Practice Quiz

CompTIA Network+ Exam Review

Category - Networking

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David has configured his company’s ISDN link to use CHAP authentication. It worked well for a couple of weeks. However of late, the line drops very quickly after it comes up. David wants to check what the error could be. He decides to debug the CHAP process. Which command should he use?
  1. debug chap authentication
  2. debug ppp authentication
  3. debug ppp chap
  4. debug chap encryption
Explanation
Answer - B - To debug the CHAP process, David should use the debug ppp authentication command.

Key Takeaway: Whenever you want to troubleshoot an issue related to CHAP authentication, you must use a debug command. The show commands do not show anything in real time; hence, the debug command should be used. The debug PPP authentication displays the authentication process of a PPP line, including the CHAP process. This can be used to gain some insight on the problem.
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