Unrestricted.2016-11-142011-02-182016-11-141986-05http://hdl.handle.net/2346/16214Communications, the transfer and flow of information that is intelligible to people, is the key to development in science and technology. Scientific innovations have continuously improved the standard of living of individuals and the society as a whole. One of the greatest influences on the workplace and the society during the second half of the 20th century is the computer. Originally it was thought to be of use only for jobs in scientific research establishments. Soon it was applied to manipulation of business information with outstanding success. The computer technology explosion is not abating yet. New vistas into research, development and applications are opening, resulting in widespread use of computers.application/pdfengLocal area networksThesis