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IMP (Interface Message Processor)

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Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

An IMP was a device used to connect the original Internet (then called the ARPANET). It was the precursor to today's routers. The IMP shielded the host computer (back in those days, the ARPANET was a network of mainframes). The IMP handled all the communications (message routing) between the hosts and, therefore, formed the network.

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