Computer Network Functions and Classifications_Shang ping China focuses on high quality website construction

Computer network function

1. Data exchange and communication

Data, programs, or files can be quickly and reliably transferred between computers in a computer network or between computers and terminals. For example, e-mail can enable remote users thousands of miles away to communicate with each other quickly and accurately; Electronic data interchange (EDI) can be implemented in the business sector or Beijing website construction Safe and accurate exchange of business documents such as orders, invoices and receipts between companies; File Transfer Protocol (FTP) can realize the real-time transfer of files, providing a powerful tool for users to copy and find files.

2. Resource sharing

Making full use of the resources (including hardware, software and data) provided in the computer network is one of the main goals of the computer network. Many resources of the computer are very expensive and cannot be owned by every user. For example. Giant computers, mass memory, high-speed laser printers, large plotters, some special peripherals, etc. for complex operations, in addition, there are large databases, large software, etc. These expensive resources can be shared by users on the computer network. Resource sharing can not only reduce users' investment, but also improve the utilization of these computer resources.

3. Improve system reliability

In some occasions where computer real-time control and high reliability are required, the backup technology realized through computer network can improve the reliability of computer system. When a computer fails, another computer in the computer network can take the place of it to complete the task. For example, air traffic management, industrial automation production line, military defense system, power supply system, etc. can be set with backup or replacement computer systems through computer networks to ensure the safety and reliability of real-time management and uninterrupted operation systems.

4. Distributed network processing and load balancing

For large tasks or when the task load of a computer in the network is too heavy, the task can be distributed to other computers in the network. This can not only handle large tasks, so that a computer will not be overloaded, but also improve the availability of the computer, playing the role of distributed processing and load balancing.

Computer network classification

Computer networks have different classification methods. The following describes the types of computer networks according to common classification methods:

(1) According to the scope of network coverage, computer networks can be classified into WAN, LAN, MAN, etc. Wide area network (WAN) usually covers more than tens of kilometers, and is characterized by large scale and large transmission delay. Local area network (LAN) coverage is usually within several thousand meters, limited to the internal units or buildings, with the characteristics of small scale, dedicated, and small transmission delay. The metropolitan area network (MAN) generally covers a city, which is between the LAN and WAN. WAN technology is used for networking.

(2) According to the network transmission medium, computer networks can be divided into wired networks and wireless networks. The network connected by wired media is called wired network. Common wired transmission media include twisted pair, wire and optical fiber. The network connected by wireless media is called wireless network. At present, wireless network mainly adopts three technologies: microwave communication, infrared communication and laser communication.

(3) According to the network topology, computer networks can be divided into bus networks, star networks, ring networks, tree networks and mesh networks. Bus network is a bus topology structure that connects all nodes to a coaxial cable. A network composed of multiple nodes connected to a central node is called a star network. A ring network is a closed loop formed between nodes. If a node of a star network is connected to another switch or hub, it forms a tree network with branches. Mesh network is characterized by more paths between nodes. Multiple routes can be selected for data transmission.
This article was published in UEO Marketing website construction Company Shangpin China //ihucc.com/

Computer network function and classification

Date：2013-08-24 Source: Shangpin China Type: website encyclopedia
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