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单项选择题which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?()

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

  • C
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