Refer to the exhibit.A problem with network connectivity has been observed.It is suspected that the cable connected to switch port Fa0/9 on Switch 1 disconnected.What would be an effect of tis cable being disconnected?
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【正确答案】 1、B    
【答案解析】图中交换机存在环路,有一个端口会处于堵塞状态。当F0/9 down之后,STP重新计算,在汇聚之前VLAN3不能访问VLAN9,端口汇聚之后恢复正常。
D说hostB访问VLAN 9中的server会变慢。不同vlan之间的通信需要通过网关转发,并不是switch1直接转发给switch3,所以这里访问速度不会变。