How are the four stages of computer network development divided?

Four stages of computer network development: the first generation of computer network-the online stage of remote terminal; The second generation computer network-computer network stage; The third generation of computer networks-the interconnection stage of computer networks; The Fourth Generation Computer Network-Internet and Information Superhighway Stage.

1, the first stage: the combination of computer technology and communication technology has formed a primary computer network model. The main purpose of network application at this stage is to provide network communication and ensure network connectivity. Strictly speaking, the current network is still a variant of multi-user system.

2. The second stage: on the basis of computer communication network, realize a computer network with complete network architecture and protocols. The main purpose of network application at this stage is to provide network communication, ensure network connectivity and share network data and network hardware equipment. The milestone of this stage is the ARPANET network of the US Department of Defense.

3. In the third stage, the computer solved the standardization problem of computer networking and interconnection, and put forward the "Open System Interconnection Reference Model (OSIRM)" which conforms to the international standards of computer networks, thus greatly promoting the development of computer network technology. At this stage, the network application has developed into an information service era that provides information and services for enterprises.

4. The fourth stage: the computer network is developing in the direction of interconnection, high speed, intelligence and globalization, and it is rapidly popularized, realizing the wide application of globalization. The representative work is the Internet.

Extended data:

Computer network type:

1, LAN

(local area network) Usually our common "LAN" refers to the local area network, which is our most common and widely used network. With the development and perfection of the whole computer network technology, LAN has been fully applied and popularized. Almost every unit has its own local area network, and some even have their own small local area network at home.

Step 2: Men

(MetropolitanAreaNetworkMAN) This kind of network is generally the interconnection of computers in a city, not in the same geographical area. Most metropolitan area networks use ATM technology as the backbone network. ATM is a high-speed network transmission method for data, voice, video and multimedia applications.

3. Wide area network

This kind of network, also called long-distance network, covers a wider area than people. Generally, it is the interconnection of local area network or metropolitan area network between different cities, and the geographical range can range from several hundred kilometers to several thousand kilometers.

4. Internet

Internet, English is Internet, also known as Internet, belongs to the field of media. It refers to a huge network in series between networks, which are connected by a set of common protocols to form a logically single huge international network. The Internet began in 1969 in the United States. The general Internet refers to the general Internet, and the Internet refers to the special Internet.

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