The Distribution Layer block combines and aggregates the Access Layer block components, and it uses Layer 2 and Layer 3 switching to break up the workgroups or VLANs, isolate the different network segments as failure domains, and reduce broadcast storms. It also acts as a transit module between the Access and the Core Layers.
Some important questions that must be answered before designing the Distribution Layer block include the following:
- Should Layer 2 or Layer 3 switches be used? Cost is a big issue in this decision, and the available budget will dictate the hardware to be used . . .
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