Open Systems Interconnection (OSI) Model

The Open Systems Interconnection (OSI) model is a logical reference model developed by the International Organization for Standardization (ISO). The OSI model separates networking into logical layers. These layers are:

For a contrasting system, see the TCP/IP model.

References:

http://alphamike.tamu.edu/web_courses/cpsc463/notes/OSI.pdf

http://www.petri.co.il/osi_concepts.htm