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计算机
Refer to the exhibit. Which switch provides the spanning-tree designated port role for the network segment that services the pri
Refer to the exhibit. Which switch provides the spanning-tree designated port role for the network segment that services the pri
admin
2019-04-08
47
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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