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This level or tier of the hierarchical design model, from Cisco, acts as the front door to the network, and provide control for unauthorized network entry; first line of security defense.
Core Layer
Access Layer
Physical Layer
Distribution Layer
In Cisco's three tier networking model, the access layer acts as the network's first line of defense (front door to the network). End users or hosts are commonly found here accessing network resources. Access lists are also implemented here as a method of safeguarding the network from unauthorized entry. Address aggregation, route summarization, routing updates and VLAN information are handled at the Distribution layer. The Core layer provides very high-speed data transfer, data encryption, address translation and access-list checking. (http://www.cisco.com/web/learning/netacad/demos/CCNP1v30/ch1/111/index.html)
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