单选题Spaning Tree协议（）。A被交换机来实现虚网划分B被路由器来划分子网C被路由器来克服报文包循环D被交换机来克服报文包循环
单选题
Spaning Tree协议（）。
A
被交换机来实现虚网划分
B
被路由器来划分子网
C
被路由器来克服报文包循环
D
被交换机来克服报文包循环
参考解析
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