The top three layers are usually implemented in software as part of the Operating System.
|
Layer |
Where it is implemented |
|
7 – Application |
Software |
|
6 – Presentation |
Software |
|
5 – Session |
Software |
The bottom three layers are usually implemented in hardware within network devices, such as switches, routers, and firewalls.
|
Layer |
Where it is implemented |
|
3 – Network Layer |
Hardware |
|
2 – Data Link |
Hardware |
|
1 – Physical |
Hardware |