• . . . . . '.Mi WPf" Report No. 4799 Bolt Beranek and Newman Inc. 1 . HISTORY The DARPA Computer Network, or ARPANET as it has come to be called, consists of IMPs, lines, and hosts as shown in Figure 1. The IMPs (short for Interface Message Processors) are small, special-purpose computers… … Figure 1 — IMPs, Lines, and Hosts used for a variety of applications. The IMPs provide a communications subnetwork through which hosts communicate with each other, much as the commercial telephone system provides a III-2
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