Which PPP subprotocol negotiates authentication options?

Which PPP subprotocol negotiates authentication options?
A . NCP
B . ISDN
C . SLIP
D . LCP
E . DLCI

Answer: D

Explanation:

A protocol that establishes, configures, and tests data link connections used by the PPP Link Control Protocol offers PPP encapsulation different options, including the following:

Authentication – options includes PAP and CHAP Compression – Data compression increases the throughput on a network link, by reducing the amount of data that must be transmitted. Error Detection -Quality and Magic numbers are used by PPP to ensure a reliable, loop-free data link.

Multilink – Supported in IOS 11.1 and later, multilink is supported on PPP links between Cisco routers. This splits the load for PPP over two or more parallel circuits and is called a bundle.