Three switches are connected to one anther via trunk ports．Assuming the default switch configuration,which switch is elected as the root bridge for the spanning-tree instance of vlan 1?
A、
the switch with the lowest MAC address
B、
the switch with the higest MAC address
C、
the switch witch the higest IP address
D、
the switch with the lowest IP address
【正确答案】
A
【答案解析】
在运行STP协议的网络中选择根桥需要利用桥ID．
桥ID由桥优先级（所有思科交换机上默认优先级为32768）和MAC地址组合来决定的。
在网络中，桥ID最小的网桥成为根桥。
桥ID=桥优先级+桥mac 越小越优先
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