Which of the following is not a way that clients can authenticate to servers in a client\server model?

A.
Password Authentication Protocol (PAP)

B.
Challenge Handshake Authentication Protocol (CHAP)

C.
Extensible Authentication Protocol (EAP)

D.
MS-Password Authentication Protocol (MS-PAP)

Explanation:
Depending upon the protocol, there are different ways to authenticate auser in this client/server architecture. The traditional authentication protocolsare Password Authentication Protocol (PAP), Challenge Handshake AuthenticationProtocol (CHAP), and a newer method referred to as Extensible Authentication Protocol (EAP).