Three-Tier Campus LAN Design

The three-tier LAN design consists of three hierarchical layers:

  • Access Layer

  • Distribution Layer

  • Core Layer

Core Layer

  • Connects Distribution Layers together in large LAN networks.

  • The focus is speed ('fast transport').

  • CPU-intensive operations such as security. QoS marking/classification, etc, should be avoided at this Layer.

  • Connections are all Layer 3. No spanning-tree!

  • Should maintain connectivity throughout the LAN even if devices fail.

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