provides the negotiation mechanism. Each LCP packet is encapsulated in the payload fieldof PPP frame
and a value 0xC021 (hexadecimal) is placed in the protocol field of PPP frame to indicate that PPP is
carrying an LCP frame (Figure 7.10).
FlagAddressControl0xC021PayloadFCSFlag
InformationLengthIDCodeLCP packet
Figure 7.10 LCP Packet Encapsulated into PPP Frame
The frame structure of LCP consists of various subfields, which are described as follows
Code: It is a one-byte long field that defines the type of LCP packet. There are 11 types of LCP
packets that are divided into three categories. ...
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