OSI Model Introduction

Layer 1 - Physical

Layer 2 - Data Link

Layer 3 - Network

Layer 4 - Transport

Layer 5 - Session

💡 NOTE: Cantrill does not have dedicated lectures on Layers 6 & 7. He has other lectures where he shows those layers implemented (e.g. SSL/TLS lecture for HTTPS). I might at some point include some basic info of those layers in these notes.