IMP most likely refers to "Interface Message Processor." These were the packet switches that formed the ARPANET, the precursor to the Internet. They were dedicated computers that interconnected hosts on different networks, forwarding packets based on destination addresses. IMPs were crucial for the development of reliable and efficient data communication over long distances. Each IMP acted as a node in the network, receiving packets from connected hosts or other IMPs, and forwarding them to their destination based on routing algorithms. The modern equivalent is a router.
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