The PPP is used to establish point-to-point links for systems transporting multi-protocol datagrams. It is an amalgam of several sub-protocols.
Part of the protocol is an LCP or link control protocol for establishing, configuring and testing the data-link connection, as well as other network control protocols. Amongst other uses, one of the LCP's jobs is to agree encapsulation format options.
A background to the intellectual development and design criteria behind the PPP can be analysed in RFC 1547 (put together by Drew Perkins of Carnegie Mellon in December 1993, who also founded Infinera) entitled "Requirements for an Internet Standard Point-to-Point". In it he highlights that while many protocols then existed for the data-link layer, none were sufficiently complete and versatile enough to be accepted as an Internet Standard.
Part of the protocol is an LCP or link control protocol for establishing, configuring and testing the data-link connection, as well as other network control protocols. Amongst other uses, one of the LCP's jobs is to agree encapsulation format options.
A background to the intellectual development and design criteria behind the PPP can be analysed in RFC 1547 (put together by Drew Perkins of Carnegie Mellon in December 1993, who also founded Infinera) entitled "Requirements for an Internet Standard Point-to-Point". In it he highlights that while many protocols then existed for the data-link layer, none were sufficiently complete and versatile enough to be accepted as an Internet Standard.
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