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.