Its about the 7 layers of OSI that were suggested by ISO

1. OSI Layers
T S Pradeep Kumar!
VIT Chennai!
http://pradeepkumar.org

2. 7 Layers of OSI
ISO is the organization and
OSI is a Model!
7. Application Layer
6. Presentation Layer
There are totally 7 layers !
5. Session Layer
Headers and tailers are added
at each layers !
Headers are added to the data
at the Layers 6,5,4,3,2!
Trailers are added usually at
Layer 2.
4. Transport Layer
3. Network Layer
2. Data Link Layer
1. Physical Layer

5. Physical Layer

6. Data Link Layer

7. Network Layer

8. Transport Layer

9. Session Layer

10. Presentation Layer

11. Application Layer

12. Summary of Layers