| Encapsulation |
| application |
| 7 |
| Host A |
| packets |
| Host B |
| 7 |
| presentation |
| 6 |
| : |
| 6 |
| session |
| 5 |
| : |
| 5 |
| transport |
| 4 |
| header |
| data |
| 4 |
| network |
| 3 |
| header |
| data |
| 3 |
| data
link |
| 2 |
| header |
| data |
| 2 |
| physical |
| 1 |
| data |
| 1 |
| network |