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Repeater – A repeater operates at the physical layer.

Its job is to regenerate the signal over the same network before the signal becomes too weak or corrupted so as to extend the length to which the signal can be transmitted over the same network.

An important point to be noted about repeaters is that they do not amplify the signal.

When the signal becomes weak, they copy the signal bit by bit and regenerate it at the original strength.

It is a 2 port device.

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Bridge – A bridge operates at data link layer.

A bridge is a repeater, with add on the functionality of filtering content by reading the MAC addresses of source and destination.

It is also used for interconnecting two LANs working on the same protocol.

It has a single input and single output port, thus making it a 2 port device.