Hierarchical Network Design

Hierarchical Network Design
Involves dividing the network into separate layers. This way the network design becomes modular and it improves its performance and scalability. The hierarchical network design is broken down into 3 layers which are access, distribution and core layer.

Access Layer
The access layer purpose is provide a way to connect devices to the network and also control which of these devices should have control on a network. The access layer deals with end devices such PCs, printers, and IP phones to enable them to access the network. It can also include devices such as routers, switches, and hubs and wireless access points.


Distribution Layer

The Distribution Layer deals with the connection point between the core and access layers. It includes LAN-based routers and Layer 3 switches. The layer ensures that packets are properly routed between
Subnets and VLANs.

Core Layer
is the high-speed backbone of the internetwork. This layers main concern is speed. It might also do QoS on if its required on the Network.


There are many benefits associated with Network designs
Scalability
Hierarchical network can be expanded easily

Redundancy
At the core and distribution layers path availability is ensured

Performance
Performance is enhanced since the transmission of data low performing devices is avoided.

Security
Security is improved because of the port security set up at the access level and the policies which are enabled at the distribution level.

Manageability
Consistency between switches at each level management more simple.

Maintainability
The modularity of hierarchical design allows for network to scale without becoming Overly complicated.