Multiple choice

What PPP protocol provides dynamic addressing, authentication, and multilink?

  1. HDLC

  2. LCP

  3. NCP

  4. X.25
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

LCP (Link Control Protocol) is the correct PPP protocol that establishes, configures, maintains, and terminates the link connection. LCP handles authentication (via PAP or CHAP), negotiates parameters like MRU and magic number, and supports multilink PPP. NCP (Network Control Protocol) handles network layer protocol configuration like IP assignment, but LCP is responsible for the broader link management functions listed. HDLC is a proprietary Cisco protocol, not PPP, and X.25 is an older WAN protocol.

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