What is classified by the range of the network and the distance between computers?

According to the scope of the network and the distance between computers, it is divided into: local area network, metropolitan area network and wide area network. A local area network refers to a regional network formed in a local area, which is characterized by a limited distribution area and can be large or small; a metropolitan area network is a computer communication network established within a city; a wide area network is a local area network or metropolitan area network that connects different regions Remote network for computer communications.

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

There are different classification methods for networks from different perspectives, and each network name has a special meaning. The combination of several names or names plus parameters can better reveal the characteristics of the network.

According to the scope of the network and the distance between computers, it is divided into: local area network, metropolitan area network and wide area network.

Local Area Network

A local area network is naturally a regional network formed in a local area. Its characteristic is that the distribution area is limited, and it can be large or small, as large as a building. The connection between the building and adjacent buildings 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. [3]

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 range of 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.

Metropolitan Area Network

Metropolitan Area Network (Metropolitan Area Network) is a computer communication network established within a city, referred to as MAN. It is a broadband local area network. Due to the use of LAN technology with active switching elements, the transmission delay in the network is small. Its transmission medium mainly uses optical cables, with a transmission rate of more than 100 Mbit/s.

An important use of MAN is as a backbone network, through which hosts, databases, and LANs located in different locations in the same city are connected to each other. This function is similar to that of WAN, but the two There are great differences in implementation methods and performance.

Based on a large LAN, usually using technology similar to LAN. One of the main reasons why MAN is listed separately is that there is already a standard: Distributed Queue Dual Bus DQDB (Distributed Queue Dual Bus), that is, IEEE802.6. DQDB is composed of dual buses, and all computers are connected to it.

Wide Area Network

Wide Area Network (English: Wide Area Network, abbreviated as WAN), also known as wide area network, external network, and public network. It is a remote network that connects computer communications in local area networks or metropolitan area networks in different areas. Usually spans a large physical range, covering a range from tens to thousands of kilometers. It can connect multiple regions, cities and countries, or span several continents and provide long-distance communications, forming an international network. remote network.

The transmission medium of WAN mainly uses telephone lines or optical fibers, and ISP operators connect enterprises. These lines are pre-buried under the road by ISP operators. Because the project is huge, maintenance is difficult, and the bandwidth is It can be guaranteed, so it will be more expensive in terms of cost.

The Internet generally refers to a public wide area network. The cost of a public wide area network will be lower and it is a cheaper online environment. However, compared with a wide area network, it cannot be managed. Bandwidth, using a public online system, the bandwidth of any section cannot be guaranteed.

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