Computer networks can be divided into according to geographical scope:

Categorizing networks according to their geographic scope can be divided into wide area networks.

WAN), Local Area Network (LAN), Metropolitan Area Network (MAN).

Wide Area Network: Covers a wider range than both local area networks (LANs) and metropolitan area networks (MAN). The communication subnet of the WAN mainly uses packet switching technology.

The communication subnet of the WAN can make use of the public packet-switched network, the satellite communication network and the wireless packet-switched network, which will be distributed in different areas of the local area network or computer system.

Interconnect to achieve the purpose of resource sharing. For example, the Internet is the largest wide area network in the world.

LAN: LAN is a computer communication network that connects various computers, external devices and databases within a local geographical range (such as a school, factory and institution). It can be connected with a remote local area network, database or processing center through a data communication network or a dedicated data circuit to form a large-scale information processing system.

Metro: The so-called broadband metro network is a high-bandwidth, multi-functional, multi-service access multi-service communication network based on IP and ATM telecommunication technology, with optical fiber as the transmission medium, integrating data, voice and services. It can meet the increasing demand for high-speed and high-quality data communication services from institutions, finance and insurance, universities, primary and secondary schools, companies and enterprises, especially the demand for broadband high-speed Internet access from the rapidly developing Internet user base.

Computer networks are classified into three types according to their geographical scope:

1. LAN LAN

local area network), the geographical range is generally within a few hundred meters to 10 km, and it belongs to a small range of networks. Such as in a building, a school, a factory, etc. The LAN is simple, flexible and easy to use;

2. Metro area network MAN

metropolitan area network), the geographical range can range from tens of kilometers to hundreds of kilometers, can cover a city or region, is a banquet trembling medium form of network;

3. Wide area network.

WAN (Wide Area Network) is generally a large range of thousands of kilometers. For example, several cities, one or several countries are the largest networks in the network system, which can achieve a wide range of resource sharing, such as international Internet networks.

From the perspective of the scope of the network, how to classify computer networks? What is the difference between geographic distances?

Classification by geographical scope: 1LAN (Local Area Network)The geographical range of the LAN is generally within a few hundred meters to 10 km, which is a small range of networking.

The local area network is generally owned by a department or unit, which is easy to build, maintain, and expand, and the system is highly flexible. 2.Metropolitan Area Network (MAN) The geographical scope of the metropolitan area network can range from a few rough cavities of ten kilometers to hundreds of kilometers, which can cover a city or region, and is a medium-form network.

3.WAN (Wide Area Network) The geographical scope of the WAN is generally around a few thousand gongyan lead, which belongs to a large range of networks. For example, a few cities, one or a few countries, is the largest in the network system.

Computer networks are classified according to their geographical scope and can be divided into local area networks, metropolitan area networks, and wide area networks.

1. LAN LAN

LAN is a kind of network composed of multiple computers used in a small area, and the coverage area is usually limited to a range of 10 kilometers, which belongs to a small fan model fence formed by a unit or department.

2. Metro area network MAN

The metropolitan area network is a network that acts in the wide area network and the local area network, and its network coverage can usually extend to the whole city, with the help of communication optical fibers, a plurality of local area networks are connected to the public city network to form a large network, so that not only the resources in the local area network can be shared, but also the resources between the local area networks can be shared.

3. Wide Area Network (WAN).

Guangcheng network is a long-distance network that involves long-distance communication, and the coverage can be a country or multiple countries, or even the whole world. Because the geographical distance of the WAN can exceed several thousand kilometers, so the information attenuation is very serious, this kind of network generally needs to rent a dedicated line, through the interface information processing protocol and the line to connect, form a network structure, to solve the problem of pathfinding.

Basic terms for computer networks:

1. Domain Name System (DNS):

The Domain Name System (DNS) converts human-readable domain names, such as into machine-readable IP addresses, such as . It can be understood as the thinness of the design for the Internet.

2. File Transfer Protocol (FTP):

FTP is the English abbreviation of File Transfer Protocol, and the Chinese abbreviation is "Wenchuan Protocol". It is used for the bi-directional transfer of control files on the Internet. At the same time, it is also an application.

There are different FTP applications based on different operating systems, and all of them adhere to the same protocol to transfer files. In the use of FTP, users often encounter two concepts: "download" and "upload".

"A file is a copy of a file from a remote host to your own computer; To "upload" a file is to copy the file from your computer to a remote host. In the language of the Internet, the user can upload (**) files to (from) the remote host through the client program.

Answer]: a, b, c

Computer networks can be divided into local area networks, metropolitan area networks, and wide area networks according to the geographical scope, and the Internet is a kind of first key to the wide area of the network.

Answer]: There are two commonly used classification methods for computer networks: According to the classification of local transmission technology, it can be divided into broadcast network and point-to-point network.

Kiriga is classified according to geographical scope, which can be divided into local area network (LAN), metropolitan area network (MAN), and wide area network (WAN).

Answer]: There are two commonly used classification methods for computer networks: According to the transmission technology, it can be divided into broadcast network and point-to-point network.

Resale Hands can be classified according to geographical scope and can be divided into local area network (LAN), metropolitan area network (MAN) and leakage wide area network (WAN).

Answer]: a, b, d

According to the geographical scope of coverage, the computer network can be divided into three categories: local area network, metropolitan area network and wide area network. Classified by communication**, computer networks can be divided into wired networks and wireless networks.