Defense Advanced Research Projects Administration (DARPA) Net

The first version of an IP based network was funded by the US Department of Defence in 1969 as a means of communicating with defence contractors and universities doing military research. Robustness was provided over the imperfect network by packet switching technology, developed by another DoD engineer Paul Baran, as a means of ensuring failure resistant communications. The myth still persists that the Arpanet was invented to make a nuclear counter strike possible amid post-apocalyptic devastation. However, this has more to do with retrospective fantasies about the Cold War than with the reality of internet history. The illustration is part of one of the first skethches of the network architecture, showing one host and one node, from September 1969.
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