Point-to-Point Protocol

Point-to-Point Protocol (PPP) is a Data Link layer protocol that can be used over either asynchronous serial (dial-up) or synchronous serial media. It uses the Link Control Protocol (LCP) to build and maintain data link connections. Network Control Protocol (NCP) is used to allow multiple Network layer protocols (routed protocols) to be used on a point-to-point connection.

Since HDLC is the default serial encapsulation on Cisco serial links and it works great, when would you choose to use PPP? The basic purpose of PPP is to transport layer 3 packets across a Data Link layer point-to-point link. It is nonproprietary, which means that if you don't have all Cisco routers, PPP would be needed on your serial interfaces—the ...

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