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Networking Fundamentals · Intermediate

Distribution Layer

The aggregation layer of a hierarchical network that connects access switches and enforces policy, routing and summarization.

Definition

Distribution switches commonly provide inter-VLAN routing, ACLs, QoS and first-hop redundancy for access layer subnets. They form the boundary between Layer 2 access and Layer 3 core.

Example

A pair of Layer 3 switches in each building serves as the distribution layer.

Exam tip

Distribution = policy, aggregation and inter-VLAN routing.

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