Hierarchical internetworking model

The Hierarchical internetworking model is a three-layer model for network design first proposed by Cisco. It divides enterprise networks into three layers: core, distribution, and access layer.

Access layer

End-stations and servers connect to the enterprise at the access layer. Access layer devices are usually commodity switching platforms, and may or may not provide layer 3 switching services. The traditional focus at the access layer is minimizing "cost-per-port": the amount of investment the enterprise must make for each provisioned Ethernet port. This layer is also called the desktop layer because it focuses on connecting client nodes, such as workstations to the network.

Distribution layer

The distribution layer is the smart layer in the three-layer model. Routing, filtering, and QoS policies are managed at the distribution layer. Distribution layer devices also often manage individual branch-office WAN connections. This layer is also called the Workgroup layer.

Core layer

The core network provides high-speed, highly redundant forwarding services to move packets between distribution-layer devices in different regions of the network. Core switches and routers are usually the most powerful, in terms of raw forwarding power, in the enterprise; core network devices manage the highest-speed connections, such as 10 Gigabit Ethernet or 100 Gigabit Ethernet.

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gollark: I prefer less freeform interfaces; they have about the same restrictions, generally, but they're actually documented and obvious.
gollark: The voice input thing makes it seem like you can interact with the virtual assistant things like an actual human, except they'll just immediately fall over if you ask anything complex because NLP is hard.
gollark: As well as the privacy aspect, they often aren't actually that good.
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See also

References
  • Khalid Raza, Mark Turner (2002), Cisco Network Topology and Design, Cisco Press
  • High Availability Campus Network Design, retrieved 2010-08-23


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