Question:
Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?
- Router(config-if)# ppp authentication chap fallback ppp
- Router(config-if)# ppp authentication chap pap
- Router(config-if)# authentication ppp chap fallback ppp
- Router(config-if)# authentication ppp chap pap
Explanation: This command tells the router to first use CHAP and then go to PAP if CHAP isn’t available.
Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps
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