CCNA考题Refer to the exhibit.which switch provides the spannin

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CCNA考题
Refer to the exhibit.which switch provides the spanning-tree designated port role for the network segment that services the printers?
A.switch1
B.switch2
C.switch3
D.switch4
答案是A，哪位大神能帮我解释下为什么选A？跪谢了！

题目翻译过来好像是：如图所示，哪个交换机提供了生成树的指定端口在网络中为打印机服务？
首先确定根桥，选根桥先看priority，小的优先，直接可以确定根桥是SW1。
然后画出生成树，给printer提供服务的是3、4中的一个，再次比较，Sw3和SW4的priority是一样的，那么比较MAC，小的优先，那么就是SW3提供了指定端口。
我检查了一下我的题库，找到了这道题，答案是C，不是A。

英语翻译QUESTION 123Refer to the exhibit.Switch port FastEtherne CCNA题库解析 Refer to the exhibit.Assume that all of the router CCNA 里的一道题Refer to the exhibit. A network administrator is a Refer to the exhibit. Which three&n 323.Refer to the exhibit.An organization connects two locati 316.Refer to the exhibit.Given the output from the show ip e 英语翻译refer to the exhibit .what type of layer 2 encapsulation 英语翻译Refer to the graphic.Switch 2 has computers attached tha the switch to sth. 英语翻译1.Match the definitions to the terms which refer to the 英语翻译1.We are not conscious of the content to which provides take the switch to sb.