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2.2.2. Three-Tier (Traditional)
Separates the network into three distinct layers: Access, Distribution, and Core.
Best for: Large enterprise networks, campus environments
| Layer | Function | Typical Devices |
|---|---|---|
| Core | High-speed backbone, minimal processing | L3 switches (Catalyst 9500) |
| Distribution | Policy enforcement, routing, filtering | L3 switches (Catalyst 9400) |
| Access | End-user connectivity, port security | L2/L3 switches (Catalyst 9200) |