Refer to the exhibit． Which statement is true?
[*]
A、
The Fa0/11 role confirms that SwitchA is the root bridge for VLAN 20．
B、
VLAN 20 is running the Per VLAN Spanning Tree Protocol．
C、
The MAC address of the root bridge is 0017．596d．1580．
D、
SwitchA is not the root bridge, because not all of the interface roles are designated．
【正确答案】
D
【答案解析】
stp对于跟桥所有的接口都是指定端口
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