What is the goal of a computer network?

The goal of computer networks is to achieve "resource sharing and information transmission." Computer network refers to connecting multiple computers and their external devices with independent functions in different geographical locations through communication lines to achieve resource sharing and information transfer under the management and coordination of network operating systems, network management software and network communication protocols. computer system.

Resource sharing

Resource sharing means that multiple users share hardware and software resources in the computer system. In the network system, the main resources that end users can share include processor time, shared space, various soft equipment and data resources, etc. Resource sharing is one of the main goals achieved by computer networks.

In a network, multiple computers or multiple users on the same computer use hardware and software resources at the same time. Usually, the resources required by multiple users at the same time always exceed the number of actual physical resources of the system. However, using logical (or virtual) resource allocation to realize resource sharing can better handle this contradiction and improve the efficiency of computer use. But it must be coordinated and managed by the operating system to avoid chaos. There are two main methods: unified management and distribution by the operating system, which is suitable for multiple users in the same computer system; users notify each other, which is suitable for network systems.

Information transmission

Information transmission is to transmit command or status information from one end to the other end through the channel and be received by the other end. Includes transmission and reception. There are two types of transmission media: wired and wireless. Wired is a telephone line or a special cable; wireless uses radio, microwave and satellite technologies. Information cannot be changed during information transmission, and the information itself cannot be transmitted or received. There must be a carrier, such as data, language, signal, etc., and there must be a common interpretation of the carrier on the transmitting and receiving sides.

Information transmission includes transmission in time and space. The transmission of time can also be understood as the storage of information. For example, Confucius' thoughts have been spread to the present through books. It breaks through the limitations of time and is transmitted from ancient times to modern times. Spatial transmission is what we usually call information transmission. For example, we use language to communicate face-to-face, chat on the phone or social tools, send emails, etc. It breaks through the limitations of space and is transmitted from one terminal to another. . We mainly introduce information transmission in the telecommunications field.

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