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【单选题】
关于网桥和交换机,下面的描述中正确的是( )。
A.
网桥端口数量少，因而比交换机转发更快
B.
网桥转发广播帧，而交换机不转发广播帧
C.
交换机是一种多端口的网桥
D.
交换机端口多，因而扩大了冲突域的大小
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