Which command displays the CHAP authentication process as it occurs between two routers?

The correct answer is D. debug ppp authentication. The correct command to observe the CHAP (or PAP) authentication process on a Cisco router is (D) 'debug ppp authentication'. CHAP is a sub-protocol of PPP (Point-to-Point Protocol), so its authentication exchange is debugged through the PPP debug hierarchy. This command…

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Question

Which command displays the CHAP authentication process as it occurs between two routers?

Options

Adebug chap authentication
Bdebug authentication
Cdebug chap ppp
Ddebug ppp authentication

How the community answered

(48 responses)

A
4% (2)
B
2% (1)
D
94% (45)

Explanation

The correct command to observe the CHAP (or PAP) authentication process on a Cisco router is (D) 'debug ppp authentication'. CHAP is a sub-protocol of PPP (Point-to-Point Protocol), so its authentication exchange is debugged through the PPP debug hierarchy. This command displays the three-way CHAP handshake in real time: the challenge sent, the response received, and whether authentication succeeded or failed. The other options are not valid Cisco IOS commands - 'debug chap authentication' (A), 'debug authentication' (B), and 'debug chap ppp' (C) are not recognized commands in IOS. Always use 'undebug all' or 'no debug all' after troubleshooting to stop debug output.

Topics

#debug ppp authentication#CHAP debugging#PPP troubleshooting#authentication verification

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