What is the router used for in the LAN?

The router in the local area network is used to select the network path; the router is a hardware device that connects two or more networks. It acts as a gateway between the networks. It reads the address in each data packet and then decides how to Dedicated intelligent network equipment for transmission.

#The operating environment of this article: Windows 7 system, Dell G3 computer.

The function of the router in the LAN is network access selection.

A router is a hardware device that connects two or more networks. It acts as a gateway between networks. It is a dedicated intelligent network device that reads the address in each data packet and then decides how to transmit it. It can understand different protocols, such as the Ethernet protocol used by a local area network and the TCP/IP protocol used by the Internet.

In this way, the router can analyze the destination addresses of data packets from various types of networks, convert the addresses of non-TCP/IP networks into TCP/IP addresses, or vice versa; and then based on the selected routing algorithm Send each data packet to the designated location according to the best route. So the router can connect non-TCP/IP networks to the Internet.

The function of a router is to transmit data between different subnets. The specific functions are as follows:

(1) Realize the interconnection of IP, TCP, UDP, ICMP and other networks.

(2) Process the data. It can send and receive data packets and has various functions such as packet filtering, multiplexing, encryption, compression and protection wall of data.

(3) Select the next transmission destination of the data packet based on the information in the routing table.

(4) Exchange topology information between the external gateway protocol and other autonomous domains.

(5) Implement network management and system support functions.

Related expansion introduction:

A local area network is naturally a regional network formed in a local area. Its characteristic is that the distribution area is limited, which can be large or small, as large as a building and adjacent buildings. The connection between them can be as small as the connection between offices. Compared with other networks, the LAN itself has faster transmission speed, more stable performance, simple framework, and closed nature, which is why many organizations choose it. The local area network itself is generally composed of computer equipment, network connection equipment, and network transmission media. Computer equipment includes servers and workstations, and network connection equipment includes network cards, hubs, and switches. Network transmission media is simply Network cable is composed of three major components: coaxial cable, twisted pair and optical cable.

A LAN is a private network, typically within or near a building, such as a home, office, or factory. Local area networks are widely used to connect personal computers and consumer electronic devices, allowing them to share resources and exchange information. When LANs are used in companies, they are called enterprise networks.

A local area network connects various computers, external devices and databases in a certain area to form a computer communication network, and connects to local area networks or databases in other places through dedicated data lines to form a larger information processing system. LAN connects network servers, network workstations, printers and other network interconnection devices through network transmission media to achieve system management files, share application software, office equipment, send work schedules and other communication services. The LAN is a closed network, which can prevent information leakage and external network virus attacks to a certain extent, and has high security. However, once an incident such as a hacker attack occurs, it is very likely to cause the entire LAN to be paralyzed, and all work within the network will be unable to do so. Conduct or even leak a large number of company secrets, causing serious damage to the company's business development. In 2017, the country promulgated the "Cybersecurity Law of the People's Republic of China", which officially came into effect on June 1. It clearly stipulates network security and information security from a legal perspective, and puts forward corresponding requirements for network operators and users. Improve the security of network use.

(Related knowledge sharing: windows)

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