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Q: At which layer of the OSI model would you assume the problem is if you type show interface serial 1 and receive the following message? Serial 1 is down, line protocol is down

  • 1
    Physical layer
  • 2
    Data Link layer
  • 3
    Network layer
  • 4
    None
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  • Workspace

Answer : 1. "Physical layer"
Explanation :

Answer: A) Physical layer Explanation: If you see that a serial interface and the protocol are both down, then you have a physical layer problem. If you see serial 1 is up, line protocol is down, then you are not receiving (Data Link) Keepalives from the remote end.

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