The earliest computer network

The earliest computer network was the ARPANET. ARPANET, or "Advanced Planning Agency Network", was developed in October 1968 as the first operational packet-switching network in the world, the originator of the global Internet, by the U.S. Department of Defense's Advanced Planning Agency (ADP) under contract to BBN. ApaNet was the world's first operational packet-switching network developed by the U.S. Department of Defense Advanced Research Projects Agency (DARPA), the earliest computer network, and the originator of the global Internet.In October 1968, the U.S. Department of Defense Advanced Planning Agency (DARPA) and BBN signed a contract for the development of a network suitable for computer communications. In June 1969, the first phase was completed, and a four-node experimental network, called ARPAnet, was recognized as the world's first network using packet-switching technology.In the summer of 1975, ARPAnet ended its experimental phase, and the control of the network was handed over to the U.S. Department of Defense, Bureau of Communications (DCA), which set up the U.S. Defense Data Network (DDN) on the basis of ARPAnet. Defense Data Network (DDN) based on ARPAnet.