Huawei Certified Network Associate – Routing and Switching (HCNA-RS, legacy) — Question 158

Two routers are connected via serial interfaces, for which the link-protocol is PPP. The network administrator wishes to configure PPP authentication to improve security on this link.
Which PPP authentication method provides a more secure solution?

Answer options

• A. CHAP
• B. PAP
• C. MD5
• D. SSH

Correct answer: A

Explanation

CHAP (Challenge Handshake Authentication Protocol) is considered more secure than PAP (Password Authentication Protocol) because it uses a challenge-response mechanism that doesn't transmit passwords in clear text. MD5 is a hashing algorithm and not an authentication method, while SSH (Secure Shell) is a protocol for secure remote login, not specifically for PPP authentication.