Connections using point-to-point protocol authenticate using which of the following? (Select TWO).

A.
RIPEMD

B.
PAP

C.
CHAP

D.
RC4

E.
Kerberos

Explanation:
B: A password authentication protocol (PAP) is an authentication protocol that uses a password. PAP is
used by Point to Point Protocol to validate users before allowing them access to server resources.
C: CHAP is an authentication scheme used by Point to Point Protocol (PPP) servers to validate the identity
of remote clients. CHAP periodically verifies the identity of the client by using a three-way handshake.
Incorrect Answers:
A: RIPEMD (RACE Integrity Primitives Evaluation Message Digest) is a family of cryptographic hash
functions. RIPEMD is not used for point-to-point protocol authentication.
D: RC4 is not used for point-to-point protocol authentication.
RC4 (Rivest Cipher 4) is the most widely used software stream cipher and is used in popular Internet
protocols such as Transport Layer Security (TLS).
E: Kerberos is primarily at aimed a client–server model, not at point-to-point connections, and it provides
mutual authentication—both the user and the server verify each other’s identity. It works on the basis of
‘tickets’ to allow nodes communicating over a non-secure network to prove their identity to one another
in a secure manner.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 139, 147-148, 251, 255