Which PPP subprotocol negotiates authentication options?
A. NCP B. ISDN C. SLIP D. LCP E. DLCI
Correct Answer: D
Explanation:
The PPP Link Control Protocol (LCP) is documented in RFC 1661. LPC negotiates link and PPP parameters to dynamically configure the data link layer of a PPP connection.
Common LCP options include the PPP MRU, the authentication protocol, compression of PPP header fields, callback, and multilink options.