Shulou(Shulou.com)06/02 Report--

Editor to share with you what lan, man and wan represent. I hope you will get something after reading this article. Let's discuss it together.

Lan, man and wan represent local area network, metropolitan area network and wide area network, respectively. The full name of wan is Wide Area Network, which means "wide area network" in Chinese. It is a remote network that connects computers in different regions of the local area network or metropolitan area network, covering a range from tens of kilometers to thousands of kilometers.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

Lan, man and wan represent local area network, metropolitan area network and wide area network, respectively.

LAN (LAN)

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.

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.

MAN (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.

Metro network is divided into three layers: core layer, aggregation layer and access layer:

The core layer mainly provides high-bandwidth service bearer and transmission to complete the interconnection with existing networks (such as ATM, FR, DDN, IP networks), which is characterized by broadband transmission and high-speed scheduling.

The main function of the aggregation layer is to provide the user service data aggregation and distribution processing to the service access node, and to realize the service level classification at the same time.

The access layer uses a variety of access technologies to allocate bandwidth and services to achieve user access, and access node equipment to complete the multiplexing and transmission of multi-services.

WAN (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 WAN is not the same as the Internet.

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.

After reading this article, I believe you have a certain understanding of what "lan, man and wan represent". If you want to know more about it, please follow the industry information channel. Thank you for your reading!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.