During the 1970s several computer engineers working at various research institutions came up with the idea of using telecommunications technologies to link their computers together. This effort, the forefather of the modern Internet, was known as the ARPANET (Advanced Research Projects Agency Network). Originally, the ARPANET consisted of only four nodes located at the University of California - Los Angeles, the University of California - Santa Barbara, the Stanford Research Institute, and the University of Utah. The first ARPANET link was established between UCLA and SRI on November 21, 1969. By December 5, 1969, the entire 4-node network was connected.