Describe the functions of LCP and NCP.
Link Control Protocol (LCP) layer
- Sits on top of the physical layer and has a role in establishing, configuring, and testing the data-link connection.
- Establishes the point-to-point link.
- Provides automatic configuration of the interfaces at each end. This includes handling varying limits on packet size, detecting common misconfiguration errors, terminating the link, and determining when a link is functioning properly or when it is failing.
- Is also used to negotiate authentication, compression, error detection, multilink, and PPP callback after the link is established.
- Negotiates and sets up control options on the WAN data link, which are handled by the NCPs.
Network Control Protocol (NCP) layer
- Includes functional fields containing standardized codes to indicate the network layer protocol that PPP encapsulates.
- Handles the assignment and management of IP addresses in IPCP.
- Encapsulates and negotiates options for multiple network layer protocols.
Exam with this question: EWAN v4 Chapter 2 Check Your Understanding: PPP
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