Resources
OSI
Open system interconnection. A seven layered model of communications networks defined by ISO. The seven layers are:
Layer 7 Application: provides the interface for application to access the OSI environment.
Layer 6 Presentation: provides for data conversion to preserve the meaning of the data.
Layer 5 Session: provides user to user connections.
Layer 4 Transport: provides end to end reliability.
Layer 3 Network: provides routing of data through the network.
Layer 2 Data Link: provides link access control and reliability.
Layer 1 Physical: provides an interface to the physical medium.