which command is used to enable CHAP authentication whit PAP as the fallback method on a serialinterface？（）
- A、（config-if）#authentication ppp chap fallback ppp
- B、（config-if）#authentication ppp chap pap
- C、（config-if）#ppp authentication chap pap
- D、（config-if）#ppp authentication chap fallback ppp
正确答案:C
答案解析:有
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