Bridge

Bridge is like a smart repeater. Repeaters in the network cable from a received signal, amplify them, and be sent to the next cable. In comparison, the bridge down from the level of information is more sensitive to upload some. Bridge is a kind of frame forwarding technology, according to MAC sub-blocks, can be isolated from the collision. Bridge over the network segment connecting the data link layer.
Bridge will connect two similar networks, and manage the flow of network data. It works on data link layer, not only to extend the network distance or range, and can improve network performance, reliability and security. Network 1 and Network 2 is connected by bridge, the bridge receives data packets sent network 1, checking the address of the packet, if the address belongs to the network 1, it will be a waiver, on the contrary, if the address of the network 2, it to continue to send to the network 2. This information can be isolated by a bridge, the network is divided into multiple network segments, isolated section of a safety net to prevent unauthorized access to other users of network segment. As the network segments, relatively independent of each segment, a segment of the fault will not affect the operation of another segment.
Bridge can be a specialized hardware device, you can also install the bridge by computer software to achieve, then the computer will be installed on multiple network adapters (network cards).