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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

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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

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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