Discussion
What protocol does PPP use to identify the Network layer protocol?
Answer: A
Correct answer: NCP
PPP has two sublayers above the physical link. LCP establishes, configures and tests the connection itself, handling authentication, compression, multilink and error detection. NCP then negotiates one control protocol per network layer protocol carried - IPCP for IP, IPXCP for IPX - which is how PPP supports several protocols over one link. HDLC is a different encapsulation altogether, and ISDN is a physical service.
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