Course Overview

This course introduces the OSI Model — the seven-layer framework that explains how network communication actually works. Understanding these layers gives you a mental model for troubleshooting any network problem.

Topics covered:

• The seven layers of the OSI Model
• What happens at each layer
• Layer 1-4 deep dives (where troubleshooting happens)
• How to use the OSI Model for systematic troubleshooting
• OSI vs TCP/IP models

The Core Troubleshooting Framework

When someone says “Layer 2 problem” or “Layer 3 routing,” you’ll know exactly what that means — and more importantly, where to look when something breaks.