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This article mainly introduces which networks are divided according to the scope of the network and the distance between computers. What is introduced in this article is very detailed and has a certain reference value. Interested friends must finish reading it!

According to the scope of the network and the distance between computers are: local area network, metropolitan area network and wide area network. Local area network refers to a regional network formed in a local area, which is characterized by a limited distribution area, which can be large or small, and a metropolitan area network is a computer communication network established within a city. Wide area network is a remote network that connects local area networks or metropolitan area networks.

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

According to the scope of the network and the distance between computers are: 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, which is characterized by a limited distribution area, ranging from large to small, as large as the connection between a building and adjacent buildings, and as small as the connection between offices. Compared with other networks, local area network itself has faster transmission speed, more stable performance, simple framework, and is closed, which is the reason why many organizations choose. The composition of the local area network itself is generally composed of computer equipment, network connection equipment and network transmission media, in which the computer equipment includes servers and workstations, and the network connection equipment includes network cards, hubs and switchs. simply speaking, the network transmission medium is the network cable, which is composed of coaxial cable, twisted pair and optical cable.

A local area network is a private network, usually in 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 so that they can share resources and exchange information. When Lans are used in companies, they are called enterprise networks. [3]

Local area network connects all kinds of computers, external devices and databases in a certain area to form a computer communication network, and connects with local area networks or databases in other places through special data lines to form a wider range of information processing system. Through the network transmission medium, the local area network connects network servers, network workstations, printers and other network interconnected devices to achieve communication services such as system management files, sharing application software, office equipment, sending work schedules and so on. The local area network is a closed network, which can prevent information leakage and external network virus attacks to a certain extent, and has high security, but once events such as hacker attacks occur, it is very likely to lead to the paralysis of the local area network as a whole. all the work in the network can not be carried out, and even leak a large number of company secrets, causing a heavy blow to the development of the company. In 2017, the State promulgated the Network Security Law of the people's Republic of China, which formally came into effect on June 1. It made clear provisions on network security and information security from a legal point of view, and put forward corresponding requirements for network operators and users to 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 belongs to broadband local area network. Due to the use of local area network technology with active switching elements, the transmission delay in the network is small, its transmission medium is mainly optical cable, and the transmission rate is more than 100 megabits per second.

One of the important uses of MAN is to be used as a backbone network, through which hosts, databases, and LAN located in different locations in the same city are connected with each other, which is similar to the function of WAN, but there is a great difference in implementation method and performance.

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

Wide area network

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

The transmission medium of the wide area network is mainly using telephone lines or optical fiber, and the ISP operators connect the enterprises. These lines are pre-buried under the road by the ISP operators. Because the project is huge, the maintenance is not easy, and the bandwidth can be guaranteed, so the cost will be more expensive.

Generally referred to as the Internet is a public wide area network, the cost of the public wide area network will be lower, for a cheaper online environment, but compared with the wide area network, there is no way to manage bandwidth, take the public network system, any section of bandwidth can not be guaranteed.

The above is all the contents of this article entitled "what are the networks divided by the scope of the network and the distance between computers?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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