Bridge is a computer Network device that interconnects two or more networks that use the same Data-link Layer protocols above the Media Access Control sublayer, but can use different Media Access Control protocols which is the process of bridging.

Bridges work on the Data-link Layer maintain a Learned MAC Address table for all Local Area Networks which it is connected.

Bridge connects a Local Area Network (LAN) to another Local Area Network that uses the same protocol.

Bridge looks at the destination of the packet before forwarding and restricts transmission on other Local Area Networks if destination found. When the destination Local Area Network is not found the packet is broadcast on all Local Area Networks except the source Local Area Network.

A bridge works at the data-link (physical network) level of a network, copying a data frame from one network to the next network along the communications path.

Bridging is distinct from routing. Routing allows multiple networks to communicate independently and yet remain separate, whereas bridging connects two separate networks as if they were a single network (hence the name "bridging"). Bridge, in the OSI-Model,is performed in the first two layers, below the Network Layer (layer 3).

If one or more segments of the bridged network is a Wireless Network, the device is known as a wireless bridge and the function as wireless bridging. Bridge or the process of Bridging is standard by the IEEE 802.1 Working Group.

More Information#

There might be more information for this subject on one of the following: