Point-to-point protocol (PPP) provides a standard method for the transmission of multi-protocol self-addressed data packets based on point-to-point connections. PPP was originally designed to provide a package protocol for transmission between the IP traffic between two peers. In the TCP-IP protocol, it is a data link layer protocol on synchronous modulation connections (second layer in OSI mode), which replaces the original non-standard second layer protocol, ie SLIP. In addition to IP, PPP can also transmit other protocols, including DECNET and Novell Internet Pack Switch (IPX).
PPP is mainly composed of the following parts:
Package: a method of encapsulating multi-protocol datagram. The PPP package provides different network layer protocols while passing through a unified link. (People) Carefully Design PPP packages to keep it compatible with common support hardware. Link Control Protocol: In order to use enough convenience in a very wide environment, PPP provides LCP. The LCP is used to automatically reach the same, and process the size of the package, detect looped-back links and other common configuration errors, and terminating links. Other optional devices provided are: authentication of peer-to-peer unit identifiers in the link, and decisions in the link function or link failure. Network Control Protocol: An Extension Link Control Protocol for establishing, configuring, testing, and managing data link connections. Configuration: The PPP link is easy to configure through the link control protocol. This mechanism is also applied to other control protocols such as network control protocols (NCP)
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