Question:
Which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?
- (config-if)#authentication ppp chap fallback ppp
- (config-if)#authentication ppp chap pap
- (config-if)#ppp authentication chap pap
- (config-if)#ppp authentication chap fallback ppp
Explanation: The command “ppp authentication chap pap” command indicates the CHAP authentication is used first. If it fails or is rejected by other side then uses PAP instead. If you want to use PAP first (then CHAP) you can use the “ppp authentication pap chap” command.
Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps
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