單項選擇題

Refer to the exhibit. At the end of an RSTP election process, which access layer switch port will assume the discarding role?（）

A.Switch3, port fa0/1
B.Switch3, port fa0/12
C.Switch4, port fa0/11
D.Switch4, port fa0/2
E.Switch3, port Gi0/1
F.Switch3, port Gi0/2


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1.多項選擇題Refer to the exhibit. The output that is shown is generated at a switch. Which three of these statements are true? （）

A.All ports will be in a state of discarding, learning, or forwarding.
B.Thirty VLANs have been configured on this switch.
C.The bridge priority is lower than the default value for spanning tree.
D.All interfaces that are shown are on shared media.
E.All designated ports are in a forwarding state.
F.The switch must be the root bridge for all VLANs on this switch.

2.多項選擇題Which three of these statements regarding 802.1Q trunking are correct? （）

A.802.1Q native VLAN frames are untagged by default.
B.802.1Q trunking ports can also be secure ports.
C.802.1Q trunks can use 10 Mb/s Ethernet interfaces.
D.802.1Q trunks require full-duplex, point-to-point connectivity.
E.802.1Q trunks should have native VLANs that are the same at both ends.

4.多項選擇題Which are valid modes for a switch port used as a VLAN trunk? （）

A.transparent
B.auto
C.on
D.desirable

5.單項選擇題What is one benefit of PVST+?（）

A.PVST+reduces the CPU cycles for all the switches in the network
B.PVST+automatically selects the root bridge location,to provide optimized bandwidth usage.
C.PVST+allow the root switch location to be optimized per vlan.
D.PVST+supports Layer 3 load balancing without loops.