A network switch is the small h/w devices that joins multiple computers within one local area network (LAN). Technically, network switches operate at second layer of the OSI standard, called “data link layer”.

                   It handle the message in frames. The switch is analyses the frames coming in on its entry ports and filter the data in order to focus solely on the right ports. (This is called switching and used in switched networks). As a result, the switch can act as both a port when filtering and as hub when handling connection.

                   The network switch, as indicated by its name, switches signal paths. So that message frame goes to specific destination.

                   A Switch will improve a network performance, especially on network with many computers because it has on-board intelligence to remember the path to each destination.

                   Determines destination of message and sends it only destination port.

                   On an Ethernet local area network (LAN), a switch determines from the physical device (media access control or MAC) address in each incoming message frame which output port to forward it to and out of. While in a wide area packet-switched network such as the internet, a switch determines from the IP address in each packet which output port to use for the next part of its the intended destination.

Provide full bandwidth to each station on network.

Handle several conversations at once.

More expensive than hubs.

Provide better performance.



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by hetal   more  in Networking  on 9/3/2015 4:27:16 AM  

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