Hierarchical Network Model
Access layer
Provides user access to network.
Generally incorporates switched LAN devices that provide connectivity to workstations, IP phones, servers, and wireless access points.
For remote users or remote sites provide an entry to the network across WAN technology.
Distribution layer
Aggregates LAN devices.
Segments work groups and isolate network problems.
Aggregates WAN connections at the edge of the campus and provides policy-based connectivity.
Implements QoS policies.
Core layer
A high-speed backbone.
Core is critical for connectivity, must provide a high level of availability and adapt quickly to changes.
Should provide scalability and fast convergence.
Should provide an integration point for data center.
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