问答题

简答题 Two Cisco routers are connected to each other and are enabled CDP. Serial line is up，protocol is also up but cdp neighbor not working. What layer of the OSI model does the problem most likely exist？

【参考答案】

Data link layer.

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CCNP(642-832)

简答题 Two Cisco routers are connected to each other and are enabled CDP. Serial line is up，protocol is also up but cdp neighbor not working. What layer of the OSI model does the problem most likely exist？