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單項選擇題

Refer to the exibit. Three cisco 2950 switches are set to their default priority settings.During the spanning-tree process，which switch will be elected as the root bridge？（）

A.Switch3
B.Switch4
C.Switch2
D.Switch1

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單項選擇題

What speeds must be disabled in a mixed 802.11b/g WLAN to allow only 802.11g clients to connect?（）

A.6，9，12，18
B.1，2，5.5，6
C.5.5，6，9，11
D.1，2，5.5，11

單項選擇題

Which port state is introduced by Rapid-PVST?（）

A.learning
B.listening
C.discarding
D.forwarding