PPP Framework

In computing, the Point-to-Point Protocol, or PPP, is commonly used to establish a direct connection between two nodes. It can connect computers using serial cable, phone line, trunk line, cellular telephone, specialized radio links, or fiber optic links. Most Internet service providers use PPP for customers' dial-up access to the Internet. An encapsulated form of PPP, called Point-to-Point Protocol over Ethernet (PPPoE), is commonly used in a similar role with Digital Subscriber Line (DSL) Internet service.

PPP is commonly used to act as a data link layer (layer two of the OSI model) protocol for connection over synchronous and asynchronous circuits, where it has largely superseded the older, non-standard Serial Line Internet Protocol (SLIP), and telephone company mandated standards (such as Link Access Protocol, Balanced (LAPB) in the X.25 protocol suite). PPP was designed to work with numerous network layer protocols, including Internet Protocol (IP), Novell's Internetwork Packet Exchange (IPX), and AppleTalk.

Basic Features
PPP was designed somewhat after the original HDLC specifications. The designers of PPP included many additional features that had been seen only in various proprietary data-link protocols up to that time.

PPP is described by Internet Engineering Task Force (IETF) RFC 1661.

PPP Framework

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