The document discusses the 7 layers of the OSI model, with each layer adding headers or trailers to data as it passes through - the physical layer is the lowest layer dealing with transmission of raw data, followed by the data link layer, network layer, transport layer, session layer, presentation layer, and application layer as the highest layer of data exchange between applications.

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