| Tasks
of OSI layers: |
| 7. Application |
| User application |
| Compression & coding |
| 6. Presentation |
| Dialogue control |
| 5. Session |
| End-to-end flow &
error control |
| 4. Transport |
| Switching
& routing |
| 3. Network |
| Link-layer flow &
error control |
| 2. Data Link |
| Multiplexing &
transport of bits |
| 1. Physical |