A joint ISO/ITU-T standard [I7498-1] for a seven-layer, architectural communication framework for interconnection of computers in networks. (See: OSIRM Security Architecture. Compare: Internet Protocol Suite.)
A joint ISO/ITU-T standard [I7498-1] for a seven-layer, architectural communication framework for interconnection of computers in networks. (See: OSIRM Security Architecture. Compare: Internet Protocol Suite.)
Tutorial: OSIRM-based standards include communication protocols that are mostly incompatible with the IPS, but also include security models, such as X.509, that are used in the Internet.
The OSIRM layers, from highest to lowest, are (7) Application, (6) Presentation, (5) Session, (4) Transport, (3) Network, (2) Data Link, and (1) Physical.
Usage: This Glossary refers to OSIRM layers by number to avoid confusing them with IPS layers, which are referred to by name.
Some unknown person described how the OSIRM layers correspond to the seven deadly sins:
John G. Fletcher described how the OSIRM layers correspond to Snow White's dwarf friends:
Doc: Application acts as if it is in charge, but sometimes muddles its syntax.
Sleepy: Presentation is indolent, being guilty of the sin of Sloth.
Dopey: Session is confused because its charter is not very clear.
Grumpy: Transport is irritated because Network has encroached on Transport's turf.
Happy: Network smiles for the same reason that Transport is irritated.
Sneezy: Data Link makes loud noises in the hope of attracting attention.
Bashful: Physical quietly does its work, unnoticed by the others.