(2) The concepts of resource subnet and communication subnet network structure are put forward. ?
(3) The packet switching method is studied.
(4) Adopting hierarchical network architecture model and protocol system.
Extended data:
ARPANET is the world's first packet-switched network developed by the Advanced Research Projects Agency of the US Department of Defense. It is the ancestor of the global Internet.
background
In a sense, the internet can be said to be the product of the cold war between the United States and the Soviet Union. In the United States, the 1960s was a very special era. In the early 1960 s, the Cuban nuclear missile crisis occurred and the cold war between the United States and the Soviet Union warmed up. The threat of nuclear annihilation has become a topic in people's daily life. At the same time that the United States blocked Cuba, the Vietnam War broke out and political crises occurred in many third world countries.
Due to the stimulation of American federal funds and the influence of public fear, the "cold war in the laboratory" also began. People think that maintaining the leading position in science and technology will determine the outcome of the war.
The progress of science and technology depends on the development of computer field. By the end of 1960s, every major federally funded research center, including purely commercial organizations and universities, had the latest computer equipment provided by the emerging computer industry in the United States. The idea of sharing data among computer centers is developing rapidly.
Baidu Encyclopedia-Apa.com