1966: First experiments in digital packet switched technology.
1968: ARPA issues RFQ for IMPs. (AT&T says it'll never work.)
1969: ARPANET inaugurated with 4 hosts.
1975: ARPANET has 100 hosts; operational responsibility passed to DCA.
1977: 4-network demonstration of ARPANET, SATNET, Ethernet, and PRnet.