Core Distribution Access Edge

Most of the network design seen today follows a model of core, distribution, and access. Figure 12-1 shows a basic model of this design when applied to a campus network. The access layer is where most end hosts connect to the network. Typically, it is the wiring closets in a building or on a floor. The access layer has historically been Layer 2 (L2), meaning no routing occurs on the first device to which a PC connects. Over time, more Layer 3 (L3) and higher decisions can be made at the access layer. For example, a VLAN access control list (VACL) can make decisions on frames at L3 even though no routing is configured on the device.

Figure 12-1. Core, Distribution, and Access Campus Design

[View full size image] SJto A USAr ConiViflrv.ly

Figure 12-1. Core, Distribution, and Access Campus Design

[View full size image] SJto A USAr ConiViflrv.ly

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Connectivity

Dala Center

EdSjO

Connectivity

Dala Center

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