Connections using point-to-point protocol authenticate using which of the following? (Select TWO).
Correct Answer: B,C
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.
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