A bridge in networking is defined as a device that connects two or more separate networks or network segments, allowing them to communicate with each other. It operates at the data link layer (Layer 2) of the OSI model, where it forwards data packets based on the MAC (Media Access Control) addresses contained within them. By examining the destination MAC address of each incoming packet, the bridge determines whether to forward the packet to another segment of the network or discard it if it is destined for the local segment.
In networking, a bridge is defined by its function of connecting and managing traffic between different network segments based on MAC addresses. It functions as a traffic controller that selectively forwards data packets to the appropriate network segment, thereby reducing network congestion and optimizing data transmission efficiency.
For kids, a bridge can be explained as a special device that helps connect two or more islands (network segments) together so that people (data packets) can travel between them. It makes sure that data goes to the right place by looking at special addresses (MAC addresses), just like how a mailman delivers letters to the correct houses based on their addresses. By connecting these islands (network segments) with bridges, everyone (devices on the network) can communicate and share information effectively across the whole network.