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Network Bridge Types

Although network bridges lost popularity, they still have uses in some applications such as providing Internet services to clients restricted to a specific MAC address, and basic home networks that use software or hardware bridges for sharing Internet connections. Bridges also come in useful in token ring networks and transitional networks where both a token ring network and a traditional Ethernet network bind together through the bridge.

Transparent Bridges

1. When you use a service provider that requires you to configure a specific hardware (MAC) address on your network adapter to connect to the Internet, you use a bridge without being aware of it. This bridge gives you access to the Internet shared with other computers in the local network of your service provider, turning it into more like a traditional network than a sophisticated service provider network. Each computer uses its own MAC to identify itself and the service provider's router gives an IP address for each MAC address it finds.

Source Route Bridges

2. Source route bridges control token ring networks, where data forwards to every computer in the "ring" until it reaches its destination. Upon reaching it, the destination computer sends back information to the source computer and "frees" the token, giving the other computers a chance to send data. This happens very quickly, and a source route bridge controls the entire scenario, sending packets of data with the full path they will take in their headers.

Translational Bridges

3. These bridges aid the transition of token ring packets into a traditionally routed Ethernet network. The bridge acts as one of the computers so it doesn't "talk out of turn" and forwards any data it receives to the Ethernet network for processing by a router. The bridge usually acts also as the router, reducing the amount of devices necessary to complete a task and making the transfer between networks more efficient. Each packet routes to an IP address.

Software ICS Bridges

4. Internet Connection Sharing comes as a feature of Windows from its XP version and onto newer versions of the operating system. This can be done by bridging two Ethernet connections tied to the computer's network interfaces, making the computer into a sort of pseudo-router. The only disadvantage is that the computer hosting the bridge must be on continuously to act as the bridge. Otherwise, the Internet connection remains idle and no other computers can use the connection.