单项选择题

How many broadcast domains are shown in the graphic assuming only the default vlan is configured on the switches?（）

A.one
B.six
C.twelve
D.two

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多项选择题

Which are valid modes for a switch port used as a VLAN trunk? （）

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

单项选择题

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.

单项选择题

Refer to the exhibit. What switch proves the spanning-tree designated port role for the network segment that services the printers?（）

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