what function does ncp perform in the establishment of a ppp session?
+ Network control Protocol (NCP): negotiate optional configuration parameters and facilitate for the Network Layer (OSI Layer 3). In other words, it makes sure IP and other protocols can operate correctly on PPP link. Establish a PPP session. Before a PPP connection is established, the link must go through three phases of session establishment: 1. Link establishment phase: In this phase, each PPP device sends LCP packets to configure and test the data link 2. Authentication phase (optional): If authentication is enabled, either PAP or CHAP will be used. PAP and CHAP are two authentication protocols used in PPP 3.