⁸ DARPANet and ARPANet are the two revolutionary projects sponsored by the U.S. Department of Defense. DARPA-Net is the origin of ARPANet project. The aim of the DARPANet project was to exchange military information among analysts, scientists, and researchers located at different geographical locations of the United States. The ARPANet project was launched by DOD sometime in the late 1960s. The network infrastructure for this project was created by the U.S. Defense Advanced Research Project Agency (ARPA). The idea of ARPANet was to set up an experimental wide area network within the United States to survive the military exigencies.