如图所示网络结构，当Swith1和Swith2都采用默认配置，那么PC2和PC4之间不能通信，其最可能的原因是（ ）。如果要解决此问题，最快捷的解决方法是（ ）。
问题1选项
A.PC2和PC4的IP地址被交换机禁止通过
B.PC2和PC4的VLAN被交换机禁止通过
C.PC2和PC4的MAC地址被交换机禁止通过
D.PC2和PC4的接入端口被交换机配置为down
问题2选项
A.把Switch1和Switch2连接端口配置为trunk模式
B.把Switch1和Switch2连接端口配置为access模式
C.把Switch1和Switch2设置配置为服务器模式
D.把Switch1和Switch2设置配置为客户端模式
正确答案及解析
正确答案
解析
参考答案：B、A
本题考查VLAN通信的相关知识。
交换机默认情况下所有端口都属于VLAN1，当VLAN2的主机跨交换机通信时，交换机之间的链路由于都属于VLAN1，所以无法跨越交换机通信。这时应该将交换机间的链路配置为trunk链路，以便相同VLAN的数据跨交换进行通信。
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