Which PPP subprotocol negotiates authentication options?
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A. B. C. D. E.Explanation
The correct answer is B. LCP (Link Control Protocol).
PPP (Point-to-Point Protocol) is a data link layer protocol commonly used to establish a direct connection between two network nodes. PPP can operate over various physical media, including serial links, T1/E1 lines, and ISDN connections. PPP defines a set of protocols that are used to establish, configure, and test the data link connection between two nodes.
LCP (Link Control Protocol) is one of the PPP protocols. LCP is responsible for establishing, configuring, and testing the data link connection between two nodes. LCP is used to negotiate options such as authentication, compression, and error detection.
When a PPP connection is established, the LCP protocol begins by sending a series of LCP packets between the two nodes. These packets are used to negotiate the options for the data link connection. One of the options that can be negotiated is authentication. The authentication options that can be negotiated include PAP (Password Authentication Protocol) and CHAP (Challenge Handshake Authentication Protocol).
Therefore, the correct answer is B. LCP, as it is the PPP subprotocol responsible for negotiating options such as authentication.