Main difference between router and bridge are that bridges are work on the bases of MAC address whereas routers are work on the basis of the IP address. Bridges are the layer-2 devices of the OSI layer and routers are the layer 3 devices of the OSI layer. When a host moves between the segments in routed network, then it need to be assigned a new IP address, and break all presented TCP connections. But when it moves in a bridged network, then it does not need to reconfigure something.