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Which command will display the CHAP authentication process as it occurs between two routers in the network?

  • A.show chap authentication
  • B.show interface serial 0
  • C.debug ppp authentication
  • D.debug chap authentication

Answer: C

Correct answer: debug ppp authentication

CHAP is an authentication method within PPP, so the debug that shows the exchange - the challenge, the response and the success or failure - is debug ppp authentication. There is no debug chap command, and show interface serial 0 reports the line and protocol state without showing the negotiation that produced it.

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