A bridge segment or divide a network to isolate traffic related problem.

A bridge sends the data frames only to the concerned segment.

Bridges are used to connect dis-similar network like ethernet system to Token Ring-System. Thus bridge used to join network using CSMA/CD access and token passing access.

Bridge in Networking
Figure: Bridge in Networking 

Bridge are both hardware and software devices.

Bridge operate "Date Link Layer" in OSI model.

The purpose of bridge as :

  1. Isolate network by MAC addresses.
  2. Manage network traffic by filtering packet.
  3. Translate from one protocol to another.

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