1. Briefly describe the composition and main functions of computer network

1. Briefly describe the composition and main functions of computer network

The composition of computer network basically includes: computer, network operating system, transmission medium (can be tangible or intangible, such as the transmission medium of wireless network is air) and corresponding application software
There are four main functions of computer network, the most basic function is resource sharing and data communication
(1) Resource sharing
Resource sharing is one of the main purposes for people to establish computer network. Computer resources include hardware resources, software resources and data resources. Sharing of hardware resources can improve the utilization rate of equipment and avoid repeated investment of equipment. For example, using computer network to establish network printer. Sharing of software resources and data resources can make full use of existing information resources, Reduce the labor in the process of software development and avoid the repeated setting of large database
(2) Data communication
Data communication refers to the use of computer networks to achieve data transmission between computers in different geographical locations. For example, people send and receive information through e-mail, use IP phones to talk with each other and so on
(3) Load balancing and distributed processing
When a computer system in a computer network is overloaded, it can transfer its tasks to other computer systems in the network to improve the utilization rate of the whole system, The task is distributed to different computer systems in the network for distributed processing, such as analyzing the sound of space beyond the earth through computers in the Internet
(4) Integrated information service
In today's information society, all walks of life have to produce a lot of information, which needs to be processed in time, and the computer network plays a very important role in it