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!
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。
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。
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