Refer to the exhibit. What switch proves the spanning-tree designated port role for the network segment that services the printe

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问题 Refer to the exhibit. What switch proves 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 题目求哪一个交换机为打印机提供指定端口?
由图可知S1是根桥。指定端口是基于网段间选举的。
S3--S4之间S3的BID比S4小,所以S3-S4之间的指定端口在S3上。
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