How Many Computer Made Up The First Internet
The very first form of Internet was ARPANET. It was a subnet which was originally designed by Wesley Clark, a researcher, and was implemented by the BBN a consulting firm. ARPANET is named after a research organization ARPA (Advanced Research Projects Agency) whose director Larry Roberts bought the idea proposed by Wesley Clark.
The ARPANET was built by connecting four computers in four different institutes named UCLA, UCSB, SRI, and the University of Utah. These four computers were connected by using 56kbps transmission lines. These computers were called Interface Message Processors (IMPs). For high reliability each of the four IMPs were connected to at least two more IMPs. ARPANET was the first subnet and used the datagram message format to transmit messages. The principle design which was used in this subnet was packet-switching, which is the Internet Protocol being used in today’s Internet. The significance of this principle lies in the fact that even if one or more connection gets destroyed the connection between the computers will still be maintained. The messages would take alternative route to travel to its destination.
The ARPANET was implemented by BBN when ARPA director Larry Roberts awarded them the contract. BBN was consulting firm based in Cambridge, Massachusetts. BBN selected Honeywell DDP-316 minicomputers for the ARPANET. These minicomputers were specially modified for the subnet and did not have any disks as disks were considered unreliable. These minicomputers used 12 16-bit words of core memory.
The ARPANET was displayed publicly for the first time in 1972 and soon it started growing massively. More and more computers were getting connected to the ARPANET and soon it spanned the United Sates of America.
“About one - two years after the first online demo of how "actually let the public come in and use the ARPANET, running applications all over the U.S …." (Vinton Cerf) the NET became really busy especially "every Friday night" (Bob Bell)” (source: http://www.netvalley.com/cgi-bin/intval/net_history.pl?chapter=1)
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