31 Days Before Your CCENT Certification

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Day 27. Identify and Correct Common Network Problems at Layers 1, 2, 3, and 7 Using a Layered Model Approach

The OSI and TCP/IP models provide an excellent framework for troubleshooting. You can isolate the network issue to a particular layer and test the protocols and configurations for that layer. With a layered model you have a road map for a step-by-step troubleshooting process. Chapters 3 and 9 of CCNA Discovery 1 and Chapter 2 of CCNA Discovery 2 discuss troubleshooting.

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