* No retransmission mechanism, Low network overhead, Fast speed. * Provide authentication protocol CHAP（ Challenge Handshake Authentication ）,PAP（ Password authentication protocol ）, It is mainly used for network security authentication, Better ensure the security of the network. ） It is mainly used to negotiate the format and type of data packets transmitted on the data link, Better support for network layer protocols. * provide LCP, Used to build, Demolition and monitoring PPP data link. * PPP Good expansibility, for example, When it needs to be carried on the Ethernet link PPP Time ,PPP Can be extended to PPPOE. But now PPP Basically, they operate on the synchronous link, Clock synchronization is enabled by default. PPP It supports both synchronous and asynchronous links, and X.25,FR And other data link layer protocols only support synchronous links ,SLIP Only asynchronous links are supported. Now let's explain it in small points PPP What are the advantages over other link layer protocols ：
Can achieve PPPOE,PPPOA And other businesses, And it can also be used with special line network, Realize the communication between enterprise headquarters and branches DDN Network docking. In general, user authentication can be provided, Easy to expand, And support the same / asynchronous communication, Therefore, activities are widely used.
WHICH ADDRESS IS USED IN THE ADDRESS FIELD OF A PPP FRAME SERIAL
PPP It is a link layer protocol that carries network layer data packets on point-to-point links, As in the router Serial The default protocol of the interface link is PPP, Of course you can PPP More than that Serial This is a port, Other examples Dialer, Virtual template interface can run （ Mainly in PPPOE Application in ）.
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