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WHAT IS KNOWN AS THE ARAPANET?

The Advanced Research Projects Agency Computer Network, known as the ARPANET, was the first large-scale interconnection of dissimilar mainframe computers. It demonstrated that packet switching of data was more appropriate for computer to computer
communication than telephone-like circuit switching and it
established a tradition of collaborative computer science
research and open documentation that set the basis for the Internet.
 
The ARPANET began at the end of 1969 as a four node experiment to achieve resource sharing and to serve as a test bed for computer communication research. That beginning came after six years of active preparation by the computer science community.


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