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单选

命令Backup state-down 3表示(54)。

  • A.第三种备份down状态
  • B.主备份接口切换只能进行3次
  • C.当主接口down状态持续3秒后,切换到备份接口
  • D.当主接口逻辑通道时,如果呼叫3次未成功,则认为主逻辑通道处于down状态
试题出自试卷《软件水平考试(中级)网络工程师上午(基础知识)试题模拟试卷15》
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