| A | B |
|---|
| Physical | Layer 1-defines physical and electrical characteristics of the network |
| Data Link | Layer 2-defines the access strategy for sharing the physical medium including data link and media access issues. |
| Network | Layer 3-providing a means for communicating open systems to establish, maintain and terminate network connections. |
| Transport | Layer 4-Where TCP lives.. The transport layer relieves the Session Layer of the burden of ensuring data reliability and integrity. |
| Session | Layer 5-It provides for two communicating presentation entities to exchange data with each other. |
| Presentation | Layer 6-The application data is either packed or unpacked, ready to use by the running application |
| Application | End-user and end-user application protocols such as telnet, ftp and mail |
| APSTNDP | Sentence for remembering layers: All People Seem To Need Data Processing |
