Addressing Internet Connectivity Issues Using the OSI Model

How can you use the OSI model to troubleshoot network connectivity issues?

a. Random layer approach

b. Divide and conquer approach

c. Bottom up approach

d. Top down approach

Answer:

c. Bottom up approach will be used in this scenario.

When troubleshooting network connectivity issues using the OSI model, the bottom-up approach involves starting from the Physical layer and working upwards through each layer of the model to identify and resolve the problem. This approach ensures that all possible causes are considered and addressed systematically.

The OSI or Open Systems Interconnection model consists of seven layers, each with its unique functionality:

1. Physical layer

2. Data link layer

3. Network layer

4. Transport layer

5. Session layer

6. Presentation layer

7. Application layer

Layers 1-3 are considered hardware layers, 4 is the core layer of the OSI model, and 5-7 are software layers.

By starting from the Physical layer, you can rule out any physical connectivity issues, such as faulty cables or hardware, before moving on to investigate potential problems in the higher layers of the model.