Your Troubleshooting Framework

The OSI Model gives you a systematic approach to understanding and troubleshooting networks. Seven layers, each with a specific job, each a potential point of failure.

Key takeaways:

• Focus on Layers 1-4 for production troubleshooting
• Start at Layer 1, work your way up
• 80% of problems are physical — check cables first
• “Please Do Not Throw Sausage Pizza Away”