The second generation, resources and communication subnet separate subnets more interconnected network host; The third generation, packet switching network; The fourth generation to OSI, as a representative of the standardization of the network; The fifth generation, in the Internet, driven to TCP/IP based, with optical fiber

As the main communication medium, and a lot of multimedia integration business network.

(two of the history of the Internet

In fact, the Internet is entirely based on network technology, is the development of network a necessary process. It is hard to put the Internet and the development of the network quite apart from history.

What is the Internet?

The Internet is an international collection of communication network, it combines modern communication technology and the modern computer technology in a body, the computer is between information exchange and international real now the resources sharing of good means. The Internet will all kinds of physical network to connect, make a whole, regardless of the similarities and differences of network type on the size of the geographical position and the difference, so accurate account of the Internet is: is a network of networks.

From the early APRAnet Internet web development, at the same time PA3382U-1BAS battery APRAnet up on packet switching technology and network interconnection technology research, and led to the emergence of the TCP/IP and development.

TCP/IP protocol is an important foundation of the Internet. Along with the rapid development of the Internet,

TCP/IP network technology in the influence of the field is more and more extensive, at present has become the DE facto standard.

TCP/IP application range is very wide, not only applicable to mainframes, also suitable for small machine and the PC and can be used not only to local area network, can also be used to the wan. In principle, any computer program as long as abide by the TCP/IP protocol, according to certain rules can access the Internet.

Is the so-called “the gander”, long-term since science and technology researchers sought to establish a unified network architecture, using an agreement to complete the task of communication system all eyes are standard TCP/IP based push forward, maybe 10 or 20 years later, will be implemented.

In the 1990 s, the computer technology, communication technology as well as based on the computer and network project based on the technology of computer network technology has developed rapidly. Especially, in 1993 the United States announced the establishment of national information infrastructure NII, many countries around the world have set their own NII and build, thus greatly promoted the development of the computer network technology, art computer network enters a new phase.

At present, the in the United States, for the core of high-speed computer network that the Internet has been formed, the Internet has become the most important by the human, the largest knowledge base. The U.S. government and respectively in 1996 and 1997 to investigate more rapid development of the Internet 2 (Internet2 reliable; and the Next Generation of the Internet (Next Generation Internet).

Can say, the network interconnection and high-speed computer network is becoming the latest generation of computer network the development direction of the network.

Here are the Internet can be roughly development process: and in 1983, TCP/IP become APRAnet standard communication protocol, on the sign

The real meaning of Internet appeared. And in 1984, the national science DV4 battery foundation began to infuse capital create NSFnet (national division

Learn fund nets, some of the major improvement for Internet provides funding. And in 1986, the U.S. national science foundation in the United States, with the support of the government, renting telecommunications companies communication lines has formed a new Ineternet backbone network, one country learn foundation network (NSFnet), was used to connect six super computer in the heart and the United States, colleges and institutes and academic institutions.

In 1989, at the same time, dissolved NCP is open to the public, so as to become

The most important communication for Internet backbone network. Throughout the 1980 s, | Internet sustainable development. Here’s worth remembering, the Internet is although had all the: many, but global nets fans (World Wide Web) did not appear, still can’t on the Internet freedom, can’t see picture, click on the download them and unless graphics program to open them. An important development has made, and people can search and retrieval information classification, the famous Archie method is “Gopher and Veronica), in January 1992, because of the number of users have written claw has increased dramatically, connected institutions of growing, the fields of application, gradually expand Internet association (ISOC) born child prodigies, it is a spontaneous users of the organization to make 10 remember printed a related standard must and the popularity of the Internet to promote goal; At the same time, the business community and communication industry beginning open Internet, pay attention to the commercialization of Internet growing calls. Or in 1992, when CERN (formerly of the European particle physics set laboratory) physicist Tim Berners Lee-invented the global network to help its physical XueYan investigate, big turn finally came. Tim Berners Lee was just for yourself-use and invented the nets, but soon it then began to spread like wildfire. More than 86? The use of a called the SGML markup language of composition, make web page formatting and contains hypertext links to become possible. No matter whether you know computer language, you can use Internet browser in the world roam. Click on information In 1993, Marc Andreesen and he in national supercomputing applications center

(NCSA) companions invented the first strong online browser, called Mosaic. Mosaic can view graphics, playing sounds, use Gopher, FTP, E-mail and news groups, this is to use the Internet all-in-one solution, with beautiful pictures. The rest of the things, it is indeed browser has evolved to history can handle audio and video and flow of all kinds of other modern function. This can make you feel about network in the 1980 s and 90 s, according to the development of Hobbes’ Internet Timeline, the Dell 9200 battery number of Internet host (especially the number > computer connected to the Internet from 1984 in 1000 to over 1992 in 1 million, and by 1997 the breakthrough 16 million.

The Internet in the last few years of the 20 th century with amazing pace, and development, with the modem speed increases, many Internet practical applications use with wide amount of larger with bandwidth (via the Internet and telephone line is the flow of information. A similar video and audio such application tied up a lot bandwidth). As soon as possible 1995, the national foundation announced and MCI cooperation construction plan of high speed data channels, providing 155 Mb/s high-speed backbone service (vBNS) to replace the existing NSFnet, each big communications company have also announced his Internet Internet plan. The age of the network that coming.