DATA COMMUNICATION Lecture-9.

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Presentation transcript:

DATA COMMUNICATION Lecture-9

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

Overview of Lecture 9 Functions of Layers

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

Transport Layer

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

Transport Layer Example

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

Functions of Session Layer Dialog Control Synchronization

Session Layer

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

Presentation Layer

Summary The OSI Model Functions of Layers

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