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The route that the packet took would be unimportant. Basically, the packet would be tossed like a hot potato from node to node, until it ended up in the proper place.If big pieces of the network had been blown away, that simply wouldn’t matter.Each packet would begin at some specified source node, and end at some other specified destination node.
In 1984 the National Science Foundation got into the act.
Furthermore, they would design it to operate while in tatters. All the nodes in the network would be equal in status, each with its own authority to originate, pass and receive messages.
The messages themselves would be divided into packets.
The ARPA’s original software for communication was known as NCP, “Network Control Protocol”, but as time passed and the technique advanced, NCP was superseded by a higher-level, more sophisticated standard known as TCP/IP.
This software converted messages into streams of packets at the source, then reassembled them back into messages at the destination.
RAND mulled over this grim puzzle in deep military secrecy, and arrived at a daring solution.