What is Switch in Networking || Networking Chapter III Part 3 ||

                    Networking Device - Switch

#Summary - In today's blog we will discuss about networking Switch

#Switches -

* A Switch is a Networking device used to connect separate LAN Segments ( Computers,Servers) like our electrical extension.

* A Switch filters and forwards packet through the network using MAC Address.

* Now today's time switches are mostly used in LAN. The cost of switch depends on the number of port (8,16,24 and 48 ports).

* Switch is layer 2 (data link layer) device.

* Switch decreases the amount of traffic on each Network Link.

 

# Working of Switch -

* In the network when switch receive data from connected device, so it forwards data only that port which the destination system is connected. Switch uses the MAC Address of the device to determine the correct port. Switch uses MAC Frame is divided into four parts -

*Example - If a device wants to send data to other device in a network so a prepares frame and sends to the switch. Switch receive the frame and check the MAC Address of the destination device in the frame and forward to that particular device.

* Note - Switch do broadcast only that time if destination system address is not found in switch's MAC Address table

#CRC (Cyclic Redundancy Check) - CRC is used to verify that data is receive without any errors. CRC is only 4 byte long and CRC value calculated by the sender's NIC.


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