What is a Router? Does it do anything?

Please, the upstairs brother said so much, I'm confused, and as our general users, we only need to understand the router for sharing the Internet, and LAN management, and other advanced functions, we don't need to know so much, besides, we may not be able to use it.

A router is a functional device of the network, which organizes the normal operation of the network from the management level.

Routing refers to the movement of information from a source to a destination over an interconnected network. In general, information passes through at least one or more intermediate nodes during routing. Often, people compare routing and switching, mainly because the average user sees the two as exactly the same thing.

In fact, the main difference between routing and switching is that switching takes place at the second layer of the OSI reference model (the data link layer), while routing takes place at the third layer, which is the network layer. This difference determines that routing and switching need to use different control information in the process of moving information, so the way they achieve their respective functions is different.

Function. 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, using a router 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.

Introduction to the functions of the router:

1. Packets sent to the remote network segment are received between networks, which plays the role of **.

2. Select the route with the most reasonable modulus to guide the communication. In order to achieve this function, the routing Danchang leather device needs to find the routing table according to a certain routing communication protocol. The routing table lists the nodes contained in the entire internetwork, as well as the paths between the nodes and the transmission charges associated with them.

If there is more than one path to a particular node, the optimal (and most economical) path is selected based on predetermined criteria. Since the various network segments and their interconnection conditions may change, the information of the routing situation needs to be updated in a timely manner, which is done by the regular update specified by the routing information protocol used or the update according to the changing situation. Each router in the network dynamically updates the routing table it maintains according to this rule in order to maintain valid routing information.

3. In the process of ** packet, in order to facilitate the transmission of packets between networks, the router decomposes large data packets into appropriate size packets according to predetermined rules, and then packages the decomposed data packets into the original form after arriving at the destination.

4. Multi-protocol routers can connect network segments using different communication protocols as a platform for communication connections of network segments with different communication protocols.

5. The main task of the router is to guide the communication to the destination network, and then reach the specific node station address. The latter function is done through network address decomposition. For example, the allocation of the coarse address portion of a network is specified as a group of nodes in the network, subnet, and region, and the rest is used to indicate special stations in the subnet.

Hierarchical addressing allows a router to store address information for a network with many nodes.

6. Dynamic speed limiting: dynamic speed limiting router is a kind of router that can calculate the bandwidth required by each user in real time, accurately analyze the type of user surfing the Internet, and reasonably allocate bandwidth to achieve on-demand distribution and reasonable use, and also has the intelligent deployment function of priority channel, which is mainly used in Internet cafes, hotels, communities, schools, etc.