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In the early 1980s the NSF funded the establishment for national supercomputing centers at several universities, and provided interconnectivity in 1986 with the NSFNET project, which also created network access to the supercomputer sites in the United States from research and education organizations.Commercial Internet service providers (ISPs) began to emerge in the very late 1980s. Limited private connections to parts of the Internet by officially commercial entities emerged in several American cities by late 19, and the NSFNET was decommissioned in 1995, removing the last restrictions on the use of the Internet to carry commercial traffic.Packet switching networks such as the NPL network, ARPANET, Tymnet, Merit Network, CYCLADES, and Telenet, were developed in the late 1960s and early 1970s using a variety of communications protocols.The ARPANET project led to the development of protocols for internetworking, in which multiple separate networks could be joined into a network of networks.
For each of these three terminals, I had three different sets of user commands. Kleinrock subsequently developed the mathematical theory behind the performance of this technology building on his earlier work on queueing theory.Bringing in Larry Roberts from MIT, he initiated a project to build such a network.The first ARPANET link was established between the University of California, Los Angeles (UCLA) and the Stanford Research Institute at hours on October 29, 1969.Early computers had a central processing unit and remote terminals.As the technology evolved, new systems were devised to allow communication over longer distances (for terminals) or with higher speed (for interconnection of local devices) that were necessary for the mainframe computer model.