can be difficult to configure correctly, they are a critical component to protect unauthorized access and hacking of IP based surveillance systems that are LAN based.

A point of interconnection between two networks that filters or blocks the transmission of certain classes of traffic. May also provide relay services to compensate for the restricted access. Typically positioned between an organization and the outside world so as to prevent unwanted access to and/or from other networks.

A computer with a defined set of rules to filter Internet traffic based on network address, ports, protocols, etc.

A set of related programs located at the gateway server of a network that protects information contained within the network from users outside the network (on the Internet).

A firewall is a method of securing a company's computer files by preventing unauthorised access to or from a particular network or individual computer through the use of hardware or software, or both.

A method of protecting files and programs from users on another network. It blocks unwanted access to a protected network, but gives the protected network access outside the firewall. Companies typically install firewalls to give thier employees access to the Internet while protecting internal information.

Often a firewall is placed between the outside world and the internal corporate network. It is often configured to only allow a small number of ports to work (e.g. port 80 for HTTP).

Provides protection to a network from hacking and unauthorised access by filtering types of data, sources and destinations.

A computer that regulates access to computers on a local area network from outside, and regulates access to outside computers from within the local area network.

A firewall is either a hardware device, or a program that can be used to protect your computer from unwanted attention by masking your Internet connection.

Hardware and/or software that separates a Local Area Network (LAN) into two or more parts for security purposes.

A hardware or software component dividing two networks. Used to provide security or networks and computers.

A special server which works in conjunction with and prevents unauthorized access to or from a private network of computers.

A firewall is a safeguard utilized by many Local Area Networks (LANs) or Wide Area Networks (WANs) to protect the network from unauthorized access from the outside. They are basically gates that verify the users before they leave or enter the network by way of a User ID, Password or IP address.

A firewall works as a barrier between networks, e.g. between a Local Area Network and the Internet. The firewall ensures that only authorized users are allowed to access the one network from the other. A firewall can be software running on a computer, or it can be a standalone hardware device.

a security measure that helps protect your server.

A software- or hardware- based solution that is designed to prevent unauthorized access to a corporate data network or LAN (Local Area Network). Click here for an example of a good firewall offering the maximum protection.

A firewall can be implemented through hardware or software and will help to prevent the unauthorised access of your computer by unauthorised users.

A software application that blocks unwanted data and traffic to a computer network based on set security guidelines.

A virtual barrier between a LAN (Local Area Network) and other networks, e.g. the Internet.

A security program which limits access to computers linked to the Internet.

The computer file system of a site's inner network that is protected against unauthorized access by Internet users | français

This software provides security against outside attacks by hackers that may be after sensitive information.

Online security system that keeps confidential data from unauthorized individuals by separating it from public information.

Technology that allows users access to the Internet while providing internal network security.

A system that protects a private network and its resources from unauthorized access.

A security barrier that separates sensitive files from public files. A password is often needed to obtain information from these pages.

Hard and/or software that controls the data flow between a private and an unprotected network (LAN, Internet).

Security measures that protect the resources of a local network from intruders.

A computer that acts as a security gateway between a local network and a larger network. The firewall monitors and restricts data traffic between networks according to various security criteria specified by the systems administrator/computer security person.

A safety measure that tries to prevent unauthorized people from getting access to the Local Area Network (LAN) of your own PC. An INternet user who installed a firewall, can get access to the Internet, but only a restricted amount of traffic is able to get in.

A router or access server that serves as a buffer between connected networks or interfaces. Uses access lists, protocol filters, and other methods, to safeguard network resources.

a security device to help protect a private network from Internet hackers. It is a machine with two network interfaces, configured to restrict which protocols can be used across the boundaries, and to decide what internal IP addresses can be seen to the external Internet

A dedicated gateway machine with special security precautions on it, used to service outside network, especially Internet, connections and dial-in lines. The idea is to protect a cluster of more loosely administered machines hidden behind it from hackers.

A system that prevents unauthorized access to or from a private network. Content exclusive to Prodigy Internet is referred to as "within the firewall," which means that non-members cannot access it.

a program used to protect a computer from intruders.

A system (usually a combination of harware and software) that protects a network from intrusion by unauthorized users or programs (such as viruses). Firewall software is typically installed on the machine that connects a private network to the Internet where it can monitor all data passing to and from the Internet. Firewall are programmed to be purposefully paranoid, so they can sometimes interfer with legitimate data traffic if not properly configured. Almost all major institutional network have a firewall and that fact can require some additional configuration of software on users' computers to allow seemless connection to the Internet through that firewall.

Used to stop unwanted access to either a computer or a network. If you are using a PC, particularly if you are using broadband we recommend you consider installing the free version of ZoneAlarm.

Software and/or hardware combination that protects a computer or network from unauthorized access.

is a combination of hardware and software that prevents a visitor to an organization's Web site from gaining access to other information stored on the organization's computer network, such as corporate records or employee information.

A way to ensure that data on a Web server or connected computer will not be available to anyone on the Internet. Firewalls block outsiders from accessing private information or altering your Web site.

A gateway between your machine(s) and the Internet. Commonly used by companies to limit or monitor external access to their machines and - on occasions - to control what their employees can access over the Net.

A security wall between a closed area (e.g. a LAN) and the outside internet.

An impassable boundary to most Internet traffic. It forms a wall around networks or individual computers protecting them from potential harm.

A software program running on a server that protects a collection of computers from access by unauthorized outside parties.

A gateway that screens all traffic between an internal, protected network and an external network, and permits only authorized traffic to pass through.

Program or equipment to filter or prevent net traffic from accessing the computer freely

A network security device that filters communications between networks. Firewalls are primarily used to protect LANs from unwanted or malicious communications coming in from the Internet. Firewalls can be hardware or software based, and can be installed to protect entire LANs, individual computers, or both. Firewalls are often used in conjunction with intrusion detection systems, which report suspicious network traffic. Back

Specialized software and/or hardware designed to prohibit unauthorized access to information on a computer network. A firewall blocks unapproved data from/to a computer.

Security system meant to help protect your internal network from unauthorized external access. Used to help block users from viewing inappropriate sites on the Internet. Also known as a proxy server.

A firewall is used to protect a networked server from damage by those who log in to it. This can either be a computer equipped with security features, software protection, or both. A firewall allows only certain messages from the Internet to flow in and out of the internal network.

Software and/or hardware that protects systems from access by unauthorized users and programs.

Hardware or software that stops unauthorized users from accessing a network.

This is barrier of hardware and software to separate a Network into many parts for security purposes. It is aimed at keeping hackers and viruses from corrupting a network.

A firewall is a device which provides a barrier between your computer equipment and the internet. Firewalls usually also provide the hardware and software to establish a Virtual Private Network (VPN). Companies providing public access to their LAN use a "Firewall" to secure their system.

A configuration of software that prevents unauthorized traffic between a trusted network and an untrusted network.

A software or hardware "wall" that keeps hackers and malicious software out of a network. Some firewalls are also used to keep employees using an internal company network from browsing the web. A router firewall acts as a hardware firewall between your computer and the internet, preventing contact requests from the internet from reaching your computer. A computer firewall is a software firewall. Software firewalls have the limitation of being able to filter only incoming packets, and cannot monitor or filter outgoing packets.

A security system that restricts traffic between a secure network and the outside world. The secure host computer is the only computer in the organization that is actually connected to the Internet. Everyone in the organization must go through the host computer to connect to the Internet, and vice versa.

A hardware and/or software method used to protect a network from unauthorized use by those outside of a network. Two commonly used types of firewalls are packet level and application level. Businesses and organizations that have connected their computers to the Internet often install a firewall to protect their data from theft and alteration.

A device installed at the point where network connections enter a site that applies rules to control the type of networking traffic that flows in and out. Most commercial firewalls are built to handle Internet protocols.

A firewall implements an "access control policy" to and from networks that are linked to your network via the Internet. Some firewalls only permit email traffic to and from the network, thereby protecting against any attacks other than attacks against the email service. Other firewalls are less strict allowing such services as web servers and file transfers. Most firewalls block unauthenticated interactive logins from the ``outside'' world helping to prevent vandals from logging into machines on your network. More elaborate firewalls block traffic from the outside to the inside, but permit users on the inside to communicate freely with the outside.

A firewall is a program that helps protect your computer and its contents from outsiders on the Internet. It stops unauthorised access to and from your computer.

A combination of hardware and software located at the gateway server of a network that protects information contained within the network from users outside the network (on the Internet).

a set of related programs that protect the resources of a private network from users from other networks. These programs execute on the private network's gateway server. A firewall can also control which outside resources the internal users are able to access.

A firewall is a protective security screen designed to help prevent unwanted users from getting access to a computer network. Similar in concept to a firewall in a commercial building, which helps to keep a fire from spreading, a software firewall helps protect your computer from unauthorized access. No large company with an online presence would dare operate without a firewall. The firewall also allows the network administrator to monitor what users are doing within a network. See also anti-virus.

A system that secures a network and prevents network access by unauthorized users.

A piece of hardware or software to monitor and protect against external network access to machines

A firewall is special-purpose hardware or software that is designed to restrict access to a computer or network. Firewalls are used with the Internet when companies or individuals want to grant information access only to certain people.

A computer that acts as a shield between you and other computers on the Internet as a security measure.

A firewall protects your computer network from the internet by preventing network traffic communicating between each other. That's great to prevent malicious attacks however it can cause havoc if you are trying to get your ip telephone to work. All routers have a firewall built in. Information about routers is available on this site on the routers page.

Software loaded onto an intranet server for security purposes. Firewall software controls access from outside the intranet.

In networking, a firewall is a computer that prevents an intruder from accessing all the computers on a network if he or she manages to break into one computer someplace. The firewall usually sits between your inside network and the outside Internet. For more information, see Cheswick & Bellovin's approachable book Internet Firewalls: Repelling the Wily Hacker.

A system that prevents unauthorized users from logging in to a private network (usually one that's connected to the public Internet). It can also be used to keep users inside the firewall from accessing computers outside the firewall.

A hypothetical "wall" is actually a piece of software that protects a private network from intrusion via the public Internet.

The term for any security measures taken, whether software or hardware, that protect and or limit a user's access to the Internet. A type of router that watches the messages being passed through it and controls which messages are allowed through.

A mechanism for filtering network traffic that protects a local network from unauthorized access from the outside.

special security software to protect private networks such as intranets and extranets

Hardware or software firewalls are available, both serve to protect your PC from unauthorised parties over the internet.

A firewall protects data networks from external threats. All data traffic between the network and the outside world must pass the firewall. Only data deemed safe according to the security specification may pass.

A program or device which serves as an intelligent and secure router of network data packets. These mechanisms are configured to restrict the flow of packets in different directions (i.e. to and from the Internet) based on the system addresses (a.k.a. IP addresses) of the connected computers.

A network device, to secure data and prevent unauthorised hackers from entering a private network

A dedicated gateway computer that holds no sensitive data. The firewall intercepts and filters incoming data packets in order to block direct access to internal computer systems.

Computer system, router or pair of routers between the Internet and a private network to prevent unauthorised users from accessing the private network.

A computer or electronic device that protects the security of an internal network from intruders on an external network. Firewalls monitor, intercept, and process network requests before passing them between the internal and external networks.

In a computing context, a firewall is a system that controls access between two networks. Some firewalls place restrictions on what is permitted to pass between networks, others limit what is not permitted to pass between them. Although there are several different mechanisms for performing this access control, the essential point is that a firewall implements a network security policy.

A hardware device or piece of software which regulates access on to part of a network. Usually used to prevent unauthorised access from the Internet to a particular computer or local network.

A computer software program or hardware that will block intruders from entering your system. Firewalls are designed primarily to prevent unauthorized access to your computer.

software and hardware that acts as a protective barrier between your computer or network and the outside world.

a software application that isolates part of a network e.g. a company's Intranet, to prevent it being publicly accessed.

The general name used for any method to preventing unauthorised access to a service or server, or for stopping certain message types.

A device which enforces a security policy. Typically used to prevent unauthorised access from the Internet into a private network.

Either a software application or separate piece of computer hardware that, when loaded onto a computer that has a connection to the Internet, stops unwanted visitors being able to access files on that computer. It is absolutely critical for computers or servers that have an "always on" connection to the Internet, such as ADSL or cable modem, to have an appropriate firewall application in place.

Hardware or software designed to prevent unauthorised access to a computer or network over the Internet.

A set of security tools designed to separate an internal network from the public Internet in order to keep unauthorized users out of a restricted network.  Firewalls are the primary line of security defense for businesses.

A program or dedicated computer that creates an electronic boundary thus preventing unauthorized traffic to your PC or Network is called a Firewall.

Involves the use of related programmes or appliances located at a network gateway server for the protection of a private network, its systems, and applications.

A system configured to control access to or from a network. Firewalls can be implemented in both hardware and software or a combination of both. A firewall examines each network packet to determine whether to forward it toward its destination.

A form of digital security, computer hardward and software, sits between a Web Server which links to Internet, and the rest of the computers which are not allowed to be accessed by unauthorized Internet users. Firewall provides added security protection for company's internal computer systems. » Back to top of screen

A network node that prevents traffic from one segment of a network from crossing over into another. Firewalls are used to protect internal systems from unauthorized external access.

A form of Internet security that stands between a private network and the Internet. A firewall can prevent unwanted traffic from passing through.

A dedicated gateway machine with special security precautions on it, used to service outside networks, especially Internet connections and dial-in lines. Used to protect a cluster of more loosely administered machines hidden behind it from unauthorized access.

A firewall is a program that prevents other people on the Internet from accessing your computer and your files.

A security feature that protects a network by preventing intruders to connect.

A security system intended to protect an organisation's network against external threats by preventing computers in the organisation's network from communicating directly with computers external to the network and vice-versa.

A collection of hardware and/or software intended to protect a computer or computer network from unauthorized access.

A security interface or gateway between the Internet and internal computer resources. A firewall is some combination of passwords, authentication techniques, software, and hardware.

Any of several ways to protect a network from an untrusted host or network. Consists of mechanisms to block network traffic and mechanisms to permit network traffic.

A firewall controls the passage of information on a computer network. All firewalls involve both hardware and software, but the term hardware firewall generally refers to a network switch, router or similar electronic equipment and associated software. Hardware firewalls can be used to prevent types of network traffic that can be used maliciously. A software firewall is a program that runs primarily on a laptop or desktop computer (although it can also be used at the enterprise network level). A firewall is ordinarily set to permit only certain applications to access the Internet, and to warn the user if other programs try to do so.

A computer device that separates a local area network from the internet and prevents unauthorized access to the local area network through the use of electronic security mechanisms.

A system designated as a buffer between any connected public networks and a private network. A firewall uses access control lists and other methods to ensure the security of the private network. A firewall's main task is to filter traffic. Recent firewalls have additional advanced features.

A Firewall is a method whereby a computer, or an entire network of computers, is protected by a software or hardware configuration that monitors and analyzes the incoming and outgoing traffic. Most home users place a firewall between their modem and their computer, thereby protecting themselves from most would-be intruders.

A security mechanism--such as the Microsoft Proxy Server--that provides Internet access from desktops inside an organization, while at the same time preventing access to the corporate LAN by outside Internet users. See also Proxy Server.

A dedicated device used to enforce a network security policy allowing legitimate traffic in and out of a network whilst blocking invalid network traffic

A security system on the network that prevents unauthorized users from accessing information.

A system with both hardware and software components that manages information flow between an organisation's internal private network (intranet) and the internet. They can be used to filter out certain types of traffic, to block access to unauthorised internet users while permitting access to certain trusted users and systems.

A firewall is a set of programs that protect a private computer network as is found in most companies, from other networks. In other words it is designed to stop unauthorised access to your computer systems.

A software firewall is provided by a software Application (qv) installed on a PC; it is a barrier between the PC [or network (qv)] and the Internet and wide-ranging controls allow the PC User to limit incoming and outgoing communications, the objective being to prevent unwanted intrusions and outgoing communications. A hardware firewall [which is normally included in a router (qv) but can be stand-alone] blocks or permits selected (incoming only) communications to selected ports on a network (qv).

Hardware and/or software used to divide a LAN into two or more parts for security reasons.

security system which acts like a safeguard between a private network and any public network. Prevents hackers from getting into your private network and access confidential data

A hardware or software link in a network that relays only data packets clearly intended and authorized to reach the other side.

A security procedure that places a specially programmed computer system between an organization's local area network (LAN) and the Internet. The firewall computer prevents hackers from accessing the internal network. Unfortunately, it also prevents the organization's computer users from gaining direct access to the Internet. The access that the firewall provides is indirect and mediated by programs called proxy servers. back to menu

The barrier used to keep unwanted traffic from traversing an internal network. They allow or deny netwrok activity according to its origins, destinations and type, but not by content.

Software or Hardware "barrier" that controls what comes in and out through your internet connection. A security measure designed to stop potential hackers gaining access to your computer. Read about Firewall settings.

a device designed to enforce the boundary between two or more networks, limiting access

An application or a dedicated computer that protects the resources of one network from users on other networks. See VPN.

Security filter made up of hardware and software designed to protect individual computers and/or computer networks from access by unauthorized users.

Router, or routers placed between an internal network and an outside network to provide security by filtering packets. Firewalls prevent undesirable activity by preventing certain types of packet passing between the networks.

A specialized piece of software that allows a network of computers to be connected to the Internet and at the same time, only letting specified information in and out of the network.

Software and or hardware that controls access to a local area network.

Protective software and hardware that block unwanted users and activities from intranets.

A security device in place between the Internet and an organisation's network, or within a network, and only passes authorised traffic. A logical or physical discontinuity in a network to prevent unauthorized access to data or resources.

is a piece of hardware and/or software which functions in a networked environment to keep a computer secure from intruders. A firewall allows or blocks traffic into and out of a private network or the user's computer.

A program that protects the resources of one network from users on other networks. See Internet, Extranet, VPN.

Protocol analysis based intrusion detection program for home and corporate users. That prevents hackers from compromising your computer.

A firewall is a system or combination of systems that helps to prevent outsiders from obtaining unauthorised access to internal information resources. The firewall enforces the access control policy, i.e. permit or deny, between two networks. It provides a single point where access control and audit can be imposed.

A security system that controls traffic flow between networks. Several configurations exist: filters (or screens), application relays, encryption, demilitarized zones (DMZ), and so on. Firewalls have two forms: a firewall may be software program running on your computer or it may be a separate piece of hardware that watches what is being sent and received over a network. Firewalls can block transmissions that are unexpected or disallowed. They can also control communications between you and the outside world.

Systems or programs that are designed to prevent unauthorised access to a computer.  They work by looking at every message that goes in and out of the firewall.  Files that could cause harm to your computer are blocked.

a machine or a dedicated piece of hardware that in the topology of a local network is the single connection point to the outside network, and which filters, controls the activity on some ports, or makes sure only some specific interfaces may have access to the outside.

Network hardware and software that limits access between an internal network and the rest of the Internet. Generally achieved by blocking tcp ports.

A firewall is software located at a network gateway, which protects the private network from users from other networks.

A software or hardware solution to protect a single computer or a computer network from attacks by malicious users. Some firewalls can stop both outside attacks and malicious programs trying to send unauthorized transmissions to outside parties.

A combination of software and hardware which monitors a computer or network for unauthorized access.

Software and/or hardware that sits between an internal network and the Internet. A firewall is designed to prevent intrusion, viruses, etc. more.

software program that prevents people from the internet from accessing a secure area of an Intranet. An Intranet within a group of companies might have the company stock details, prices, and goods availability accessible on the internet, but may not want the general public to have access to its accounts or payroll for instance.

Firewalls can be both hardware and software which restrict access by unauthorised users to a network of computer.

A security router that filters traffic based on addresses.

Security system limiting access by outsiders to the system of a Web site.

Special software designed to protect a private computer system from unauthorized access ie. to keep hackers out. The JCU computer system is protected by a firewall.

A gateway used to protect a server or a network from unauthorized access. A firewall generally consists of both hardware and software components.

A system or group of systems that enforces an access control policy between two networks with the properties of allowing only authorized traffic to pass between the networks from inside and outside the controlled environment and is immune to penetration.

firewall, which can be either software or hardware, is designed to block access to a computer or computer network from the Internet.

A Firewall is a security system that acts as a protective boundary between a network and the outside world.

A firewall is a router, server, or hardward/software combination that filters network traffic to protect a network from unauthorized access.

A software and/or hardware system that isolates a company's computer network from outsiders.

Hardware or software that protects the information and resources of a computer from outside users not authorized to access the resources.

Refers to the network node used to protect internal systems from unauthorized external access.

A computer situated between a network and the Internet that restricts data flow. Firewalls can be used for censorship, security and restriction of a range of services. A firewall prevents computers in the organization's network from communicating directly with computers external to the network and vice versa.

A combination of software and hardware linking a corporate network to the Internet in such a way that corporate network users are able to access and consult the Internet, but external Internet users cannot gain unauthorized access to the company's computers.

A system designed to prevent unauthorized access to or from your computer. Firewalls are frequently used to prevent unauthorized Internet users from accessing private computers connected to the Internet. All messages entering or leaving the computer passes through the firewall, which examines each message and blocks those that do not meet the specified security criteria. The most popular firewall programs are Norton, McAfee, and ZoneAlarm.

Protection for a computer or network from unwanted outside access. Use software like NetBarrier to set up a firewall on a personal computer.

Computer system which prevents some information from passing through it. Passes authorised requests from one side to the other, rejecting unauthorised requests. It maybe used to give access to the Internet, while protecting your computer from anyone else.

A security system that prevents computers on a network from communicating directly with computers on another network. Instead, all communication is routed through a proxy server, which determines whether a particular message or file may pass to or from the host.

is software that gives sophisticated protection of your system while it is connected to the Internet. The firewall blocks unauthorized access of your private information. It works by analyzing the routine Internet data coming into and leaving your computer.

Software or hardware that filters or blocks traffic from a public or private network, preventing unauthorized or unrecognized access.

Imagine a wall with a gate protected by security guards - but on your computer. A firewall is a program that sits between your computer and the Internet (or other connection) and only lets specific types of data through, just as the guards will only let people through with a security pass. It protects the computer and the data stored on it from prying eyes, hackers and viruses. A firewall is often used by companies to protect office computers.

A form of Internet security that typically stands between a private network and the external Internet (although internal firewalls are also now increasingly common) and is designed to prevent unwanted traffic from passing.

a security system that separates a secured network from other network components. Firewalls can allow only authorized traffic, and prevent or detect network attack.

A firewall is a system that secures a network, shielding it from access by unauthorized users. Firewalls can be implemented in software, hardware or a combination of both. In addition to preventing unrestricted access into a network, a firewall can also restrict data from flowing out of a network.

A combination of hardware and software tools that provide security to a site, by refusing to allow certain types of information to pass between two computers or local area networks. Firewalls may restrict access to certain types of information (such as e-mail or text only) or restrict access to that between certain locations (thus preventing access by unknown users).

A hardware device (or collection of devices) that is placed between two networks. One network is considered inside the company (safe) and one is considered outside the company (not safe). All traffic, both from the inside and outside, must pass through this device. The firewall limits access to authorized users and systems by filtering packets as they come in based on the source or destination address, as well as an application's TCP/IP port. On the Internet, firewall, bastion host, and secure Internet Connection are synonymous.

Software/hardware used to prevent unauthorized access from a computer system or a computer network. It also connects a local network to the Internet and for security reasons only allows certain types of messages through.

Security software designed to protect a network from unauthorized and/or unwelcome access.

a computer security system of both hardware and software between an internal system and the Internet to limit the information flowing into and out of the internal system, limiting access to hackers

A firewall is a program that polices all the communications going between a computer and the internet. If unauthorised programs try to hack in, or viruses try to send messages out, the firewall will block them.

A device or piece of software that is designed to control access to a computer or an entire network. Firewalls are often used to control who can access a system and what programs or protocols can be used. Also see Understanding Firewalls

A set of security procedures that separates & protects data on a computer or network from hackers and who might access the computer from the Internet.

Network protective software

An electronic barricade to keep external crackers out of internal computer systems or sensitive directories. Password schemes are a common form of a firewall.

A combination of hardware and software used to prevent access to private network resources.

Firewalls are widely used to give users access to the Internet in a secure fashion as well as to separate a company's public Web server from its internal network.

Firewall is a term adopted from a real world, fireproof wall that is used to keep a fire from spreading from one room to another. In Internet terms, a firewall is a piece of software, or hardware with software, that is programmed to recognize certain types of intrusions and scans, and both warn you that they are occurring and prevent the intruder from taking malicious action against your computer or network.

network security system used to restrict external and internal traffic

protective filter software that prevents other users from entering your computer

A hardware or software component that limits or denies access to resources on an intranet from users on the Internet.

a security system that uses rules to block or allow connections and data transmissions between your computer and the internet

Software intended to prevent unauthorised access to a computer network.

A network device or a program running on a server, that filters network traffic implementing security rules and restrictions.

A hardware device and software program that separates a computer or network from the Internet for security purposes.

Software or Hardware that creates a protective barrier between the network and the rest of the Internet.

is an electronic barrier between internal and external computers in a network, controlling the flow of information between the two.

A device (hardware and software) which protects a user's internal network from an outside "hostile" network. Commonly used when a business connects to the Internet.

Firewalls are used to filter and stop information sent and received via the Internet. They are used as a means of keeping networks secure.

A security system which restricts access to computers on a local area network from the outside world, eg the Internet.

Hardware and/or software that blocks undesired users and systems from accessing protected systems or data.

A device which sits between your internet connection and the rest of your computers, a firewall acts as a gatekeeper, only allowing legitimate traffic to pass through and keeping out many kinds of unwanted internet activity.

A security mechanism designed to protect Intranet or local area network from the Internet.

a device interconnecting computer systems or networks with the purpose of providing the capability to filter network traffic between those computer systems or networks for the purpose of protecting some of the systems from security attacks.

A security system that helps protect a network from external threats, such as hacker attacks, originating outside the network. A hardware Firewall is a connection routing device that has specific data checking settings and that helps protect all of the devices connected to it.

Technology that provides a protective barrier between a business's computer network and computers outside of that network. According to the business's preferences, a firewall can secure internal data from unauthorized users and filter out unwanted network traffic such as junk e-mail or computer viruses.

A firewall is an essential part of security on the internet it prevents harmful intrusion of your computer or network.

A software security device used to prevent unauthorised external access to a network.

A firewall acts as a barrier between your computer and the internet. When installed it will help prevent intruders or 'hackers' from gaining fraudulent access to your computer.

A specific mechanism(s) that controls access between two networks.

A piece of hardware or a software program which prevents or filters incoming Internet requests to a computer or network. ZoneAlarm is a software firewall, the SMC Barricade that I showed in the back room is a hardware firewall.

Hardware and/or software designed to prevent unauthorized access to or from a network or computer.

A computer or device that acts as a "gateway" for all packets (information) going in and out of the network. Used to restrict certain activities and block access. A firewall works by inspecting the packets and blocking/allowing connections to certain ports. A very useful tool to prevent virus/spyware infections. A firewall can also be a piece of software installed on an individual computer that controls ingoing and outgoing access between the computer and network. See: Stateful Packet Inspection

A method of protecting information from unauthorized (and/or undesirable) access.

A security system (usually software-based) used to protect an organization's internal network from external, unauthorized intrusion.

A computer specially configured to protect a network (or even a single computer) from unwanted attempts to transfer information between the protected systems and an external network (usually, the Internet). Firewalls are fundamental to security but not sufficient in themselves and must be configured properly to be effective.

Hardware or software that monitors Internet traffic coming into or out of a computer.

A mechanism for protecting a proprietary computer network (or intranet), allowing internal users to access the Internet, while preventing external Internet users from penetrating the intranet.

A firewall is a computer program that acts like a barrier, protecting a company's internal network from unauthorised external access (most commonly in the form of Internet hackers).

A software program that acts as a gatekeeper between networks, such as between the Internet and a corporate network. Firewalls filter Internet and intranet traffic, protecting against hackers, bad code and computer viruses.

A system of software and/or hardware that resides between two networks to prevent access by unauthorized users. The most common use of a firewall is to provide security between a local network and the Internet. Firewalls can make a network appear invisible to the Internet and can block unauthorized and unwanted users from accessing files and systems on the network. Hardware and software firewalls monitor and control the flow of data in and out of computers in both wired and wireless enterprise, business and home networks. They can be set to intercept, analyze and stop a wide range of Internet intruders and hackers. (See Intrusion detection). close

Security software designed to protect Web servers. They are used to protect sites from hackers and general unauthorized access.

Somply put, firewalls limit remote access to specific parts of the operating system or programs running on the system. They may block incoming data which attempts to connect to an application or exploit a vulnerability. Firewalls block many of the possible methods used to break into a computer without permission. It can help stop hackers, viruses, worms, and trojans. It may also block spyware from contacting the spying entity.

A set of security programs that protect a computer from outside interference or access via the Internet.

A computer firewall is used to protect a networked server or client machine from damage by unauthorized users. The firewall can be either hardware or software-based.

(1) Isolation of LAN segments from each other to protect data resources and help manage traffic. (2) Hardware or software that restricts traffic to a private network from an unsecured network.

A piece of security software designed to protect Web servers. They are typically used to protect sites from hacker attacks/unauthorized access.

Router that includes a filter so undesired content and undesired access can be blocked. Usually a firewall is positioned between closed environment (office for example) and an open environment (usually the Internet).

A combination of hardware and software that prevents unauthorized access to internal networks.

A network system tool used to filter out unwanted and potentially harmful data from being transferred between two computer networks.

A combination of hardware and software that separates a Local Area Network (LAN) in two or more parts for security purposes.

A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks. Basically, a firewall, working closely with a router program, filters all network packets to determine whether to forward them toward their destination. A firewall is often installed away from the rest of the network so that no incoming request can get directly at private network resources. There are a number of firewall screening methods. A simple one is to screen requests to make sure they come from acceptable (previously identified) domain names and IP addresses. For mobile users, firewalls allow remote access in to the private network by the use of secure logon procedures and authentication certificates.

A firewall is a security device that allows you to prevent unwanted accesses into, or out of, your network. A simple firewall can be built by installing firewall software on a computer linked to a network.

An Internet product that employs a combination of hardware and software to prevent unauthorized users or traffic from gaining access to a private local area network.

A filter for messages. A system that has a firewall lets only certain kinds of messages in and out from the rest of the Internet. If an organization wants to exchange mail with the Internet, but does not want other Internet members " telnetting in " and reading those files, its connection to the Internet can be protected using a firewall.

Software that sets up a security barrier round a corporate network or a standalone PC - becoming more common amongst home users

Software or hardware that protects a private network from the public. The purpose of a firewall is to keep unauthorized outsiders from tampering with a computer system, thereby increasing a server's security.

A system or combination of systems that enforce borders between two or more networks. A firewall regulates access between networks according to a specific security policy. It is almost like an invisible barrier that protects a network or computer. The technology is very similar to its real world equivalent. For example, the barrier between the passenger compartment and engine compartment in a car is known as a firewall. It is designed to allow communication such as the accelerator and brake pedals to travel to the engine but keeps fumes, heat and noise out of the passenger compartment.

A software and/or hardware firewall can shield your computer from unauthorised access and block unwanted Internet activity.

A firewall is a security program run on networks to block or limit undesirable internet traffic. Most Firewalls are set up between a bank of devices (several computers on a Local Area Network, for example) and the internet at large. If your PS2 is behind a firewall, and you have trouble hosting THPS3 games, then you may need to configure your firewall. Please see our Firewall section for more details.

An invisible boundary that distinguishes networked computers within that boundary from those outside it. Those within the firewall have internal access capabilities and share resources not granted to those outside it. A firewall protects one or more computers that have Internet connections from intrusion by external computers that also have connections.

A properly configured firewall helps protect your computer from hackers on the internet. Some routers come with built in firewalls, but we strongly recommend that if your computer is connected to the interent via an always on service such as broadband you should install a personal firewall on your computer. G, H, I, J, K

A firewall protects a computer network from unauthorized access. Firewalls may be hardware devices, software programs, or a combination of the two. A firewall typically guards an internal network against malicious access from the outside; however, firewalls may also be configured to limit access to the outside from internal users.

Special computers or computer programs that are set up on a network to prevent intruders from stealing or destroying confidential files.

Software that helps protect your computer from viruses and intruders. It creates a "wall" between your computer and the Internet.

A mechanism that isolates a network from the rest of the Internet, permitting only specific traffic to pass in and out. [San Diego State University

A method for keeping a network secure from intruders. Firewalls are widely used to give users secure access to the Internet.

A server or program designed to monitor and prevent data from being transferred across a network.

A system used to protect your computer from unauthorised access by third parties.

Software that monitors incoming and outgoing Internet traffic to your computer and checks for suspicious patterns. A firewall may alert you to spyware or a Trojan horse installed on your computer.

Program which limits access to internet and network ports to fend off unauthorized connections.

It is a means of controlling access through a public network to a private network.

Firewall refers to either software-only or separate software and hardware combination that serves to protect an internal network or a computer from attacks and unauthorized access by sitting between the Internet and the internal network.

a barrier between the outside world and your internal network. A firewall can be software or hardware built into various network equipment. It is used to filter network traffic and deny unauthorized network requests

any of a number of security schemes that prevent unauthorised users from gaining access to a computer network or that monitor transfers of information to and from the network

A firewall prevents unauthorised users from accessing your computer or network when connected to another network or to the Internet. It can be in the form of a program or hardware or a combination of both.

A security program or device that prevents other people from accessing your computer through the Internet without your permission.

A system between networks that filters data passing through it and removes unauthorized traffic, thus enhancing the networks security.

A system for preventing unauthorized users from accessing a private network. A firewall can be created using hardware or software, or a combination of both.

A security mechanism for filtering traffic between networks.

Firewall is a term used to describe software that is designed to protect computers from people that intend to do your computer harm.

A combination of hardware and software whose job is to cut a network into two or more parts. By doing this, it makes it more difficult for people (such as hackers) to gain access to the computers on the network. This is a basic form of network security.

Hardware and\or software which limits the exposure of a computer or group of computers to an attack from an external location. Routers and other internetworking devices use their access control capabilities to build firewalls that can, for example, keep fault from propagating throughout the entire internet.

A protective piece of software designed to make networking and the Internet safer to use. It blocks malignant access to your computer and can be used to stop inappropriate accessing of resources.

A program that helps to protect your computer from unauthorized connections to or from the 'outside world'. In this context, it protects you from programs that try to connect to the Internet without your knowledge or consent; similarly, it protects your computer from incoming requests for information (eg. a hacker trying to scan your computer).

In the corporate world, an electronic barrier between the company intranet and the world of the Internet. Used for security from hackers and viruses, and to aggravate the employees.

A computer connected both to the Internet and the local HIN that prevents the passing of Internet traffic, in the form of IP packets, to the internal hospital network. Provides an added layer of protection against 'hackers'. There are two kinds of firewalls: external, which protect all hospital systems form the outside world, and internal, which protect only selected systems. Firewall disadvantages: it restricts information transfer in both directions, and makes file transfer (ftp) and telnet (remote login) more difficult. See access control, encryption.

A security device that acts as a gateway between a closed system or network and the outside Internet. Firewalls manage communications into and out of a closed system with the use of passwords, authentication techniques, software, and hardware.

Hardware or software that functions to block access by applications or services to a computer or LAN from public network like the Internet except for applications that are allowed by the client (user).

If you want to protect any networked server from damage by those who log in to it, you put up a firewall. This could be a dedicated computer equipped with security measures such as a dial-back feature, or it could be software-based protection called defensive coding.

This is a protective item of software or hardware that makes it difficult for others to crack into your computer.

A security system designed to protect a computer network from unauthorised access, especially via the Internet.

Security system for protecting against illegal entry to a local area network which is connected to the Internet .

A collection of components placed between two networks in order to control network traffic and authorize defined network security policies. Firewalls are used to prevent unauthorized users from accessing private networks connected to the Internet. All messages entering or leaving the Intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

An electronic security system set up that prevents unauthorised users or unwanted material gaining entry to a private network

A system (or group of systems) designed to prevent unauthorized access between networks. In principle, the firewall can be thought of as a pair of mechanisms: one which blocks traffic, and the other which permits traffic. Users accessing the internet from campus or through a CIS modem are considered "inside" the firewall.

A firewall is a system designed to prevent unauthorized access to or from a private network, generally access from internet into a private network.

A combination of hardware and software that protects a LAN or a single server from break-ins via the Internet. Simple firewalls can be a router or computer that only allow certain types of network packets through ( IP filtering ). More advanced firewalls, application firewalls , have a higher degree of sophistication andcan be programmed to be even more restrictive by combing out a finer granularity of information in the network packet.

Your enterprise's demilitarized zone, consisting of hardware and software components; it enforces a boundary between two or more networks by limiting access in accordance with local security policy. A typical firewall is an inexpensive PC that is kept clean of critical data with many modems and public network ports on it, but just one carefully monitored connection back to the critical data it protects.

A software or device used to control and watch access to and from a network for the purpose of protecting it from hackers. It acts like a gateway through which all traffic to and from the protected network and/or systems passes, enforcing a security policy on all communication that takes place between the protected network and another network.

A firewall is a security device that separates two or more networks. It contains fine-grained rules on what types of traffic may pass between the networks and it often can analyze that traffic for known vulnerabilities. Any traffic that does not pass the firewall rules is thrown away and will not pass from one network to another. For more information, see: http://www.whatis.com/firewall.htm.

A computer or software used to keep unwanted computers out of a site, allowing authorized users/computers in only. Hackers can sometimes get through a firewall.

A firewall is a set of related programs located at a network gateway server that protects the resources of a private network from users from other networks. (The term also implies the security policy that is used with the programs.)

Software and/or hardware that is used to protect one or more computers connected to the Internet from hackers, and other unwanted intrusions. Can also be used to block traffic going to the outside network or filter restricted websites.

A security device to help prevent access by hackers.

Security Programmes providing a barrier between a private network and the Internet.

A network node set up as a boundary to prevent traffic on one segment from crossing over to another segment based on a set of administered rules. Firewalls are used to improve network traffic as well as for security purposes. A firewall may be implemented in a router or it may be a device specialized for such purposes.

A method of helping protect the files and programs on one network from users on another network. A firewall helps block unwanted access to a private network, while giving the private network access to networks outside of the firewall. A company will typically install a firewall to give users access to the Internet while helping protect their internal information. FrontPage allows users to author webs on the Internet even from within a private network.

Firewall refers to the concept of a security interface or gateway between a closed system or network and the outside Internet that blocks or manages communications in and out of the system. The security may be provided by passwords, authentication techniques, software, and hardware hacker Originally, a hacker was a term of respect among computer designers, programmers, and engineers for those among them who created truly original and ingenious programs, devices, or sometimes very clever practical jokes. Unfortunately, the current popular meaning of the term is to describe those who break into systems, destroy data, steal copyrighted software, and perform other destructive or illegal acts with computers and networks.

Software, hardware, or a combination of the two that prevents unrestricted access into or out of a network.

Piece of software or hardware that helps prevent hackers, viruses, and worms from reaching your computer over the Internet.

Software or hardware that limits certain kinds of access to a computer from a network or other outside source.

A network node set up as a boundary to prevent traffic from one segment to cross over into another.

Piece of software designed to shield your computer from unauthorised access from 3rd parties over the internet.

A technology to maintain the internal security of a computer system.

A set of related programs, located at a network gateway server, that protects the resources of a private network from users of other networks. A firewall, working closely with a router program, filters all network packets to determine whether to forward them toward their destination. A firewall also includes or works with a proxy server that makes network requests on behalf of workstation users. A firewall is often installed in a specially designated computer separate from the rest of the network so that no incoming request can get directly at private network resources. One firewall screening method involves screening requests to make sure they come from acceptable (previously identified) domain names and IP addresses. Firewall features include logging and reporting, automatic alarms at given thresholds of attack, and a graphical user interface for controlling the firewall.

A device that protects a private network from the public part. A computer set up to monitor traffic between an Internet site and the Internet. It's designed to keep unauthorized outsiders from tampering with a computer system therefore increasing a server's security.

A network configuration, usually both hardware and software, that forms a fortress between networked computers within an organization and those outside the organization. It is commonly used to protect information such as a network's e-mail and data files within a physical building or organization site. The area within the firewall is called the demilitarized zone, or DMZ. Often, a single machine in the DMZ is allowed access to both internal and external computers. The computer in the DMZ is directly interacting with the Internet, so strict security measures on it are required.

A Firewall is a system which limits network access between two or more networks. Normally, a Firewall is deployed between a trusted, protected private network and an untrusted public network. For example, the trusted network might be a corporate network and the public network might be the Internet. A Firewall might grant or revoke access based on user Authentication, source and destination network addresses, network protocol, time of day, network service or any combination of these. These settings are normally controlled by the Network Administrator.

a system or software utility designed to stop unauthorized access to a private network. Can also be used by a company to control what resources outside the network employees can access.

Software or hardware designed to prevent unauthorized access to or from a private network. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.

A program or set of programs designed to keep unauthorized users or messages from accessing a private network. The firewall usually has rules or protocols that authorize or prohibit outside users or messages. In email, a firewall can be designed so thast messages from domains or users listed as suspect because of spamming, hacking or forging will not be delivered.

Any device or software that isolates an organization's private network or intranet from the Internet, thus protecting it from external intrusions. A firewall can include packet filtering, proxy servers, and NAT (network address translation).

Hardware and/or software used to separate network into multiple segments for security purposes.

A computer program which filters transmissions, and helps protect your computer from invasion by a hacker.

A filtering module located on a gateway machine that examines all incoming and outgoing traffic to determine if it may be routed to its destination. WinRoute Lite is a simple Firewall based on Network Address Translation.

A system for preventing unauthorized users from gaining access to a local network. Firewalls may use hardware, software or a combination of both.

A security procedure that separates and protects data on a local network from being accessed from the Internet.

A combination of specialized hardware & software designed to keep unauthorized users from accessing information within a networked computer system.

Hardware and software designed to isolate an internal network from external networks and control how they communicate.

A firewall can be either hardware or software. The firewall helps prevent unauthorized users from accessing your files on your network.

A security system that blocks unauthorized access to a computer or network.

Filter that protects an intranet from outsiders and monitors what people inside a company can access.

A set of related programs, located at a network gateway server that protects the resources of a private network from users from other networks. An enterprise with an intranet that allows its workers access to the wider Internet, installs a firewall to prevent outsiders from accessing its own private data resources and for controlling what outside resources its own users have access to.

A combination of hardware and software, used to protect a network from unwelcome traffic. A firewall can be used to separate a LAN into two or more parts, or to control network traffic.

A piece of hardware or software (or a combination of both) designed to prevent unauthorized accessing of your computer.

protects any networked server or computer from outside interference. It may either be a piece of hardware or a software program that blocks outside connections to your machine. With more and more home computers permanently connected to the internet through cable and adsl, software firewalls are becoming increasingly popularized.

An access restriction that a system administrator puts into a server, usually for security purposes. System administrators can also create filters (sometimes called "bozo filters") that deny access privileges to certain users.

A firewall is a computer program that manages the connections between a company's internal computer network and its Internet connection. A firewall only allows specific types of data through and so protects the computer network from unwelcome visitors, hackers and viruses.

a device which protects internal systems from malicious activity originating on the Internet.

A protective barrier that prevents unwanted sources from accessing a computer or network.

A firewall is a hardware or software solution to enforce security policies. From a physical perspective, a firewall is equivalent to a lock on a door. It permits only authorized users such as those with a key or access card to enter. A firewall has built-in filters that block unauthorized or potentially dangerous material from entering the system.

A combination of hardware and software that is used to prevent unauthorized access to an internal computing system that belongs to a user who is accessing the Internet.

A gateway which protects an organisation's internal Local Area Network (LAN) from external access and tampering from a Wide Area Network (WAN), such as the Internet. Many firewalls disable the functionality of real-time audio and video players such as RealAudio.

Corporate software which provides a barrier between a company's internal network connections and the Internet itself. Firewalls keep out unauthorised intruders and can audit both incoming and outgoing Internet use. Additional servers may scan incoming messages or downloads for viruses or unsuitable material. They can also be used to block access to certain types of site.

A system designed to protect a computer network from unauthorized access, especially via the Internet. Both the House and Senate maintain strong firewalls to ensure that congressional data -- both on and off the Internet -- remains safe.

Hardware and/or software that separates a network into two or more parts for security purposes. The network behind the company's firewall is protected from unauthorized outside access.

A system designed to prevent unauthorized users from accessing information on a network. The system can involve software, hardware, or both. Firewalls are sometimes configured to block the types of services required to deliver a live web event to a person's computer, but this can be changed without a security risk if a company desires.

A logical or physical discontinuity in a network to prevent unauthorized access to data or resources. See also external firewall.

A set of security procedures that separates and protects data on a LAN from crackers who might access the LAN from the Internet.

A link in a network that relays only data packets clearly intended and authorized to reach the other side. Firewalls are helpful in keeping computers safe from intentional hacker attacks and from hardware failures occurring elsewhere. There are two types of firewalls: hardware and software. A hardware firewall might cost from $2,000 to $12,000, with higher-priced models appropriate for e-commerce Web hosts and financial institutions. A network software firewall program is probably adequate for a typical financial advisor.

A firewall is a system (software or hardware or both) used to prevent unauthorized access to a private network from the rest of the Internet.

A feature that protects a network connected to the Internet from being accessed by unauthorized users.

a security barrier placed between an organization's internal computer network and the Internet. A firewall is based on rules which allow and disallow traffic to pass, based on the level of security and filtering a network administrator wishes to employ.

1) a security mechanism that limits access by a public network (e.g., the Internet) to a private system or network. 2) a software component that limits access by a public network (e.g., the Internet) to a private system or network. 3) a network connectivity device that limits access by a public network (e.g., the Internet) to a private system or network.

A discontinuity in a network that prevents unauthorized access to data or resources.

combination of hardware and software that separates a LAN into two or more parts for security purposes; an application that acts as a boundary between networks to control access and improve the flow of network traffic

Hardware or software designed to filter online traffic. It uses security monitoring measures to ensure only authorized users are allowed to access systems and networks.

Means of protecting a computer system from unwanted access by outsiders. It can be a dedicated computer or set of programs on a computer.

A combination of hardware and software that protects a local area network (LAN) from Internet hackers. It separates the network into two or more parts and restricts outsiders to the area "outside" the firewall. Private or sensitive information is kept "inside" the firewall.

Any of a number of security schemes that prevent unauthorized users from gaining access to your computer or computer network, or using your computer to gain unauthorized access to the internet. A firewall can be a hardware device or a software program. A physical device is preferred because a software firewall can be shut down by unauthorized programs such as viruses, worms and trojans.

A firewall is a combination hardware and software buffer that many companies put in place between their internal networks and the Internet. A firewall allows only specific kinds of messages from the Internet to flow in and out of the internal network. This protects the internal network from intruders and/or prevents hackers from breaking into the systems.

A device that protects a private network against intrusion from nodes that are using the public network.

A system used to provide a controlled entry point to the internal network from the outside (usually the Internet). This is used to prevent outside or unauthorized systems from accessing systems on your internal network. The capability depends on the individual software package, but the features typically include: filter packets, filter datagrams, provide system (name or IP address) aliasing, and rejecting packets from certain IP addresses. It can also prevent internal systems from accessing the Internet on the outside. In theory, it provides protection from malicious programs or people on the outside. The name comes from the physical barrier between connected buildings or within a single building that is supposed to prevent fire from spreading from one to another.

A set of software and hardware systems that reside between an organization's internal network and the rest of the Internet. It is designed to prevent unauthorized access to the organization's network from unauthorized users.

Hardware and/or software designed to keep unauthorized outsiders from tampering with a computer system. That system may be a standalone computer, a small LAN or a company-wide network or WAN with thousands of users.

A system designed to prevent unauthorized access to or from a private network. (JCS 1997).

Software that turns off ports on a computer and filters the information going to and coming from the Internet.

A security system that prohibts unauthorized access to a network.

A system or combination of systems that enforces a boundary between two or more networks and keeps hackers out of private networks. Firewalls serve as virtual barriers so that the computers on your network cannot be accessed by outside computers. This is especially important when using a constant connection to the Internet, such as DSL.

A security system that protects the computer from outside access.

security measures designed to protect a networked system from unauthorized or unwelcome access.

A system that analyzes network traffic and blocks unwanted traffic from entering or leaving a network. Used at the border of a network to prevent people on the internet from accessing internal network services.

A system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented as hardware, software, or a combination of both. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the security criteria specified on the firewall.

Firewalls are software and hardware systems that define access between two networks, offering protection from outside data that could be harmful, such as a virus sent via the Internet.

Computer hardware and/or software that limits access to a computer over a network or from an outside source. Used to prevent computer hackers from getting into a company's computer systems.

A firewall is a software application designed to protect web servers. They are typically used to protect web servers from attacks or unauthorized access.

A system or combination of systems that enforces a boundary between two or more networks and keeps hackers out of private networks. Firewalls serve as virtual barriers to passing packets from one network to another.

A special computer that is set up on a network to prevent intruders from stealing or destroying confidential files.

A computer and/or program which controls access into a local network, allowing such access only to certain computers and users with particular designated characteristics.

A security device that restricts communications access. It allows you to decide which programs can send and receive data. Firewalls can be software or hardware.

A security plan intended to prevent unauthorized users from accessing a computer network.

A combination of specialised hardware and software designed to keep unauthorised users from accessing information within a networked computer system.

Hardware or software that allows or denies certain packets from entering or leaving a network or computer. Ideally a firewall would be placed between the Internet and the network connecting to it, so it can intercept all traffic trying to access the network. Working from a predefined list of rules, the firewall checks this list every time a packet is passed to it and then decides whether or not to allow the packet to be sent.

Software or hardware device that protects a computer or computer network against attacks from external sources (typically from the Internet).

software that sits between you and the outside world which refuses any incoming connections to a network unless you explicitly enable them. It is a means of implimenting security on computer network.

A security device that stands between a private network and the Internet. It is like a wall because it can prevent unwanted traffic from passing either way. Some firewalls have proxy functions built-in. In fact, the distinction between a firewall and a proxy is often blurry; the differences and similarities between a firewall and a packet-filtering router is confusing. True firewalls generally support packet-filtering, proprietary application filtering, and some proxy functions, combining the features of other devices or software into one unified package. SCW Consulting has extensive firewall experience with PIX Raptor and IAS, just to name a few. Our Network Consultants know how to setup your ACL to alow only the traffic you want through.

a program that helps protect your computer from other people gaining illegal access to it.

combination of computer hardware and software installed on a network to prevent access to specified network segments by unauthorized users.

A combination of specialized hardware and software set up to monitor traffic between an internal network and an external network (i.e. the Internet). Its primary purpose if for security and is designed to keep unauthorized outsiders from tampering with or accessing information on a networked computer system.

A device and/or software which separates a network into two or more segments for security, and controls what types of data are allowed to be transmitted between them.

Like a fence around a computer network, to keep it safe from other networks, viruses and hackers.

Any software program or hardware device designed to prevent computers on a network from communicating directly with external computer systems by filtering the information coming through the Internet connection into your private network or computer system . A Firewall keeps hackers out and personal data in by acting as a barrier through which all information passing between the network or computer and external systems must pass.

It is a device which act as a medium between your internal LAN and the internet.

a security device designed to prevent intruders from entering your network.

A system that prevents unauthorised access to a network. This can be used to prevent access to certain websites and/or access to your network from an external source.

Firewall is designed specifically to control access to your network.

A firewall prevents computers on a network from communicating directly with external computer systems. A firewall typically consists of a computer that acts as a barrier through which all information passing between the networks and the external systems must travel. The firewall software analyzes information passing between the two and rejects it if it does not conform to pre-configured rules.

A security barrier placed between an organization’s internal computer network, either its IS system or Intranet, and the internet. It keeps proprietary information in and blocks unwanted users.

Firewalls have nothing to do building code requirements or construction sites. Firewalls in Geek-Speak mean the creation of an impediment that blocks invasion of your computer system by outside forces. It functions as a protection against electronic terrorism, if you will. Computers can have hardware or software firewalls (or both). Generally, a hardware firewall offers more protection, but it also requires a more stationary installation, such as your home or office desktop. Laptops used in travel or from a variety of locations should have software firewall protection.

A secure gateway or virtual wall between two different computer networks that will prevent unauthorized use or access.

A network security device, which can be implemented either by hardware, software or both. It is designed to prevent unauthorized access to a network. The firewall sits between the network and the outside world, providing a single point where all inbound and outbound traffic passes. It closely monitors the traffic and blocks any suspect activity.

A hardware and software device that protects and controls the connection of one network to other networks. The firewall prevents unwanted or unauthorized traffic from entering a network and also allows only selected traffic to leave a network.

a security device used for routing information that can eliminate hackers and unwanted users.

In general, safety-related computer software that aims to prevent damage to the system; here especially software that controls the interfaces between a computer system and the Internet. Firewalls can become problematic when they deny access to necessary web content.

Computer hardware, software and physical measures which protect confidential information whilst it is on a web server; A type of gateway that protects private networks from eavesdropping, intrusion, and other attacks from the Internet by intercepting all traffic to and from the network. Return to the top

A security measure that protects networks from unauthorized access into the inner file system of a computer.

A set of related programs that protects a private network from intruders. Firewalls are typically installed along with router programs and keep outsiders from accessing information on an intranet. But it also typically is used to prevent users on an intranet from bringing in unwanted stuff from the Internet.

Hardware or software that helps keep hackers from using your computer to send out your personal information without your permission. Firewalls watch for outside attempts to access your system and block communications to and from sources you don't permit.

A security barrier erected between a public computer network like the Internet and a local private computer network.

Computer placed at the centre of a data network to prevent certain types of traffic. Would be used to implement port blocking (see below)

internet security to protect a LAN (Local Area Network) against hackers.

A software or hardware package that creates a boundary between your computer and the Internet. The capabilities of firewalls vary, but the most effective firewalls monitor and screen incoming and outgoing Internet traffic, track and repel potential security threats and prevent port scans by potential hackers. Many affordable firewall packages are available for the home user.

A secure gateway limiting access in and out of an internal computer network, such an Intranet. A combination of settings on communications hardware, and software on computer servers, denies access to unauthorised users.

A firewall is a combination of computer hardware and software used to keep a network secure.

a set of programs (which may run on a computer), a router, or a dedicated device, to protect the resources of a computer or network from other computers or networks, typically by filtering network packets.

A firewall is a small program that helps protect your computer and its contents from outsiders on the Internet or network. When installed, it prevents unauthorised traffic to and from your PC.

A network security system used to restrict external traffic.

A server designated as a buffer between any connected public network(s) and a private network. Firewalling is the practice of securing hosts from "evil doers" on the Internet.

A combination of hardware and software that secures access to and from the LAN . There are three main types of firewall architecture; Stateful Inspection, Proxy based and Packet Filtering, whereby the former provides the highest level of access control. Firewalls can also be used to secure internal network resources from internal network users too. See Also: Network, LAN To top

a series of network security measures that establish and monitor restricted access to a network of servers.

is a method for implementing security policies designed to keep a network secure from intruders. It can be a single router that filters out unwanted packets or may comprise a combination of routers and servers each performing some type of firewall processing.

Systems implemented in some smart cards to provide tight separation between various applications, or to prevent some applications (possibly uploaded) from accessing unauthorised data or parts of the code in the card's memory.

Software or hardware that is designed to prevent unauthorised access to a network. This can be either a piece of software or a standalone piece of equipment.

A firewall is point on the network topography, generally between two disparate networks, that enforces rules on what types of packets can pass thorough that point. In businesses firewalls are generally used to prevent unwanted traffic from coming into your private network, and to prevent information from leaving your network.

A method for providing Internet security in which computers located on a common Local Area Network all use one machine (or firewall) as a gateway to the Internet. Firewalls restrict the type of traffic flowing in and out from the local network to the Internet.

Prevents outsiders from gaining access to an intranet. It works by disabling part of the packet-switching activity of the Net.

A firewall is a system (either software or hardware based) that monitors your PC or network's Internet or other external traffic and decides whether it should be allowed through or blocked. The aim is to protect your computer or your entire network from hackers, viruses, trojans and related problems.

A security system designed to prevent unauthorised access to a computer network. Not only can it stop hackers getting in, it can also be used to restrict what you see on the internet and what kinds of files you receive.

A software utility and/or hardware device that limits outside network access to a computer or local network by blocking or restricting ports. Firewalls are commonly a great step for helping prevent un-authorized access to a company or home network.

Software and/or hardware used to protect a private network from unauthorized outside access.

A security barrier that separates a company's internal system from outside systems.

A software or hardware device used to separate one network from another. Frequently this is a company network from the internet. It is configured with a series of rules which dictate which computers can communicate with which networks and the ports that they can use for this. This is normally the boundary of a company network, although it is not unusual for them to be used inside networks now, to separate normal traffic from more secure data.

a combination of software and hardware that limits access to a WWW site and provides a degree of security

A program or dedicated computer which sits between you and the internet, preventing hackers, spammers and similar undesirables from taking over your PC. Absolutely essential if you have an always-on internet connection such as ADSL or cable.

Network security system used to restrict external and external traffic.

Also cognitive firewall. The hypothetical physiological mechanism through which brains are able to segregate inductive lessons into distinctive contexts. The capacity for brains to protect schema from overgeneralized learning.

A program which protects your broadband connection against hackers.

A protective barrier which provides security for confidential material. The information contained on the protective side of the firewall is only available to those who have been given prior electronic access.

a machine or a dedicated piece of hardware which, in the topology of a local network, is the unique connecting point to the outside network, and which filters, or controls the activity on some ports, or makes sure only some specific interfaces may have access to them.

A system designed to secure a network or PC from unauthorised access or threatening action from an external source, such as the Internet.

A system or combination of systems that enforces a boundary between two or more networks, and keeps unauthorized users out of private networks. A firewall system checks all incoming and outgoing messages to make sure they meet predetermined security criteria.

A method used to protect a private network from unwanted users. http://www.techweb.com/encyclepedia/defineterm?term=firewall

The firewall is a security device which helps prevent unauthorised computer users from accessing your LAN. By using password checks the firewall is useful for companies who feel that they might be a target for unauthorised users or who would like extra security added to their Internet connection.

Software that acts as a security filter that can restrict types of network communication. Most often used between a LAN and Internet.

A device used to keep uninvited guests from entering a private network. Because progressively downloaded videos are sent via the same method as Web content ( HTTP, FTP), they are less likely to be blocked by a firewall than a streaming broadcast.

Software or hardware designed to prevent computers on a network from communicating directly with external computer systems. A firewall acts as a barrier through which all information passing between the network or computer and external systems must travel. Firewalls analyze data and reject it if it does not conform to pre-configured rules.

Router or access server designated as a buffer between private and public networks

A security system that blocks the access of intruders to your private information residing on your system. A firewall can be a piece of hardware or software installed onto your system. The firewall uses rules to allow or block incoming and outgoing information. Each time you send or receive information through the Internet a packet is received. The firewall checks this packet against a set of rules or criteria. If this information does not meet these rules or criteria then it is blocked.

A hardware or software system that acts as a security device and limits access between two or more computer networks. A firewall is typically used to stop computer hackers getting into a company's computer system.

Software that prevents unauthorized access to a computer network.

A type of software that protects a computer from being accessed by others through the Internet. For broadband Internet connections, firewall software is a must-have.

A security barrier set up between a company's internal systems and outside systems. Firewalls keep hostile and unwanted visitors out of the company's internal information and can keep employees in, discouraging them from surfing the Web or playing games.

A security system imposed by a network to restrict outside traffic. A privacy and security wall separating your bank accounts, corporations, trusts from outside investigation.

Hardware or software that attempts to protect computers by preventing computers outside the firewall from starting connections with computers inside the firewall. Generally, your local network is inside, or behind, the firewall, whereas the rest of the Internet is outside the firewall. Firewalls only allow computers inside the firewall to start connections with outside computers.

A combination of hardware and software that provides a security system, usually to help prevent unauthorized access from outside to an internal network or intranet.

A combination of hardware and software that limits the exposure of a computer or a group of computers to an attack from outside. The most common use of a firewall is on a local area network connected to the Internet. Without a firewall, anyone using the Internet can gain access to a corporate local area network and steal information or "dump" false data onto a network.

Software which is installed onto home computers or servers that protects the network from unauthorised users (hackers)

A type of security program or system that acts as a protective boundary between your computer or a network of computers and the outside world. Firewalls can help protect data from attackers. ( Security.com)

an electronic boundary that prevents unauthorized users and/or packets of data or information (e.g., files and programs) from accessing a protected system.

A combination of hardware and software that keeps unauthorized users or intruders outside a network (LAN). Can also be configured to keep users on an internal network from browsing the Web.

A host that interfaces the outside world with the inside network and lets only some well-defined data through.

is a piece of software that regulates who can access a network from outside the network via a modem or computer.

A secured system passing and inspecting traffic via an internal trusted secure server network and an external secure server network that is untrusted, like the Internet. Firewalls can be used to discover, prevent, or mitigate certain kinds of secure server network attack. This provides Internet security and online security. See also application level gateway, proxy server.

A program or piece of hardware that allows certain kind of network traffic and disallows other depending on the policy set up by the administrator. A firewall can be set up in many ways, ranging from blocking external traffic to internal addresses (common in small to medium enterprises) to blocking everything both ways except the traffic passing through a Proxy server. A firewall usually includes NAT functionality as well.

A method of guarding a private network by analyzing the data leaving and entering. Firewalls can also provide network address translation, so the IP addresses of computers inside the firewall stay hidden from view. Packet-filtering firewalls use rules based on a packet's source, destination, port or other basic information to determine whether or not to allow it into the network. More advanced stateful packet filtering firewalls have access to more information from which to make their decisions. Proxy firewalls, which look at content and can involve authentication and encryption, can be more flexible and secure but also tend to be far slower. Although firewalls are difficult to configure correctly, security experts generally agree that they are a critical component of network security

A protective network wall that blocks access without authorization. This can work both ways: A firewall can keep network users in as well as other users out, or limit access on either side.

A system that prevents unauthorised access to a computer over a network, such as the internet.

A firewall isn't as exciting as the flaming pyrotechnics show the name suggests. A firewall is actually either a software program or hardware device which protects your computer from unauthorised access when it's online. It blocks out computer hackers and Internet worms (a special kind of virus which spreads between unprotected computers over the Internet). It's important to have a firewall, and some common ones include ZoneAlarm and Norton's Internet Security. Windows XP comes with an in-built firewall but you need to turn it on.

A special node in the network that can vet the messages that are being passed to ensure that only authorised users and approved traffic can use the network it protects.

A security device placed on a LAN (local area network) to protect it from Internet intruders. This can be a special kind of hardware router, a piece of software, or both.

A security system that prevents unauthorised users from accessing a private computer or network (or, in some cases, to stop users inside a network accessing specific sites outside the firewall). Firewalls can take the form of software (Windows XP now has one integrated, for example), or hardware (wireless routers typically have firewalls built-in).

A system to prevent unauthorized users from accessing private networks.

Security for a local network or Intranet. A combination of hardware and software designed to protect the computers on a network. Only certain information and messages are allowed in or out.

Gateway that limits access between networks in accordance with local security policy. [NS4009

A set of related hardware or software products and programs designed to prevent access to or from a private network (Intranet) by unauthorized users. There are numerous screening methods, including passwords and higher-level encryption. Most companies will use a combination of hardware and software solutions.

A firewall is a device that is put on a network between your company's "private" network and the public Internet. Firewalls have evolved very rapidly over the past 10 years, but their basic function is this: keep unwanted (potentially harmful) outside traffic from coming into your company's inside network where your sensitive information may be accessible.

Firewall refers to the concept of a security interface or gateway between a closed system or network and the outside Internet that blocks or manages communications in and out of the system. The security may be provided by passwords, authentication techniques, software, and hardware. See the related term proxy server. See our Security Guide for help in evaluating and managing the security of your own home or office system.

One of several types of intelligent devices (such as routers or gateways) used to isolate networks. Firewalls make it difficult for attackers to jump from network to network. A double firewall is two firewalls connected together. Double firewalls are used to minimize risk if one firewall gets compromised or provide address translation functions.

Hardware and software systems designed to create a security barrier between networks. These can be configured to allow decisions to be made on what can and can not be accessed. Used to detect and block illegal access attempts.

A security system intended to protect an organization's network against external threats, such as hackers, coming from another network, such as the Internet. A firewall prevents computers in the organization's network from communicating directly with computers external to the network and vice versa. Instead, all communication is routed through a proxy server outside of the organization's network, and the proxy server decides whether it is safe to let a particular message or file pass through to the organization's network.

An electronic boundary that limits access between networks that are linked together.

is a hardware and/or software systems that protects a computer network from external systems. The firewall monitors and blocks unauthorized attempts to access the internal network.

A software program that keeps unauthorized users out of a private network. Everything entering or leaving a system's internal network passes through the firewall and must meet the system's security standards in order to be transmitted. Often used to keep unauthorized people from using systems connected to the Internet.

A way to prevent unauthorized Internet users from accessing your network, by rejecting incoming requests to access an IP address. A hardware firewall is often built into a router. A software firewall does much the same thing on your PC. Some hardware and software firewalls prevent unauthorized outgoing data as well.

A software program or electronic device that protects a computer from Hacker attack. The Firewall monitors a computers Internet connection to scan for any secret activity going on in the background while you surf.

Computer hardware that prevents unauthorized access to private data (as on a company's local area network or intranet) by outside computer users on the Internet.

Software designed to shield your computer from unauthorised access by 3rd parties over a computer network.

A device or software designed to stop unauthorised people accessing a computer via the Internet without permission.

A system that actively protects a computer or network of computers from intrusion. Firewalls are available both as software programs and stand-alone devices. There are two basic categories of protection: Inbound - checks requests arriving from outside parties. Protects from port scanning, hacker attacks, and more. The basis of all firewalls. Outbound - checks transmissions being sent to outside parties. Protects from trojan horse programs. Available on some newer firewalls, including the excellent ZoneAlarm. Note that most routers are not firewalls because their protection is inactive. They do not perform packet-sniffing or any other type of security check; they simply ignore/discard unknown requests. This nevertheless provides a fairly good amount of protection.

Firewalls are security applications for networks. They operate in numerous ways: for a connection to the Internet they can monitor incoming and outgoing traffic to stop data from going to insecure locations, and hackers getting in. Most firewalls also allow the administrator to configure which websites can be accessed via the network, allowing questionable or insecure content to be blocked. All firewalls allow a full range of options to be configured by the administrator, such as closing network ports, only allowing certain types of outgoing connection etc. A good firewall is a must for any network.

A barrier between any connected public network and private network that prevents unauthorised traffic passing through it.

A network configuration, usually both hardware and software, that protects networked computers within an organization from outside access. Firewalls are commonly used to protect information such as a network's email and data files within a physical building or organization site.

A system or software utility designed to stop unauthoriused access to a private network and can be uused by a company to control what resources outside the network can be accesused by employees.

A computer or router that blocks certain types of network datagrams from passing between networks. One example of a firewall is a computer that routes data between a local area network and the Internet, but disallows certain types of direct access from the Internet to computers on the local area network. See also gateway.

A combination of hardware and software that separates a Network into two or more parts for security purposes. A firewall filters network traffic and only allows through legitimate traffic. Typically used to separate an internet connection from the rest of the network (even if it is just one PC). - View the Wikipeida full summary for Firewall

A piece of hardware or software that prevents unauthorised connections being made in a network environment.

A combination of hardware and software that protects a computer or group of computers from an attack by an outside network or computer user. A firewall enforces a boundary between two or more networks.

A means of protecting a computer system from unauthorized outside use.

hardware or software security device used to protect a network or server from unwanted external access.

A component or set of components that restricts access between a protected network and the Internet, or between other sets of networks.

The insulated wall that separates the engine from the interior of the car. It protects the driver and passengers from engine fires, noise, and fumes during accidents.

A network security tool designed to prevent unauthorized users from gaining access to network resources

A network note set up as a boundary to prevent traffic from one segment to cross over to another.

A security system for protecting a server and local area network. A firewall monitors and manages traffic in and out of a network while limiting access to authorized users and programs.

A combination of hardware and software that provides a security system to prevent unauthorised access to a computer from the Internet or network.

A set of software features that are intended to prevent unauthorized access to a computer. Firewalls are installed in local area networks to restrict access to private computer networks by screening incoming traffic and denying access to unauthorized users.

Authentication and access controls to protect areas of a computer file system against unwanted access by Internet users. Firewalls often prevent delivery of attachments to emails, which is why that technique is discouraged in emarketing programs.

A security solution which segregates one portion of a network from another portion, allowing only authorized network traffic to pass through according to traffic filtering rules.

A tool network administrators use to protect networks from outside contact or attacks. A firewall is a single source of entering or leaving a network and is usually protected by various security measures. This makes it easier to control who has access to what on the network.

A computer that connects a private network, such as a business, to a public network, such as the Internet. It contains programs that limit the access between two networks. See also proxy gateway.

A combination of hardware and software used on a Network for security purposes.

A combination of hardware and software that separates LAN (local area network) into two or more parts for security purposes.

A combination hardware and software buffer that many companies or organizations have in place between their internal networks and the Internet. A firewall allows only specific kinds of messages from the Internet to flow in and out of the internal network. This protects the internal network from intruders or hackers who might try to use the Internet to break into those systems.

A network security system that helps prevent unauthorized access and also prevents legitimate users accessing the Internet from the local network. A firewall usually consists of a single machine that's connected to the Internet and all Internet traffic must pass through that machine.

Secures a company or organisation's internal network from unauthorised external access (most commonly in the form of Internet hackers). A firewall in a network is a node set up as a barrier to prevent traffic crossing from one segment to another. Firewalls are used to improve network traffic as well as for security purposes, and may serve as a barrier between connected public and private networks. A firewall may be implemented in a router or it may be a network device specialized for this purpose.

"A system or group of systems that enforces an access control policy between networked computers."

A security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers.

A firewall is a piece of software or hardware that limits the connections that a computer or network will accept data from. This is used for security concerns.

An electronic boundary that prevents unauthorized users from accessing certain files on a network; or, a computer used to maintain such a boundary.

A barrier in a network that will only pass packets authorized to reach the other side.

Some businesses use a firewall, or security measure to protect their computer systems. A firewall can be a program or a computer, and it generally prevents unauthorized usage of the system. You may run into problems uploading or downloading from the Internet if you're using a connection through your workplace, for example, that runs through a firewall. You can generally contact the system administrator to find out more about how it works.

A system typically composed of both hardware and software that prevents unauthorized access to networks. If you are unable to access certain functions of WebCT or are unable to access WebCT at all from work a firewall may be the cause. You will need to contact the Network Administrator of your organization and see if he is willing to allow such access through the firewall.

1. One or more computer systems placed between trusted and non-trusted networks in order to prevent unauthorized access to networks and systems. 2. (IRM) A combination of hardware and software that separates a LAN into two or more parts for security purposes.

Security procedures and software that protect a LAN (local area network) or computer from hackers trying to gain access.

A firewall protects your network from malicious attacks targeting Broadband users. It prevents people from accessing your information and using your computer without your knowledge.

Software that protects an organisation's computer systems from problems such as viruses that can be carried by internet technologies or hackers seeking to gain unauthorised access.

A system designed to prevent unauthorized access to a private network. Firewalls can consist of both hardware and software. All messages passing through the firewall are examined to check that they meet specifications for accessibility.

Computer gateway (including hardware, software and procedures) that protects a company's computer network by filtering connections and transmissions between the local system and the Internet.

A combination of hardware and software that separates a LAN into two or more parts for security purposes. See network, and local-area network.

A hardware or software based system that filters network traffic based on a set of rules. Simple firewalls normally block access to specific ports.

A security system that prevents unauthorized access to or from all or part of a private network.

is a type of proxy server with additional features. Firewalls are usually placed between the users of a LAN and the Internet (some ISPs also use firewalls). The firewall can be set to screen for incoming viruses and only allow access to certain resources on the Internet as a security measure. It can also cache previously visited sites to avoid excessive use of bandwidth.

A device that protects the network from unwanted intruders and limits the traffic coming in and going out of the network.

A security setup that prevents unauthorised users gaining entry to a private network.

A specially programmed computer that connects networks (usually a local network to the Internet) and for security reasons lets only certain kinds of data in and out.

Security devices used to protect companies from unauthorized access to their servers. A firewall ensures that all communication between an organization's network and the Internet conform to the organization's security policies, using either proxy services or packet filtering.

A firewall helps protect your computer or home network against unwanted access and come in a variety of forms. They may be included with a hardware device such as a router or gateway be software programs that you load onto your PC, or be built into your computer's operating system.

Security software or appliance that sits between the Internet and your individual PC or networked device. Firewalls can intercept traffic before it reaches network routers and switches, or between router/switch and PC, or both. Because the job of firewalls is to prevent access from specific packets over specific network ports, some firewalls must be specially configured to allow VoIP traffic to pass through.

A hardware or software security device that controls access from the Internet to a computer or LAN to prevent hackers from disrupting service, damaging computer resources, or stealing data.

A piece of hardware or software which restricts access from a network (usually the internal network of a large company) and the general Internet.

Hardware and software combination that prevents access a LAN from outside

This software application is designed to prevent unauthorized access to a network. ()

A computer with a security system (like a trap door) that blocks access by computers outside the system ('behind' the firewall).

1. A wall that helps prevent fire spreading from one fire zone or area to another, and that runs from structural floor to structural ceiling. 2. One or more security mechanisms designed for access control and authentication to prevent, detect, suppress, and/or contain unauthorized access to a network. Firewalls are designed to keep unwanted and unauthorized traffic from a protected network.

Secure gateway or virtual wall between two different computer networks that prevents unauthorized use or access. A firewall is a security device (hardware or software) that controls access from the Internet to a local network by using identification information associated with TCP/IP packets to make a decision about whether to allow ore deny access. This decision is based on a set of defined rules that describe which packets or sessions are allowed.

A system has a firewall around it if it lets only certain kind of messages in and out from the rest of the Internet.

Related Terms: Intranet, corporate network, private network A device that separates a company or institutions private Intranet from the public Internet and only lets carefully selected data cross between the two.

In the context of computer security, a method of partially or totally blocking access (from machines not on the LAN) or of filtering/monitoring incoming packets.

Network device, which may be configured to limit unauthorised entry or use of a private network.

A combination of hardware and software used to separate a LAN into two separate parts for security reasons.

A combination of hardware and software that separates a network into two or more parts for security purposes, thus making it more complex for hackers and snoopers to interrogate.

A system, based on either hardware or software, used to govern traffic between two networks.

An application that isolates part of a network, like a company's private intranet, from access to or by other parts of the network, like the public Internet.

Hardware or software located on a network server that protects users on a private network from users on other networks. (Source: Dreamweaver MX 2004)

A security device (software or hardware based) that controls access from the Internet to a local computer or network. Not all firewalls are equal. Some employ more robust methods to insure security. Close Window

A security device typically deployed to prevent unauthorized external access to a network.

A security system that uses a proxy server outside of an organization's network to protect the network against external threats, such as from malicious users or corrupt files.

a computer security system used to restrict access to and from a network.

A firewall is a program, usually an internet gateway server, which protects the resources of one network from users from other networks.

A firewall is a crucial component in a computer's line of defense, as firewalls prevent unauthorized services or programs from accessing a computer or network resources. Although virtually every corporate network has its own firewall, every personal computer should have one as well. Personal firewalls can come as standalone products or as components built-in to a larger security suite.

software or hardware that prevents unauthorised access to a computer from the internet – hackers, viruses and other nuisances."

A networking device that blocks unauthorized access to all or parts of a network.

A system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or combination of both.

A set of programs installed on a gateway server, designed to protect the network's resources from users on other networks. A firewall filters and routes incoming traffic and makes outgoing requests (to the Internet, for example) on behalf of local workstations. See also Desktop Firewall.

A firewall consists of hardware and/or software that lies between two networks, such as an internal network and an Internet service provider. The firewall protects a network by blocking unwanted users from gaining access and by disallowing messages to specific recipients outside the network, such as competitors.

A security wall set up to protect the files and programs on one network from users on another network. A firewall blocks unwanted access to a protected network, while giving the protected network access to networks outside of the firewall.

A set of security programs that protect a computer from outside interference. Windows XP has a built-in firewall

A system designed to prevent unauthorized access to or from a private network. TransEdge SDSL routers come with firewall software that protect your network from outside attacks.

A piece of software (or hardware) that blocks unauthorized traffic between your computer and the Internet.

A security tool that blocks access from the Internet to files on a merchant's or third-party processor's server and is used to ensure the safety of sensitive cardholder data stored on a server.

A security measure to protect your computer or network from unauthorized or unwelcome access. Firewalls can be either software that runs on your computer, or hardware, either a stand–alone physical firewall, or sometimes they are built into modems/routers.

A system designed to prevent unauthorised access to or from a private network or computer.

A method of protecting one network from another network. A firewall blocks unwanted access to the protected network while giving the protected network access to networks outside of the firewall. A company will typically install a firewall to give users access to the Internet while protecting their internal information.

A security device situated between a private network and outside networks like the Internet. The firewall screens all information that attempts to enter or leave the private network, allowing or denying access or exchange based on pre-set access rules.

Hardware or software that protects your computer or network from being accessed by outside computers.

Systems designed to prevent unauthorized access to or from a private network. They are often used to prevent Internet users from accessing private networks connected to the Internet. A firewall has the following properties: all traffic between networks must flow through it, only authorized traffic is allowed to pass, and the firewall should be immune to compromise.

A firewall is any combination of hardware and software that creates a barrier between your computer and the Internet. Firewalls are designed to prevent outsiders from accessing your computer, and to prevent viruses and other destructive software from getting in. Corporations have used firewalls for many years. With the widespread use of DSL and cable modems, homes and small offices are using firewalls.

A combination of hardware and software that separates a LAN into two or more parts for security purposes. A firewall is commonly used to separate a network from the Internet. See Also: LAN, Network

A security barrier placed between an organization's internal computer network -- either its IS system or intranet -- and the internet. It keeps your information in, and unwanted people out. It consists of one or more routers which accept, reject or edit transmitted information and requests.

Either software or hardware whose purpose is to monitor communication channels (both incoming and outgoing), and possibly direct or block traffic if necessary. This is usually a network or computer's first line of defense.

A firewall allows only specific kinds of messages from the Internet to flow in and out of the internal network to protect the internal network or your PCfrom intruders.

A firewall is a piece of software that puts a barrier between your computer and the internet. It will prevent fraudsters from gaining access to your computer and must be updated regularly.

A type of security measure used to allow only specific kinds of messages from the Internet to get into company networks. It protects a company's system from hackers. Firewalls also prevent unauthorized access from a private network.

A security mechanism that protects a computer or network from unauthorised access.

A security system that not only prevents intruders from entering, but also often prevents legitimate users from getting out to the Internet from the local network. A firewall usually has a single machine that's connected to the Internet and all Internet traffic must pass through that machine.

Router or access server, or several routers or access servers, designated as a buffer between any connected public networks and a private network. A firewall router uses access lists and other methods to ensure the security of the private network.

a software or hardware device that protects servers from unauthorized access, usually by blocking ports.

Gatekeeper hardware or software that guards against unauthorised access to your computer via the Internet by hackers.

A hardware and software system that protects a network from exposure to and unauthorized access from outside attacks seeking to capture or infect it, such as viruses and hackers.

A device that can be programmed to allow or not allow data traffic to move in and out of a private network. It can either be software or hardware. For many businesses a software only solution is not recommended.

Many networks now have firewalls to protect internal data from internal and external hazards. In order to videoconference over an IP network with a firewall, ports are assigned to handle the video. H.323 specifies the dynamic ports within a specific range.

A piece of software or hardware designed to keep out intruders in computer systems. Flash – A program designed to make web animations.

network program that blocks malevolent traffic that might endanger the computers on your network.

A Firewall is a combination of software and hardware that maintains a boundary between two or more networks that prevents unauthorized access to a private network.

A device that can filter data passing through it based on definable rules, typically the primary defense mechanism of a network.

A software or hardware/software combination that protects the perimeter of a network against unauthorized access to that network.

A firewall is a software or hardware device that prevents outsiders from accessing a computer or network.

A Firewall is a device that inspects traffic between the Internet a private network or computer system. Suspicious packets or traffic are dropped by the firewall and are prevented from entering or leaving the network.

Any device or software that protects an organization's private network or intranet from intrusion by external networks such as the Internet.

A logical barrier between an internal network and an external network, such as the Internet. A firewall consists of one or more hardware and software systems. It controls the access and flow of information between trusted systems and untrusted systems. Firewalls come in several varieties, including Application Gateway (Proxy), Transparent Gateway (Socks), Packet Filtering (screening routers), Network Address Translation, and IP Tunnels (VPN).

a security system to protect a networked server or computer from intentional or accidental damage or unauthorized access; implemented by either hardware (a dedicated gateway machine) or software (defensive coding).

A combination of hardware and software which limits the exposure of a computer or group of computers to an attack from an outside network. A firewall is a system or combination of systems that enforce a boundary between two or more networks.

A security barrier erected between an organization's internal network and a public computer network such as the Internet.

This is a piece of network security equipment that connects between your network and the Internet. It blocks certain data from being transferred between the two.

Hardware or software that secures computer files by blocking unauthorized access.

A security hardware and software combination that limits access to the internal local area network (LAN). A firewall might also restrict access to the Internet from within the LAN.

originally an architectural barrier to prevent the spread of a fire, such as a fire door; here, the electronic equivalent: a computer or software program designed to protect a network from unauthorized access by blocking or filtering out certain kinds of data traffic

A device placed on a network to prevent unauthorized traffic from entering the network.

the use of computer hardware and software to block access between an internal network and the rest of the Internet. A firewall, for example, protects your computer and its information from unauthorised access by hackers or vandals who wish to steal information or damage your computer system.

A method for keeping a network secure. It is a combination of technologies sometimes implemented in a single device that allows users in a local network (e.g. small office) to access files on the outside network (e.g. the Internet), but does not allow users in the outside network to access files on the inside network.

Can be hardware or software based. Firewalls are used on networks to prevent unauthorized users from 'hacking' into the network and accessing sensitive, personal data and information.

Software and/or hardware that limits outside network access to a computer or network. Firewalls are one method helping to prevent unauthorized access to a company or home network.

Specialized hardware or software designed to secure a computer or network from unauthorized access.

A computer system that is used to prevent users on the Internet from getting unauthorised access to a LAN.

A security device or system, usually a combination of hardware and software meant to protect a local network from intruders from the Internet.

A method of preventing unauthorized access to or from a particular network; firewalls can be implemented in both hardware and software, or both.

A security system where incoming and outgoing internet traffic is stopped, examined, and then distributed or turned away.

A computer system that screens data passing between network segments, used to provide security for a private network at the point of connection to the Internet.

Either hardware or software that protects a network from outside intrusion.

A security system designed to restrict access to computers on a Local Area Network (LAN) from the outside world, which usually means the Internet. Gateway This is a device that passes data between two different systems on a network. This includes supporting voice communication between terminals on a packet, e.g., Internet Protocol (IP) network and terminals on a circuit (e.g., Public Switched Telephone Network (PSTN). Gigabit Ethernet (GIG-E) The newest version of Ethernet, which supports data transfer rates of one gigabit (1,000 megabits) per second. Host Any device that is accessible on a network. Internet Control Message Protocol (ICMP) The Internet Control Message Protocol (ICMP) is part of the Internet protocol suite. ICMP messages are typically generated in response to errors in IP datagrams or for diagnostic or routing purposes.

A system or combination of systems that enforces a boundary between two or more networks, i.e., an electronic gate that limits access between networks in accordance with local security policy.

A server-based software program that restricts access from the Internet into a server and its network or Intranet.

A computer that protects a company's private network from outside Internet users.

A combination of software and hardware which, for security purposes, separates a LAN into two or more parts, or partially isolates a network from the Internet.

A program that helps protect your computer or computer system from unauthorised access.

A security system put in place by some organisations to protect a network from outside access. Many trust networks have firewalls.

Software and/or hardware that filters activity and protects data on a network.

A firewall is software and/or hardware that is used to prevent unauthorised access to a computer and/or network.

A set of security devices and application that effectively filter and block external access to an organisation’s internal data network. The establishment of firewalls is necessary for banks to ensure the integrity of transaction data held on the bank’s systems. A firewall can also be used to block users from an intranet from accessing public Internet.

A combination of hardware and software that separates a LAN into two or more parts for security purposes. Often used to separate an in-house LAN from the Internet.

A firewall is a special type of program that acts as a protective wall between an internal network and the Internet. It is designed to protect the internal network of computers from hackers who could damage important data such as company files.

A means by which unauthorised users are prevented from interfering with a computer or network. This may take the form of only allowing connections from known IP addresses.

means of protecting networked computers from unauthorized access.

Security scheme designed to keep a computer network safe from unauthorized usage.

A hardware/software element that protects the internal environment from outside threats. Firewalls inspect incoming connections and decide which to allow. They also control external access to remote sites.

A computer with special software that functions as a security barrier for an internal network. It separates computers in a local area network (LAN) from computers outside the network (e.g. Internet users). This prevents outside users from accessing confidential information on computers within the network.

Firewall Prevents unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both.

Computer security that attempts to keep crackers out.

a security system designed to keep unauthorized individuals from gaining access to a private network. A firewall may be deployed in either software or hardware or both concurrently. One of the functions of a firewall is to effectively screen all incoming and outgoing messages.

A computer system that sits between the Internet and a company's network. It acts as an active gateway to keep non-company entities from accessing company confidential data.

A router, or pair of routers, between the Internet and a private network to prevent unauthorised access.

A firewall is hardware and/or software that is designed to protect your computer or network from unauthorized access attempts. Firewalls regulate your computer's or network's communications with the Internet at large in order to prevent damage from malicious users or code.

A term for any device that would prevent undesirables on the global Internet from getting at your or your company's network. It also often prevents or controls users from getting out to the Internet from your local network. Next Column Continue ~ E-Mail Us: [email protected] Date Modified: Tuesday, July 03, 2001 Copyright© 1998 WebShed.Com

Firewalls are used to create a protective barrier for the internal network (LAN) against the external one (WAN, Internet) which monitors packets traveling in and out of the network. Usually located at the network's gateway.

A specially programmed computer that connects a local network to the Internet and for security reasons only allows certain types of messages through.

Software or hardware components that restrict access between a protected network and the Internet, or between other sets of networks, to block unwanted use or abuse.

A security device that stands between a private network and the Internet. It is like a wall in that it can prevent unwanted traffic from passing either way. Some firewalls have proxy functions built-in. In fact, the distinction between a firewall and a proxy is often blurry. Add in the differences and similarities between a firewall and a packet-filtering router and you've got one big ball of confusion. True firewalls generally support packet-filtering, proprietary application filtering, and some proxy functions, combining the features of other devices or software into one unified package.

gateway that filters traffic passing through it to provide security. The firewall can deter hackers on the Internet from damaging or accessing computers on networks "behind" the firewall.

A specifically programmed computer system that ‘stands' between an organisation's LAN and the Internet. It is a security measure used by many companies to prevent hackers and other unauthorised users from accessing internal networks. The firewall computer is set up to monitor traffic and to keep unauthorised ‘crackers' from tampering with the system, thereby protecting a private network from a public network. Firewalls are also set up to protect the security of servers.

A firewall is a networking device that controls access to the network assets of your organization. Firewalls are positioned at the entrance points into your network. If your network has multiple entrance points, you must position a firewall at each point to provide effective network access control. The most basic function of a firewall is to monitor and filter traffic. Firewalls can be simple or elaborate, depending on your network requirements. Simple firewalls are usually easier to configure and manage. However, you might require the flexibility of a more elaborate firewall.

A system or machine that controls the access between outside networks and private networks.

A firewall helps protect your computer and its contents from outsiders on the Internet or network by stopping unauthorised traffic to and from your PC. Common examples are from Zone Labs, Symantec (Norton), McAfee and Computer Associates. In many cases there is a version of commercial software that is free of charge for personal users. For more information visit our Personal firewalls section.

Security system consisting of hardware and/or software that prevents unauthorized access to data and information on a network. 9.20, 9.29, 12.24 network, 12.25 personal, 12.5, 12.23, 12.25

A part of a computer system or network that is designed to block unauthorised access while permitting legitimate outward communication. Firewalls are typically either hardware or software depending on the rigidity and data storage requirement.

A network component set up to prevent unauthorized network traffic form one side of the device from crossing to the other side while passing authorized traffic.

Firewall is a network security product (or suite of products) that acts as a barrier between two or more networks.

A computer which acts as a shield between you and other computers on the Internet as a security measures.

A specially programmed computer that connects a local network to the Internet and, for security reasons, lets only certain kinds of messages in and out. A security device that places a protective "wall" around a computer or network of computers, keeping it from being accessible to the public.

A hardware and software combination that is used to prevent outsiders from tampering with the internal computer system of an Internet user. The firewall acts as a gateway, monitoring traffic between an Internet site and the Internet, ferreting out and blocking unauthorized access.

A programmable system that stops ‘nerds from damaging your site whilst they are visiting it. Prevents ‘flaming'. Its purpose is to prevent un-authorised access into the company from outsiders. Firewalls are essential for all companies hosting their own web server.

used in networking to prevent unauthorized users on the Internet from reaching the files and programs on the local area network.

A combination of hardware and software that protects the perimeter between the public and private network against certain attacks to ensure some degree of security.

Secures a PC from external access, notably from hackers.

A system composed of both hardware and software that enforces access control between two networks, usually between a private Local Area Network and the public Internet.

Protects your PC by filtering and blocking unsolicited Internet connections and prevents attacks from hackers.

A firewall is used to separate a local network from the outside world. In general a local network is connected to the outside world by a "gateway" computer. This gateway machine can be converted into a firewall by installing special software that does not let unauthorized TCP/IP packets pass from inside to outside and vice versa. You can give users on the local network, and "inside" the firewall, access to the outside world using the SOCKS package or by installing the a proxy server on the firewall machine.

A set of programs the act to protect a private network. A common method is to screen the IP address of an incoming request and check it against an acceptable database of IP addresses.

A firewall is a system designed to regulate access between networks and enforce an organisation's security policy. It is usually a combination of hardware and software. A firewall simplifies the management of network security by providing a single point of access to the network. The firewall examines all data and blocks data that does not meet specified security criteria.

Security gateway positioned between two different networks, usually between a trusted network and the Internet. A firewall ensures that all traffic that crosses it conforms to the organization's security policy. Firewalls track and control communications, deciding whether to pass, reject, discard, encrypt, or log them. Firewalls also can be used to secure sensitive portions of a local network.

a hardware or software device that controls what traffic comes in and out of a network or computer. It can protect networks and computers from intrusion and worms.

A firewall is an information technology (IT) security device which is configured to permit, deny or proxy data connections set and configured by the organization's security policy. Firewalls can either be hardware and/or software based.

Fire-resistant bulkhead seperating powerplant from rest of aircraft

The slab of steel separating the driver cockpit from the engine compartment.

The front former (bulkhead) of the fuselage behind the engine. The engine is usually attached to the firewall. Report this Word Added by: fritzke

The bulkhead between the engine and the passenger compartment.

A strong bulkhead immediately behind the engine on a powered aeroplane.

A solid metal plate that separates the engine compartment from the driver's compartment of the racecar.

A solid metal plate that separates the engine compartment from the driver's compartment of a race car.

A steel plate that separates the engine compartment from the driverâ€(tm)s compartment.

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