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Cisco Three-Layer Hierarchical Model

As we know networks can be extremely complicated, with using multiple protocols and diverse technologies. Cisco developed a layered hierarchical model for designing a trusted & reliable network infrastructure. This Three Layer model helps you to design, implement and maintain a scaleable, reliable, cost-effective network. Each of layers has own features and function, which reduces network complexity.

Example of the Cisco hierarchical model as given below in diagram

Defining each 3 layer:-

  • Access – Which control user and work group access to the resources. This layer usually incorporates at Layer 2 can be switch and access points that provide connectivity between workstations.

  • Distribution – Serves as communication point between the access layer and the core layer, primary functions to provide filtering, routing and WAN access. Determines the fastest way that network requests are accessed.

  • Core – Referred to as Network Backbone, which is responsible for transporting of large amounts of traffic. It provides inter connectivity between both layers

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