1. – Layered Architecture By: Abid Shahzad Aslam

4. An example Sending a letter

7. ISO is the organization. OSI is the model. Note

8. OSI Model Physical Data Link Network Transport Session Presentation Application

9. Peer-to-Peer Process

10. An exchange using the OSI model

12. Physical Layer

13. The physical layer is responsible for movements of individual bits from one hop (node) to the next. Note

15. Data Link Layer

16. The data link layer is responsible for moving frames from one hop (node) to the next. Note

18. Network Layer

19. The network layer is responsible for the delivery of individual packets from the source host to the destination host. Note

21. Transport Layer

22. The transport layer is responsible for the delivery of a message from one process to another. Note

24. The session layer is responsible for dialog control and synchronization. Note

26. The presentation layer is responsible for translation, compression, and encryption. Note

28. The application layer is responsible for providing services to the user. Note

29. Summary of layers

30. OSI Layers

31. OSI Layers

32. The OSI Environment

33. The OSI Environment