What is a router used for? 5, What is the use of a router?

The role of the router.

One of the functions of the router is to connect different networks, and the other is to choose the route to which the information is transmitted. Choosing a smooth and fast shortcut can greatly improve the communication speed, reduce the communication load of the network system, save the network system resources, and improve the smooth rate of the network system, so that the network system can play a greater role. From the point of view of filtering network traffic, routers function very similarly to switches and bridges.

But unlike switches, which work at the physical layer of the network and physically divide network segments, routers use specialized software protocols to logically divide the entire network. For example, a router that supports the IP protocol can divide the network into multiple subnetwork segments, so that only network traffic destined for a specific IP address can pass through the router. For each received packet, the router recalculates its check value and writes a new physical address.

As a result, using routers** and filtering data tends to be slower than switches that only look at the physical address of the packet. However, for those networks with complex structures, the use of routers can improve the overall efficiency of the network. Another obvious advantage of routers is that they can automatically filter network broadcasts.

In general, the entire installation process of adding a router to a network is much more complex than a plug-and-play switch. Generally speaking, heterogeneous network interconnection and multiple subnet interconnection should be done by routers. The main job of the router is to find the best transmission path for each data frame passing through the router and efficiently transmit that data to the destination site.

It can be seen that the strategy of selecting the best path, that is, the routing algorithm, is the key to the router. In order to complete; In this work, the relevant data of various transmission paths is stored in the router - the routing table (routingptable) for routing selection; . The route table stores the flag information of the subnet, the number of routers on the network, and the name of the next router.

The path table can be fixed by the system administrator, dynamically modified by the system, automatically adjusted by the router, or controlled by the host. 1 Static path table p The fixed path table set by the system administrator in advance is called static path table, which is generally pre-set according to the configuration of the network during system installation, and it will not change with the change of network structure in the future. 2 Dynamic Path Tablep Dynamic Path Table is a route table that is automatically adjusted by the router according to the operation of the network system.

According to the functions provided by the routing protocol, the router automatically learns and memorizes the network operation conditions, and automatically calculates the best path for data transmission when needed.

To put it simply. The router is the best technology that provides data packets.

Realize the interconnection of internal and external networks.

You can connect a network cable to several computers at the same time, or you can press to connect to the orange area network.

A router is something that implements dial-up instead of moden, splitting a play line to multiple uses.

Multiple computers can access the Internet at the same time with one network cable.

Internet speeds are uneven.

Just as fast.