Join ExamsbookAnswer : 1. "Physical layer"
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 down5
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
- 1Physical layertrue
- 2Data Link layerfalse
- 3Network layerfalse
- 4Nonefalse
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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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