Figure 124 Collapsed Campus Design

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In Figure 12-4, you can see there is still a distinct access layer for user connections and edge connectivity, but in the case of the data center devices, the core switch is acting as an access layer for them as well. This design is very common in midsize networks.

In even smaller networks (Figure 12-5), all three layers can be collapsed into a single device (sometimes even an L2 switch rather than an L3). Here, only the edge connectivity is separated as an additional layer.

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