Protocol Layering

8/17/97


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Table of Contents

Protocol Layering

Peer entities

Protocols

Example

What does a protocol tell us?

Another way to view a protocol

Protocol layering

Some terminology

Protocol stack

The importance of being layered

Problems with layering

Layering

ISO OSI reference model

ISO OSI

The seven layers

Physical layer

Datalink layer

Datalink layer (contd.)

Network layer

Network layer (contd.)

Two types of network layers

Network layer

Transport layer

Transport layer (contd.)

Transport layer (contd.)

Session layer

Example

Presentation layer

Application layer

Layering

Why seven layers?

Author: S. Keshav

Email: skeshav@cs.cornell.edu

Home Page: http://www.cs.cornell.edu/home/skeshav

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