单选题Router# show interfaces serial 0/1 命令的输出显示了如下内容:   Serial0/1 is down, line protocol is down.   线路协议为 down(关闭)的原因最可能是什么()ASerial0/1 为关闭状态B路由器未连接电缆C远程路由器正在使用 serial 0/0 接口D尚未设置时钟频率

单选题
Router# show interfaces serial 0/1 命令的输出显示了如下内容:   Serial0/1 is down, line protocol is down.   线路协议为 down(关闭)的原因最可能是什么()
A

Serial0/1 为关闭状态

B

路由器未连接电缆

C

远程路由器正在使用 serial 0/0 接口

D

尚未设置时钟频率


参考解析

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