如果路由器显示“Serial 1 is down，line protocol is down”故障信息，则问题出在OSI参考模型的（58） 。
- A.物理层
- B.数据链路层
- C.网络层
- D.会话层
正确答案及解析
正确答案
解析
路由器显示“Serial 1 is down，line protocol is down”故障信息说明此接口的物理层和链路层协议都工作不正常。显然物理层是有问题的。
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