以下关于以太网交换机转发表的叙述中，正确的是（）。
- A.交换机的初始MAC地址表为空
- B.交换机接收到数据帧后，如果没有相应的表项，则不转发该帧
- C.交换机通过读取输入帧中的目的地址添加相应的MAC地址表项
- D.交换机的MAC地址表项是静态增长的，重启时地址表清空
正确答案及解析
正确答案
解析
B错误，因为交换机接收到数据帧后，如果没有相应的表项，交换机慧采用ARP洪泛操作，即广播方式进行转发。C错误，因为交换机通过读取输入帧中的源地址添加相应的MAC地址表项。D选项错误，交换机的MAC地址表项是动态增长的。所以选A。
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