How you can Pick a Network Switch
The network switch is among the most common network device implemented with company infrastructure and thus selecting any new switches or upgrading is often a major factor of most network design projects. The Cisco network switch components include Switch Chassis, Supervisor Engine, Switching Modules, IOS/CatOS software and Power Supplies. The choice to buy new switches or upgrade equipment is determined after with the network assessment and style features specified. Wireless designs, for example, could have network switches interfacing with access points. Which will affect the switch such as increased utilization, assigned switch ports, access control lists, Trunking, Spanning Tree Protocol and increased wattage tap into Control of Ethernet (PoE).
The Switch Chassis features include - chassis dimensions, amount of slots, processor slot assignments, switching fabric, engines types supported, power supplies, rack units needed.
Cisco switches are implemented having an Engine (Switch Processor) for processing packets over a network segment. Routing is accomplished with the on-board Multi Layer Switch Feature Card (MSFC) or Route Processor running IOS code. The switch Engine running IOS code about the MSFC and also the switch processor is at native mode, while those running CatOS around the processor will be in hybrid mode. Some engines won't support native and hybrid mode. The engine with no MSFC supports what is known as CatOS mode. Pick the engine which fits your design specifications. The MSFC module is integrated using the Engine or upgradeable. You should implement a PFC module with any MSFC. Some Engines don't have any MSFC module - the routing is integrated with all the hardware and therefore support native mode only. 
Cisco network switches may be deployed with IOS, IOS and CatOS or exclusive CatOS software. Design features determine what mode and IOS or CatOS version is selected. The software running on the way Processor should be IOS as the Engine Switch Processor will run IOS (native mode) or CatOS (hybrid mode). Some Cisco equipment like the 4507R deploy the Supervisor Engine IV without any MSFC onboard. The road Processor is integrated with all the engine. With this design, the Engine IV doesn't support CatOS.
Native IOS - deployed at the network edge where most routing occurs plus some switching is required
Hybrid - deployed on the network core and then there is both routing and high speed switching
CatOS - deployed with the network access layer where there is switching with no routing
Switch Process? The next describes the 5 components of any network switch process:
1. Take into account the network assessment and design features specified
2. Select switches which include every one of the design features
3. Select switches with proper scalability
4. Balance cost and equipment features while meeting budget guidelines
5. Select IOS and/or CatOS software version
The Network Assessment and design specifications is highly recommended prior to you buying any network switches. The network assessment examines the look, configuration and equipment which is implemented in the office the place that the selected devices is going to be deployed. The design specifications determines performance, availability and scalability features needed. Choosing the IOS and/or CatOS version occur after deciding on the feature set. Companies specify a budget which is actually a key consideration with any equipment selection. It's not cost effective to pick a Cisco 6509 switch with an office with 50 employees. It is important that you select equipment that match the design specifications, has the scalability features needed while meeting budget guidelines.
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