The Open Systems Interconnection (OSI) Model is a conceptual and logical layout that defines network communication used by systems open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below...
The Advanced Research Projects Agency (ARPA) was the old name for the Defense Advanced Research Projects Agency (DARPA), an agency of the U.S. government responsible for developing new technology for the military. In computing, ARPA/DARPA is best known for its involvement in networking and the early development of ARPANET, a network that many view as the starting point of the Internet.
ARPA changed its name to DARPA in 1972, then back to ARPA in 1993, then finally back again to DARPA in 1996. Its name change also sometimes causes confusion in the naming of ARPANET, who some assume changed its name to DARPANET, which is not the case.
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