The transmission of information in computer networks is based on "words"; words are the basic unit of data transmission. Computer networks have two main functions: data communication and resource sharing, and the information transmitted in data communication is expressed in the form of binary data. 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.
The operating environment of this article: Windows 7 system, Dell G3 computer.
Transmitting information in a computer network usually uses words as the basic unit.
Word is the basic unit of transmission
Byte is the basic unit of data processing and the smallest unit of storing information
Bit is the smallest unit of storage
Bit is the smallest unit of computer storage; 1 byte is composed of 8 adjacent binary bits, which is The basic unit in computer storage and also the basic unit in data processing. A word is a set of binary numbers that are used as a unit when the CPU accesses, processes and transmits them through the data bus at one time. Word length is the number of bits contained in each word.
Expand knowledge
Computer network refers to multiple computers with independent functions in different geographical locations and their peripheral devices, through communication lines Computer systems that are connected to realize resource sharing and information transmission under the management and coordination of network operating systems, network management software and network communication protocols.
Function of computer network:
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 remote information processing, which is a broad term including scientific computing, process control, information retrieval, etc. information processing.
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 and price. Compare.
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