Summary
PPP is used for encapsulation, link negotiation, and network protocol negotiation for network protocol packets that are sent over a point-to-point link. The PPP connection process has four phases: link negotiation, authentication, callback negotiation, and network protocol negotiation. During link negotiation, each PPP peer determines how it will send PPP frames. During authentication, PPP authentication protocols such as MS-CHAP v2 or EAP-TLS are used to verify the credentials of the calling or answering PPP peer. During callback negotiation, the calling and answering PPP peers determine whether the answering PPP peer will call the calling peer back and at which phone number. During network protocol negotiation, NCPs such as IPCP, CCP, ...
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