Computer network is the product of the combination of computer technology and communication technology. Computer network refers to connecting multiple computers and their external devices with independent functions in different geographical locations through communication lines to realize resource sharing and information under the management and coordination of network operating systems, network management software and network communication protocols. Delivery computer system.
#The operating environment of this article: windows10 system, thinkpad t480 computer.
Computer network is the product of the combination of computer technology and communication 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.
A computer, also known as an 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, notebook 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.
So a computer network refers to the connection of multiple computers and their external devices with independent functions in different geographical locations through communication lines. In the network operating system, network management software and network A computer system that realizes resource sharing and information transfer under the management and coordination of communication protocols.
One of the functions of a computer network is: data communication
Data communication is based on a certain communication protocol and uses data transmission technology A communication method and communication service that transfers data information between two terminals. 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.
In a data communication system or computer network, the transmission channel used can be fixed or provided by the switching network. There are two main ways of data exchange: circuit switching and packet switching, of which packet switching is more commonly used in actual data networks. In a data network using packet switching, in addition to the functions required by data transmission and data link control procedures between adjacent switching nodes, the storage and storage of data packets must be completed on each switching node. Forwarding; routing selection, flow control, congestion control, user access to the network, and related network maintenance and management. Correspondingly, certain related functions also need to be implemented in the end system connected to the data switching network. All these functions related to forming a data switching network are specified in the form of communication protocols, and they also include the interface protocols between the end system and the network. The so-called agreement refers to the rules and agreements that both communicating parties must follow in order to communicate accurately and effectively. They are of great significance in data communication. The data link control procedure mentioned above is actually a data communication protocol.
Data communication protocols can be divided into two categories. One type is protocols related to data communication networks (from the perspective of computer network composition, sometimes also called communication subnets), including protocols between nodes within the network, as well as between the network and end systems. They are protocols necessary to form a data communication network and implement data communication between end systems through it. The other type is protocols between end systems. They are based on the functions implemented by the previous type of protocols, in order to realize interoperability between end systems and achieve certain application purposes, or to be precise, in order to achieve certain application purposes. A protocol necessary for communication between application processes on two end systems. All communication functions of a data communication system or computer network are generally divided and organized according to a certain hierarchical structure. Data communication protocols are actually specific provisions on the content and implementation rules of each layer's functions, so they are generally formulated by layer.
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