单项选择题

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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单项选择题

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

单项选择题

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

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

单项选择题

The following configuration line was added to router R1
Access-list 101 permit ip 10.25.30.00.0.0.255 any
What is the effect of this access list configuration？（）

A.ermit all packets matching the first three octets of the source address to all destinations
B.permit all packet matching the last octet of the destination address and accept all source addresses
C.permit all packet matching the host bits in the source address to all destinations
D.permit all packet from the third subnet of the network address to all destinations