單項(xiàng)選擇題

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

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