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.
|Figure: Bridge in Networking|
Bridge are both hardware and software devices.
Bridge operate "Date Link Layer" in OSI model.
The purpose of bridge as :
- Isolate network by MAC addresses.
- Manage network traffic by filtering packet.
- Translate from one protocol to another.