The difference between bridge and router
The bridge is a simple related device. Its sole purpose is to divide the physical network that is being shared into many small parts. Bridges usually have only 2 ports; bridges with more than 2 ports are called switches.
Because Ethernet is the most commonly used physical network, we will use it to illustrate our point of view. On an Ethernet, all access computers share the same "wire" (not physically the same, but electrically connected). When two computers try to talk at the same time, they will be overwhelmed by each other. This is called a conflict. The more computers on the Ethernet, the greater the chance of conflict.
The bridge divides the Ethernet into many conflict domains. Unless the computer on the other side of the bridge orders, all the data on the side of the bridge will remain there, thus reducing the burden on the 1st stage.
Bridges do not consider the protocols (TCP / IP, IPX, AppleTalk, ect.) That users use on the Internet because they work at the data link layer. This is both an advantage and a disadvantage; because they work on a simple layer, bridges can operate blindly at high speed, but they will transmit data indiscriminately, and we can hardly control its work. Since then the router was born.
Routers work at the network layer-they actually know the protocol for transmitting data over the network. Because they know the protocol, they can follow rules to decide how to process specific data.
For this reason, routers are useful in connecting networks for different purposes or different organizations. Users can apply rules or filters to pass specific data, but not other data. Or arrange for the data serving a certain purpose to enter a specific network connection, and other data skip this connection.
This service is charged. The router gets a detailed description of the specific data, and the longer the delay in sending the data to the destination. Therefore, the higher the cultivation of fast routers, the more expensive the hardware.
In short, in most large networks today, you can find a mixture of switches (based on multi-port bridges) and routers. Both have their advantages and disadvantages-but their combination is an effective combination.
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