BibTeX:

@article{IJIRSTV4I3026,
     title={The OSI Model: Overview on the Seven Layers of Computer Networks},
     author={Priti V. Jasud},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={4},
     number={3},
     pages={116--124},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV4I3026.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

Due to the urgency in the need for standards for heterogeneous computer networks, International Standard Organization (ISO) created a new subcommittee for “Open System Interconnection” (ISO/TC97/SC16) in 1977. The first priority of subcommittee 16 was to develop architecture for Open System Interconnection which could serve as a frame work for the definition of standard protocols. As a result 18 months of studies and discussions, SC16 adopted a layered architecture comprising seven layers (Physical, Data Link, Network, Transport, Session, Presentation, and Application). In july 1979 the specifications of this architecture, established by SC16, were passed under the name of “OSI Reference Model” to Technical committee 97 “Data processing” along with recommendations to start officially, on this basis a set of protocols standardizations to start projects to cover the most urgent needs. These recommendations were adopted by TC97 at the end of 1979 as the basis for the following development of standards for Open System Interconnection within ISO. The OSI Reference Model was also recognized by International Telegraph and Telephone Consultative Committee (CCITT) Rapporteur’s Group on “Layered Model for Public Data Network Services”. This paper explains the OSI Reference Model, which comprises of seven different layers. Each layer having their own responsibilities.

Open System Interconnection (OSI), International Standard Organization (ISO), Protocol