1. DATA COMMUNICATION
Lecture-9

2. Recap of Lecture 8 Critique of the OSI Model Functions of Layers
Physical Layer
Data Link Layer
Network Layer

3. Overview of Lecture 9
Functions of Layers

4. Transport Layer
Responsible for Source-to-Destination delivery of Entire Message
Transport Layer ensures that whole message arrives at the destination intact

5. Transport Layer

6. Functions of Transport Layer
Service Point Addressing
Segmentation and Reassembly
Connection Control
Flow Control
Error Control

7. Transport Layer Example

8. Session Layer Session layer is the Network Dialog Controller
Establishes, Maintains, and Synchronizes the interaction between communicating systems

9. Functions of Session Layer
Dialog Control
Synchronization

10. Session Layer

11. Presentation Layer
Presentation layer is concerned with Syntax and Semantics of info exchange between two systems

12. Presentation Layer

13. Summary
The OSI Model
Functions of Layers

14. Suggested Reading
Section3.2 “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan