Which PPP subprotocol negotiates authentication options?

A.
NCP

B.
ISDN

C.
SLIP

D.
LCP

E.
DLCI

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.