Briefly describe what is a computer network?

Computer network refers to a system that connects dispersed computer devices to achieve information transmission. Computer network refers to connecting multiple computers and their external devices with independent functions in different geographical locations through communication lines to realize resource sharing and information under the management and coordination of network operating systems, network management software and network communication protocols. Delivery computer system.

Computer network (a system that connects dispersed computer devices to achieve information transfer)

Computer network refers to connecting multiple computers and their external devices with independent functions in different geographical locations through communication lines to realize resource sharing and information under the management and coordination of network operating systems, network management software and network communication protocols. Delivery computer system.

Composition

The classification of computer networks is the same as the general classification of things. It can be classified according to the different properties and characteristics of things (that is, the attributes of things). In layman's terms, a computer network is composed of multiple computers (or other computer network devices) physically (or logically) connected together through transmission media and software. In general, the computer network basically consists of four parts: computer, network operating system, transmission medium (which can be tangible or intangible, such as the transmission medium of wireless network is space), and corresponding application software.

Function

• Data communication

  Data communication is one of the most important functions of a computer network. Data communication is a communication method and communication service that uses data transmission technology to transfer data information between two terminals according to a certain communication protocol. It can realize the transmission of data information between computers, computers and terminals, and terminals. It is the third largest communication service after telegraph and telephone services. The information transmitted in data communication is expressed in the form of binary data. Another characteristic of data communication is that it is always connected with telematics. It is a generalized information processing including scientific computing, process control, information retrieval, etc.

• Resource sharing

  Resource sharing is one of the main purposes for people to establish computer networks. Computer resources include hardware resources, software resources and data resources. The sharing of hardware resources can improve the utilization of equipment and avoid repeated investment in equipment, such as using computer networks to establish network printers; the sharing of software resources and data resources can make full use of existing information resources, reduce labor in the software development process, and avoid Repeated construction of large databases.

• Centralized Management

  The development and application of computer network technology has caused changes in modern office methods, business management, etc. At present, there are many management information systems, office automation systems, etc., through which centralized management of daily work can be achieved, work efficiency can be improved, and economic benefits can be increased.

• Realize distributed processing

  The development of network technology makes distributed computing possible. For large-scale topics, they can be divided into many small topics, which are completed by different computers respectively, and then concentrated together to solve the problem.

• Load balancing

  Load balancing means that work is evenly distributed to each computer system on the network. The network control center is responsible for distribution and detection. When a computer is overloaded, the system will automatically transfer the load to a lighter computer system for processing.

  It can be seen that computer networks can greatly expand the functions of computer systems, expand their application scope, improve reliability, provide convenience to users, and at the same time reduce costs and improve performance-price ratio.

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