2. 计算机
  3. Refer to the exhibit． When PC1 sends an ARP request for the MAC address of PC2, network performance slows dramatically, and the

Refer to the exhibit． When PC1 sends an ARP request for the MAC address of PC2, network performance slows dramatically, and the

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问题 Refer to the exhibit． When PC1 sends an ARP request for the MAC address of PC2, network performance slows dramatically, and the switches detect an unusually high number of broadcast frames． What is the most likely cause of this?
选项 A、The portfast feature is not enabled on all switch ports．
B、The PCs are in two different VLANs．
C、Spanning Tree Protocol is not running on the switches．
D、PC2 is down and is not able to respond to the request．
E、The VTP versions running on the two switches do not match．
答案C
解析 PC1发出一个ARP request的数据报，并且是以广播的形式发送出去的。当ARP报文传到switch 2，交换机对广播的流量是以泛洪的形式处理的，报文就从除了连接PC1的接口外的所有接口都发出去了。Switch1收到广播后也泛洪，因此一个广播环路就产生了，所以在感觉网络性能很差，因为广播的流量占有了很大的带宽。而我们阻断二层环路是通过生成树来实现的，在图中有环路存在因此就说明没有运行生成树了。
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