Quiz Entry - updated: 2026.07.14
What does OSI Layer 3 (Network) do?
OSI Layer 3 (Network) handles logical (IP) addressing and routing — finding the best path and forwarding packets between different networks. Routers operate here.
Layer 3 = Network Layer
Handles logical addressing and routing between different networks.
Key functions:
| Function | Description |
|---|---|
| Addressing | IP addresses (source/destination) |
| Routing | Finding best path to destination |
| Packet forwarding | Moving packets between networks |
Key protocol: IP (Internet Protocol)
Devices: Routers operate at Layer 3
Memory tip: Layer 3 is the "Navigation" layer - it figures out how to get there!
Go deeper:
Network layer — logical addressing, routing, and packet forwarding between networks.- Routing protocol — how routers learn the best path used at this layer.