Network Model

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Network Model

Network Model

We going to allocating an estate agents company in London. The company has around 100 staff members across 10 branches across London. They aim to offer the best services for professionals in both renting and property sales. For this purpose we use Cisco Network Design model.

It focuses on another important network model, the Cisco hierarchical network design model. Very different that the OSI model, this model is used as the basis for designing Cisco networks for security and performance. The article provides an overview of the roles and responsibilities of each of the model's 3 layers.

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When it comes to network design, you're pretty much left with two options - a flat design, or one that involves some type of hierarchy. A flat design can be very limiting in terms of performance and scalability, and in all but the smallest networks would not be recommended. For example, on a flat network issues like broadcast traffic can quickly overwhelm network systems and negatively impact performance. In contrast, a hierarchical design will allow for unique divisions of responsibility to be created on the network. Thus a higher degree of performance, reliability, scalability and security can be achieved. The Cisco network design model is a reference model for creating hierarchical networks that attempts to account for these factors, while also providing an insight as to where different network elements should be deployed and why.

The Cisco network design model consists of three layers. These include:

* The Core Layer

* The Distribution Layer

* The Access Layer

While the OSI model is concerned with how different systems communicate over networks, the Cisco hierarchical model is a blueprint of types that defines how networks should be designed in layers. Each layer is meant to have its own roles and responsibilities, but the goal is to create a network that delivers high performance, is manageable, and keeps required roles in their place. While this model was designed by Cisco, its use can by all means be adapted to account for the switching and routing equipment of any vendor.

The model is made up of three layers, including Core, Distribution, and Access. The diagram below shows each of these layers relative to one another.

The Core layer of the network would be considered along the same lines as the backbone - high speed and redundant. The Distribution layer would contain intermediate switches and routers, such as those used to route between subnets or

VLANs. The Access layer is literally where user's PCs plug into their local switch, somewhere like an area wiring closet. While this is a simplified view of the network, it provides a general high-level overview.

Getting a little deeper into things, each layer of the model is actually home to multiple roles and responsibilities. Remember that this is a model, and as such not all networks will necessarily look like this - many, especially smaller ones, may not even be ...
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