Specifications

CHAPTER 1
Campus Network Design
Data Center Design
The core layer connects end users to the data center devices. The data center segment of a campus can vary in size from
few servers connected to the same switch as users in a small campus, to a separate network with its own three-layer
design in a large enterprise. The three layers of a data center model are slightly different:
n Core layer: Connects to the campus core. Provides fast switching for traffic into and out of the data center.
n Aggregation layer: Provides services such as server load balancing, content switching, SSL off-load, and security
through firewalls and IPS.
n Access layer: Provides access to the network for servers and storage units. Can be either Layer 2 or Layer 3
switches.
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CCNP SWITCH 642-813 Quick Reference by Denise Donohue
FIGURE 1-2
A Medium-Sized
Campus Network
Building Access Layer
Building
Distribution
Layer
Building Access Layer
Building
Distribution
Layer
Data Center
Core Layer
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