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路由器出现Serial interface-number is up，line protocol is down（DTE）的状态，可能出现的问题不包括（）。

  • A、本地或远程路由器配置丢失
  • B、线路故障
  • C、CSU/DSU故障
  • D、LINE未与CSU/DSU联接

参考答案

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