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What is Bridge ?

Bridge   

  • Bridge is a networking device ,which is used to connect two LANs(local area network).
  • Bridge works under datalink layer of OSI (open system interconnection).
  • Bridge can divide a larger network into two smaller segments.so,Traffic is low in case of Bridge.
  • When packet enters into a bridge,it reads the address(Media access control) and compares that address with a table(containing address of all the nodes of both the segments).When the bridge finds a match ,it sends packet to the destination segment but not to the destination device.
  • Lets take an example for better understand :-  

  • If pc1 sends data to pc5 ,First of all data will goes to bridge then bridge will decide in which segment pc5 is connected.Then bridge will sends data to the destination segment .It means data will goes to pc5  and also data will goes to pc4 and pc6.

  • Here in segment A pc1,pc2 and pc3 is connected and in segment B pc4,pc5 and pc6 is connected.

  • It has 2 Collision domains.

  • Bridge is the combination of both hardware and software.So,it can do both forwarding as well as filtering .

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