What are the two important functions of computer networks?

Two important functions: 1. 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 computer and Data information transfer between computers, computers and terminals, and terminals. 2. Resource sharing, that is, multiple users share the hardware, software and data resources in the computer system, which can improve the utilization of equipment, avoid repeated investment in equipment, and also make full use of existing information resources and reduce the time spent in the software development process. labor and avoid repeated construction of large databases.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Computer network refers to the connection of multiple computers and their external devices with independent functions in different geographical locations through communication lines. Under the management and coordination of network operating systems, network management software and network communication protocols , a computer system that realizes resource sharing and information transfer.

Computer networks are mainly interconnected by some general-purpose, programmable hardware that is not designed to achieve a specific purpose (for example, transmitting data or video signals). These programmable hardware can be used to transfer many different types of data and support a wide and growing number of applications.

Two important functions of computer networks

1. Data communication

Data communication is One of the most important functions of computer networks. 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.

2. Resource sharing

Resource sharing is one of the main purposes for people to establish computer networks.

In a network, multiple computers or multiple users on the same computer, usually the resources required by multiple users at the same time always exceed the number of actual physical resources of the system, but logical (or virtual) resource allocation is used , realizing resource sharing can better handle this contradiction, thereby improving the efficiency of computer use.

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.

Two basic principles of resource sharing:

• 1. The law of large numbers:

  The law of large numbers says: If the number of users is very Large, and their resource usage requirements are sudden and random. When all users are considered as a whole, the user's overall resource usage requirements become quite smooth, stable, and predictable.

• 2. Economies of scale

  Economies of scale say: when the resources and the number of users in a system increase in proportion at the same time, within a certain range, The larger the size of the system, the more economical the system is.

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