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- 多项选择题	如图,每个交换机都配置了主机名,也都运行了RSTP,在就没有做其他的配置了。下面哪三个选项正确的描述了RSTP的端口角色?() 
- A、SwitchA上,Fa0/2,指定 
- B、SwitchA上,Fa0/1,根 
- C、SwitchB上,GI0/2,根 
- D、SwitchB上,GI0/1,指定 
- E、SwitchC上,Fa0/2,根 
- F、SwitchD上,GI0/2,根 
- A,B,F
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