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What layer of the OSI model would you assume the problem is in if you type show interface serial 1 and receive the following message?"Serial1 is down, line protocol is down."
- a)Physical layer
- b)Data Link layer
- c)Network layer
- d)None. It is a router problem.
Correct answer is option 'A'. Can you explain this answer?
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What layer of the OSI model would you assume the problem is in if you ...
If you see that a serial interface and the protocol are both down, then you have a Physical layer problem. If you see serial1 is up, line protocol is down, then you are not receiving (Data Link) keepalives from the remote end.
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What layer of the OSI model would you assume the problem is in if you ...
Explanation:
Physical Layer:
- The Physical layer of the OSI model is responsible for the actual physical connection between devices.
- When you receive the message "Serial1 is down, line protocol is down," it indicates a physical connectivity issue.
- The message suggests that the router interface Serial1 is not able to establish a connection at the physical layer.
Data Link Layer:
- The Data Link layer is responsible for node-to-node communication, error detection, and flow control.
- If the Data Link layer was the issue, you would likely see a different error message related to data link protocols.
Network Layer:
- The Network layer handles routing and logical addressing.
- Since the error message pertains to the physical connection of Serial1, it is unlikely to be a Network layer problem.
Conclusion:
- Based on the error message received, the most probable layer where the issue lies is the Physical layer.
- To resolve the problem, you may need to check the physical connections, cables, and hardware related to the Serial1 interface.
Physical Layer:
- The Physical layer of the OSI model is responsible for the actual physical connection between devices.
- When you receive the message "Serial1 is down, line protocol is down," it indicates a physical connectivity issue.
- The message suggests that the router interface Serial1 is not able to establish a connection at the physical layer.
Data Link Layer:
- The Data Link layer is responsible for node-to-node communication, error detection, and flow control.
- If the Data Link layer was the issue, you would likely see a different error message related to data link protocols.
Network Layer:
- The Network layer handles routing and logical addressing.
- Since the error message pertains to the physical connection of Serial1, it is unlikely to be a Network layer problem.
Conclusion:
- Based on the error message received, the most probable layer where the issue lies is the Physical layer.
- To resolve the problem, you may need to check the physical connections, cables, and hardware related to the Serial1 interface.
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