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was a research project that was funded by the military and the only network it was connected to was the University of Untah, but they also had 3 reaseach centers in California
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Arpanet had expanded to 13 nodes by the end of 1970, even to some schools on the east coast like Havard, and MIT. BBN was the name of the engeneeering company that did the work to build Arpanet, each Arpanet site had a router that was called the "Interface Message", it cost around 82,000 or half a million dollars in todays time.
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Arpanet became international when the they made satelilite links connecting to Norway and London to other nodes in the United States, around this time the network had 40 nodes and new Arpanet applications started to emerge, email just became a thing in 1971 so they used emails to send files to each other (http://www.vox.com/a/internet-map)
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Arpanet network only had 100 nodes by 1982 and that still wasn't enough to support a vibrant onlin community. they allowed scientists who had access to the network to stay in touch. They used a new bulliten board system called Usenet which was invented in 1980, it let users swap programming tips, joke, etc (http://www.vox.com/a/internet-map)
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Arpanet was only used by the military but operaters realized that it would eventually become unmanageable if it continued to grow , so they made it a decentrailzed network of networks. so different networks would be controlled by different organizations but every network would be able to communicate using shared standards, and they would call this "Internet" (http://www.vox.com/a/internet-map)
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in 1986 they created a TCP/IP- based network called NSFNET to link those supercomputing center together and allow people around the country to use them. by 1992 there were 6,000 networks connected to NSFNET, and some of them were overseas. and everyone had access to emails, Usenet, and eventually the World Wide Web (http://www.vox.com/a/internet-map)
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"in 1993, the internet was still dominated by the United States but it was becoming a truly global network. This is a map of information flow on Usenet, an bulletin board application that allowed users to swap recipes, jokes, programing tips, and more." (http://www.vox.com/a/internet-map)
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"In 1994, the Clinton Administration privatized the inernet backbone. Commercial firms took over the job of carrying long-distance internet traffic, allowing the government-funded NSFNET to be decommissioned" (http://www.vox.com/a/internet-map)