A switch is a device that channels incoming data from any of multiple input ports to a specific output port. It then takes the data and sends it toward its destination. A switch operates at layer 2 or Data Link layer of the OSI model. At layers 2 it looks at each packet, and from the MAC address it determines which device the data unit is intended for. Then with this information the switch sends data it towards the devide's destination.
Layers 2 switching
- Hardware based bridging
- Wire-speed performance
- Collision domain per port
- Traffic containment based on Mac Address
Issues
- No traffic based on Mac address
- Can’t restrict where traffic can go
- No traffic between VLANs
- Unbounded Broadcast domain
- Servers are not centrally located
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