Explain the three main troubleshooting methods.
Bottom-up troubleshooting method:
- Start with the network’s physical components, and work up through the layers of the OSI model until you identify the cause of the problem.
- This is a good approach to use when you suspect that the problem is physical.
Top-down troubleshooting method:
- Examine the end-user application first.
- The analysis continues downward from the upper layers of the OSI model until the cause of the problem is identified.
Divide-and-conquer troubleshooting method:
- Select a layer, and test in both directions from the starting layer.
- If you can verify that a layer is functioning properly, typically it is safe to assume that the layers below it are functioning.
- If a layer is not functioning properly, gather symptoms of the problem at that layer, and work your way down.
Exam with this question: EWAN v4 Chapter 8 Check Your Understanding: Network Troubleshooting
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