What did the internet develop from?
The development process of the Internet:
1. The Internet was originally developed from ARPANet. In a sense, the Internet can be said to be a product of the Cold War between the United States and the Soviet Union. In 1969, the U.S. Department of Defense's Advanced Research Projects Agency (ARPA--Advanced Research Projects Agency) began to build a network named ARPAnet to connect several military and research computer hosts in the United States. At the beginning, ARPAnet only connected four hosts. From a military requirement, it was under the protection of high-level secrets of the U.S. Department of Defense. Technically, it did not have the conditions for external promotion.
2. In 1983, ARPA and the U.S. Department of Defense Communications Agency successfully developed the TCP/IP protocol for heterogeneous networks. The University of California, Berkeley, used the protocol as part of its BSDUNIX, making the protocol It became popular in society, and the real Internet was born.
3. In 1986, the National Science Foundation (NSF) used the TCP/IP communication protocol developed by ARPAnet to establish the NSFnet wide area network based on five supercomputer centers for scientific research and education services. ARPAnet, the father of the Internet, was gradually replaced by NSFnet. By 1990, ARPAnet had withdrawn from the stage of history.
4. In 1989, the WWW was successfully developed by CERN, laying the foundation for the Internet to realize wide-area hypermedia information interception/retrieval.
5. By the early 1990s, the Internet had actually become a "network within a network" - each subnet was responsible for its own installation and operating costs, and these subnets were interconnected through NSFnet. Users are no longer limited to computer professionals, and gradually regard the Internet as a communication and communication tool, rather than just sharing the computing power of the NSFnet supercomputer.
6. In 1991, three companies in the United States operated their own CERFnet, PSInet and Alternet networks respectively, which could provide Internet networking services to customers to a certain extent. The emergence of Internet commercial service providers made industrial and commercial enterprises Enterprises can finally enter the Internet openly. Countless companies and individuals from all over the world have poured into the Internet, bringing a new leap in the history of Internet development.
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