The two main technologies included in network technology are computer technology and communication technology. Computer network refers to a system that interconnects multiple computer systems in different geographical locations and their external networks through communication media, and realizes resource sharing and information transmission under the management and coordination of network operating systems, network management software and communication protocols.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
The two main technologies included in network technology are computer technology and communication technology.
Computer network technology is the product of the combination of communication technology and computer technology.
A computer network is a collection of scattered and independent computers on the earth that are connected to each other according to network protocols. The connection medium may be cable, twisted pair, fiber optic, microwave, carrier wave or communications satellite. Computer networks have the function of sharing hardware, software and data resources, and have the ability to centrally process, manage and maintain shared data resources.
Computer network includes two parts: computer and network. Computer, also known as electronic computer, is a modern intelligent electronic device that can run according to a program and process massive amounts of data automatically and at high speed. A computer that is composed of hardware and software and does not have an operating system installed is called a bare metal computer. Common forms include desktop computers, laptop computers, large computers, etc., and more advanced computers include biological computers, photon computers, quantum computers, etc. The network uses physical links to connect isolated workstations or hosts to form data links, thereby achieving the purpose of resource sharing and communication.
Function of computer network
1. Data communication
Data communication is one of the most important functions of 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.
2. 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.
3. 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.
4. 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.
5. 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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