单选题关于FastEthernet的描述中，错误的是（）A协议标准是IEEE802.3uB只支持光纤作为传输介质C可用交换机作为核心设备D最大传输速率为100Mbps
单选题
关于FastEthernet的描述中，错误的是（）
A
协议标准是IEEE802.3u
B
只支持光纤作为传输介质
C
可用交换机作为核心设备
D
最大传输速率为100Mbps
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