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What is Switch ?

Swich 
Switch is a networking device which is used to connect bunch of devices together in a network through twisted pair cable .
It works under data link layer of the OSI(open system interconnection) model.
It consists of both hardware and software.so, it can do both forwarding and filtering.
When data enters into a switch ,it reads the address and compares that address with  a table called CAM table(content accessible memory where switch maintains port number and MAC address).when it finds a match it sends data to the destination port.Lets take an example for better understand-
If pc1 sends data to pc3,First of all data will goes to switch.Then switch reads the  address which is contained in the frame.Then compares that address(MAC address) with CAM table .when it finds a match that pc3 is connected with port number c ,it immediately sends data to the Pc3.It supports unicast , multicast and broardcast transmission.Switch has one broardcast domain . Every port of Switch is separate collision domain,it means if 5 devices are connected with Switch then broadcast Domain is 5.So,in case of switch there is no Collision occurs .Because Each  devices are conneced with each other through a dedicated path.Switch communicates on the basis of full duplex mode which means  both station can communicate with one other simultaneously at a time.

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