An Internet protocol, at Layer 2 relative to the OSI reference model, for serial lines such as telephone circuits or RS-232 cables that interconnect two systems. IP is one level above SLIP. SLIP is now being replaced by PPP. See PPP, and Internet.

A method of Internet access that enables your computer to dial up a service provider and exchange info reliably. see also SLIP.

A well-established Internet communications protocol that standardizes dial-up networking.