| A | B |
|---|
| Application | interface to the user. supports file transfer, network management. first layer used when a packet is created |
| Presentation | provides useful transformations on data to support an application interface and general communications services. Example: converts text from ASCII into Extended Binary Coded Decimal Interchange Code (EBDIC) |
| Session | Establishes, manages and terminates connections (sessions) among cooprerating applications. Also adds traffic flow information |
| Transport | Provides reliable, transparent transport between end points (source and destination hosts) |
| Network | Organizes data into datagrams (packets). Provides reliable addressing services. Ensures that datagrams are forwarded and routed to their destinations |
| Data link | Provides reliable data transfer across the physical link. Prepares the information so it can be placed on the transmission medium such as a copper wire |
| Physical | Associated with transmission of unstructured bit streams over a physical link. Responsible for the mechanical, electrical and procedural characteristics that establish, maintaina nd deactivate the physical link |
| Wild Card | Wild Card |
