OSI Model

The 7 Layers

To perform network basics (port forwarding, NAT, packet filtering firewalls, etc) it is important to have a good understanding of the first 3 network layers. As a network adminsitrator, it is these layers that the equipment you deal with operate.

1. Physical
2. Link (Data Link)
3. Network
4. Transport
5. Session
6. Presentation
7. Application

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