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．
【正确答案】
C
【答案解析】
PVST+允许每一个vlan有自己的跟桥
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