Explain the three main troubleshooting methods.

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