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PPP (Point-to-Point Protocol) is a protocol used for transmitting data over point-to-point links. PPP is widely used in dial-up connections, DSL, VPN and other scenarios, supporting the encapsulation and transmission of various network layer protocols (such as IP, IPX). * * * ### How PPP Works PPP establishes connections between two devices through point-to-point links, and supports authentication, data encapsulation, and error detection. ### 1. **PPP Connection Establishment** The PPP connection establishment process includes the following steps: !(#) 1. **LCP (Link Control Protocol) Negotiation**: * Device A and Device B negotiate link parameters (such