Spanning-tree生成树协议不清楚！求助！！

a0002liu

43. Refer to the exhibit. Each of these four switches has been configured with a hostname, as well as

being configured to run RSTP. No other configuration changes have been made. Which three of these

show the correct RSTP port roles for the indicated switches and interfaces? (Choose three.)

file:///C:/Users/LIUXIAO/AppData/Local/Temp/ksohtml/wps_clip_image-23968.png

A. SwitchA, Fa0/2, designated

B. SwitchA, Fa0/1, root

C. SwitchB, Gi0/2, root

D. SwitchB, Gi0/1, designated

E. SwitchC, Fa0/2, root

F. SwitchD,Gi0/2, root

Answer: ABF

哪位达人给我解答下这道题啊？我知道根交换机的选举过程，但是根端口和指定端口的选举过程很不清楚，经常搞混，只知道跟交换机上的端口全是指定端口。但是不知道为什么。。。求助各位大侠的详解，小弟先行谢过了~

274440934

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a0002liu

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严重谢谢

henrry

conducive  reveal