Often used in a security context, in which no information is compromised, but no one can get any work done, either. For example, a denial of service attack on a telephone system might involve large-scale destruction of cables or switching gear.

Action or actions which prevent any part of a TAIS from functioning according to its intended purpose.

(DoS) A type of attack on a network that is designed to bring the network to its knees by flooding it with useless traffic. Many DoS attacks, such as the Ping of Death and Teardrop attacks, exploit limitations in the TCP/IP protocols. For all known DoS attacks, there are software fixes that system administrators can install to limit the damage caused by the attacks. But, like viruses, new DoS attacks are constantly being dreamed up by hackers.

During a denial of service attack, computers (usually web servers) are flooded with targeted and/or numerous hits. They are then no longer able to function and crash.

The process by which legitimate users, customers, clients or other computers are prevented from accessing resources on a computer by an unauthorised party. This is usually accomplished by overwhelming a computer with bogus requests, or by tampering with legitimate requests.

A prevention of the use of information resources either intentionally or unintentionally, which affects the availability of the information resources. Examples of such attacks are SYN flood, Ping O death and Ping flooding.

1) A form of attack that reduces the availability of a resource. Result of any action or series of actions that prevent any part of an IS from providing data or other services to authorized users.

A denial of service occurs when a virus infects a computer, server or network to the point that it consumes system resources and disallows normal operation and access into it. These attacks are typically designed to shutdown or disable access into an entire network.

Action(s) which prevent any part of an AIS from functioning in accordance with its intended purpose.

A condition in which users are deliberately prevented from using network resources.

(Acronym – DoS) An attack technique that consumes all of a web site's available resources with the intent of rendering legitimate use impossible. Resources include CPU time, memory utilization, bandwidth, disk space, etc. When any of these resources reach full capacity, the system will normally be inaccessible to normal user activity. See also " Abuse of Functionality".

an action that occurs when a computer that is inefected with the virus is taken over by someone other than the normal user

A means of attack against a computer, server or network; the result of the attack is to disable or shutdown the system or network.

An attempt to deny a legitimate user the use of the computer. This is done by exploiting a computer's weakness (which is usually fixed when discovered). Types of attacks include disabling ports, flooding a network connection, and filling a disk with useless information.

A type of attack that can disable computers or networks and prevent legitimate users from using specific computer or network services. Denial of service attacks can flood a computer or network with data (consuming resources), disrupt connections between machines, etc.

Denial of Service (DoS) refers to a type of attack that exploits the need to have a service available. It is a growing trend on the Internet because Web sites in general are open doors ready for abuse.

A Denial of Service (DoS) attack, is an Internet attack against a Web site whereby a client is denied the level of service expected. In a mild case, the impact can be unexpectedly poor performance. In the worst case, the server can become so overloaded as to cause a crash of the system.

an attack that causes the targeted system to be unable to fulfill its intended function

A Denial-of-Service attack is when computers on the Internet are bombarded with (garbage) messages to such a great extent that they spend all of their time responding to these messages. Real user traffic can no longer get through.

Result of any action or series of actions that prevents any part of a telecommunications or AIS from functioning.

Denial of Service or DOS attacks are usually directed at specific commercial web sites. Microsoft.com has been a target recently. Often using Trojan Horses which have been placed in computers around the world, the attack consists of directing millions of queries at the web servers being attacked. The attacks have the immediate goal of preventing others from accessing the servers. At times Denial of Service attacks will cause web servers to crash, disabling web sites.

An attack on a network designed to render it - or an Internet resource - unavailable. The target may be an organisation's e-mail services or its website.

Denial of Service is the result of an attack by a computer or series of computers on a network, device (such as a firewall) or computer. Personal computers infected with specific Trojans can be used to mount Denial of Service Attacks on other networks or computers, these malicious attacks can be used to extort money from the affected network or computer owners. During an attack, legitimate traffic, such as email can not get through.

An attack characterized by an attempt to overwhelm a server. E-mail servers are often targeted with floods of messages with the intention of causing the servers to crash, thereby denying e-mail services to the organization.

When legitimate users are denied access (service) to their computer or network. One way it can occur is when an attack on a computer or network causes so much data flow that it prevents anyone else from gaining access to the system.

(DoS) Also known as a Distributed Denial of Service (DDoS) attack. This is an attack on a computer, server, website or network, where large amounts of data are sent to the computer under attack in an effort to diluge or saturate the network, using all bandwidth, in order to "shut it down" or in other words, make it inaccessible to anyone else. The name Denial of Service comes from the fact that if this attack is successful, legitimate users will get a "denial of service". The data that is used to attack a server usually comes in the form of TCP/IP or UDP packets, sent from hundreds of remotely-controlled computers, often through the use of a trojan.

the degree to which a software system or component prevents the interference or disruption of system services to the user.

A denial of service attack is when an attacker consumes the resources on your computer for things it was not intended to be doing, thus preventing normal use of your network resources for legimite purposes.

A denial-of-service attack (abbreviated DoS attack) is an attack against the availability of a computer system, network or service, which interferes with its operation, attempting to make it unavailable. A DoS attack can be launched in a number of ways, though it is generally limited to one of four types: consumption or overload of system or network resources, such as bandwidth, disk space, or Central Processing Unit (CPU) time disruption of configuration information, such as routing information disruption of physical network components disruption of the operation of a key service through the use of a software vulnerability or a bug in the operating system Information on reporting a Denial of Service attack. Source: Wikipedia.org - Denial of Service attack

Preventing authorized users from accessing a computer system by consuming system resources with unauthorized traffic.

A means of attack against a computer, server or network; the attack is either an intentional or an accidental by-product of instruction code, which is either launched from a separate network or Internet connected system, or directly at the host. The attack is designed to disable or shutdown the target of the attack.

When action(s) result in the inability to communicate and/or the inability of an AIS or any essential part to perform its designated mission, either by loss or degradation of a signal or operational capability (JCS 1997). detectable actions. Physical actions or whatever can be heard, observed, imaged, or detected by human senses, or by active and/or passive technical sensors, including emissions that can be intercepted.

Result of any action or series of actions that prevents any part of an information system from functioning.

This is a type of network attack that attempts to render a network or Internet resource useless to users. It may be e-mail services, or it could be access to a particular website. The methods of attack vary, but the end result is that a resource is unavailable.

When a network is flooded with traffic through any of a variety of methods, the systems cannot respond normally, so service is curtailed or denied. This is a favorite technique of network saboteurs.

A type of network attack that attempts to render a network or Internet resource useless to users, typically by sending large amounts of repeated requests for data. The target may be e-mail services, an IRC server, or access to a particular website. The methods of attack vary, but the end result is that a resource is artificially slowed down or unavailable to legitimate users. A common attack type used by hackers today. SCW's consultants know how to prevent and stop this type of attack. Just contact our security consulting team and they can help.

An attack specifically designed to prevent the normal functioning of a system and thereby to prevent lawful access to the system by authorized users. Hackers can cause denial of service attacks by destroying or modifying data or by overloading the system's servers until service to authorized users is delayed or prevented. See Also: Attack

In this type of attack, users or organizations are deprived of the services that should be normally available. As a result of these attacks, users or organizations might lose network connectivity, or e-mail services. A denial of service attack can also damage files on affected computers. Although these type of attacks are usually malicious, they can also happen accidentally.

This form of attack uses unwanted or malicious traffic that renders network resources unavailable or non-functional.

When a hacker floods an organisation's online business with false or fraudulent traffic with the intent of causing the website/portal to fall over.

An attack that consumes the resources on your computer for things it was not intended to be doing, thus preventing normal use of your network resources for legitimate purposes.

A popular method of malicious attack used by hackers to disable a Web site by flooding it with requests for service from many different computers at the same time without the computer users knowledge. This overwhelms the targeted server and makes it impossible for those actually trying to access the site to do so. Close Window

On the Internet, a denial of service (DoS) attack is an incident in which a user or organization is deprived of the services of a resource they would normally expect to have. Typically, the loss of service is the inability of a particular network service, such as e-mail, to be available or the temporary loss of all network connectivity and services. In the worst cases, for example, a Web site accessed by millions of people can occasionally be forced to temporarily cease operation. A denial of service attack can also destroy programming and files in a computer system. Although usually intentional and malicious, a denial of service attack can sometimes happen accidentally. A denial of service attack is a type of security breach to a computer system that does not usually result in the theft of information or other security loss. However, these attacks can cost the target person or company a great deal of time and money.

(Context: computer security) A specialized type of attack in which system resources are used at such a rate that they are denied to other users.

The prevention of authorized access to a system resource or the delaying of system operations and functions.

An internet based attack where remote computers are seriously hampered by requesting information faster than the server can respond to the request.

The prevention of authorized access to resources or the delaying of time-critical operations. Refers to the inability of a MIS system or any essential part to perform its designated mission, either by loss of, or degradation of operational capability.