Project - Switches

Network designers can use the hierarchical network model as a framework to design a network that is easy to set up and troubleshoot. Using this model make the network flexible too. The hierarchical network design consists of three layers; the access layer, the distribution layer, and the core layer.

The access layer provides access to the network for local and remote workgroup users while the distribution layer provides a separation between the access and the core layers and also provides a connection point between the two. The core layer provides fast and efficient transportation of data.

An access layer device controls traffic by localizing broadcast and service request to the access media. A distribution layer device perform two functions, control access to resources of the core layer and use bandwidth efficiently. Core devices implement protocols and provide load balancing.

The example of an access switch I researched was the Cisco Catalyst 3750. This switch is able to support applications like IP telephony, wireless, and video which will improve productivity. This switch is part of Cisco's stackable switches which provides flexibility in designing networks. It is available in 24 and 48 port configurations, 10/100/1000, PoE and non-PoE models. The PoE+ models have 30W power on all ports in 1 rack unit. There is also an optional four 1 Gb Ethernet SFP or two 10 Gb Ethernet SFP+ uplink network modules. The 3750 is also backward compatible, has an enhanced limited lifetime warranty and utilizes Cisco EnergyWise, which reduces energy usage. It also comes with dual redundant modular power supplies and fans. The prices start around $2700.00 for a 24 port switch. Most companies request you contact them for a quote.

The Cisco Catalyst 4500 series switches are a midrange switch capable of layer 2-4 switching. They are designed for several hardware applications including layer 3 distribution points. This switch provides QoS for Layer 2 class of service (CoS) and Layer 3 type of service (ToS). Provides scalability for layer 3 distribution points. Other options are similar to the 3750 switch. Pricing varies depending on how the switch is set up. Most prices start around $3200.00.

The Catalyst 6500 series addresses gigabit scalability and multilayer switching. It supports a wide range of interface densities and performance. Like the other Cisco switches it is scalable and can be customized to suit the client's needs. Prices start at $6500.00.