| OSI Model | |||
|---|---|---|---|
| Data unit | Layer | Function | |
| Host layers | Data | 7. Application | Network process to application |
| 6. Presentation | Data representation and encryption | ||
| 5. Session | Interhost communication | ||
| Segments | 4. Transport | End-to-end connections and reliability (TCP) | |
| Media layers | Packets | 3. Network | Path determination and logical addressing (IP) |
| Frames | 2. Data link | Physical addressing (MAC & LLC) | |
| Bits | 1. Physical | Media, signal and binary transmission | |
Sep 26, 2007
OSI
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