Refer to the exhibit． Which switch provides the spanning-tree designated port role for the network segment that services the pri

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问题 Refer to the exhibit． Which switch provides the spanning-tree designated port role for the network segment that services the printers?

选项 A、Switch1
B、Switch2
C、Switch3
D、Switch4

答案C

解析这是个关于生成树选举的问题，我们首先需要找到根桥，而根桥的选举是通过比较桥ID的,而且是越小越优先，桥ID的组成为桥优先级和MAC地址。所以我们通过上图可以找到根桥为switch 1。然后在非根桥上选出根端口，通过比较到根桥的花费来选举的，花费最小的就是根端口。因为上图中没有表示出链路的带宽，所以无法比较他们的花费。下一步我们来选举指派端口。每条链路都需要有一个DP，先是比较花费，如果花费相同则比较BID（桥优先级），仍是越小越优先，根据上图的表识，我们可以找到每条链路上的DP，而连Printers的链路上的DP就为Switch 3，因为他有更小的MAC地址。

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