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單項(xiàng)選擇題Which command displays the CHAP authentication process as it occurs between two routers?（）

A.debug authentication
B.debug chap ppp
C.debug chap authentication
D.debug ppp authentication

1.單項(xiàng)選擇題Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet？（）

A.802.3ad
B.802.1w
C.802.1Q
D.802.1d

2.單項(xiàng)選擇題At which layer of the OSI model dose PPP perform?（）

A.Layer 3
B.Layer 4
C.Layer 2
D.Layer 5

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