Cisco Certified Network Associate (CCNA) Practice Exam

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Which troubleshooting step checks for PPP CHAP issues?

Verify IP connectivity
Check link-state advertisements
Ensure PPP CHAP is operational
Confirm ACL configurations

The correct answer is: Ensure PPP CHAP is operational

The choice that checks for PPP CHAP issues focuses on ensuring that the PPP (Point-to-Point Protocol) Challenge Handshake Authentication Protocol is functioning correctly. CHAP is an authentication scheme used to periodically verify the identity of a peer, which is crucial for maintaining a secure connection over a link. By specifically checking that PPP CHAP is operational, you are directly addressing potential authentication failures that can occur due to incorrect configurations, expired credentials, or other issues related to the CHAP mechanism. Inspecting other options could lead you to gather useful information, but they do not specifically target known problems with CHAP authentication. For instance, verifying IP connectivity helps to confirm that devices can reach each other, which is beneficial, but it won’t identify issues tied to authentication failures. Meanwhile, checking link-state advertisements relates more to OSPF (Open Shortest Path First) and wouldn’t reveal anything about PPP CHAP. Lastly, confirming ACL (Access Control List) configurations can ensure that traffic is not being inadvertently blocked or allowed, but that too does not address the authentication process used in PPP. Thus, focusing on the operational status of PPP CHAP directly addresses any immediate issues with authentication on the link.