Chapter 2

I protocolli TCP/IP 2/edBehrouz A. Forouzan

Copyright © 2005 – The McGraw-Hill Companies srl

Chapter 2Chapter 2

Upon completion you will be able to:

The OSI Model andThe OSI Model andthe TCP/IP Protocol Suitethe TCP/IP Protocol Suite

• Understand the architecture of the OSI model• Understand the layers of the OSI model and their functions• Understand the architecture of the TCP/IP Protocol Suite• Differentiate between the OSI model and the TCP/IP Suite• Differentiate between the three types of Internet addresses

Objectives



2.1 The OSI Model

Established in 1947, the Established in 1947, the International Standards Organization (ISO)International Standards Organization (ISO) is a is a multinational body dedicated to worldwide agreement on international multinational body dedicated to worldwide agreement on international standards. An ISO standard that covers all aspects of network standards. An ISO standard that covers all aspects of network communications is the communications is the Open Systems Interconnection (OSI)Open Systems Interconnection (OSI) model. It model. It was first introduced in the late 1970s.was first introduced in the late 1970s.

The topics discussed in this section include:The topics discussed in this section include:

Layered ArchitectureLayered ArchitecturePeer-to-Peer ProcessesPeer-to-Peer ProcessesEncapsulationEncapsulation



ISO is the organization.OSI is the model

Note:Note:



Figure 2.1 The OSI model



Figure 2.2 OSI layers



Figure 2.3 An exchange using the OSI model



2.2 Layers in the OSI Model

The functions of each layer in the OSI model is briefly described.The functions of each layer in the OSI model is briefly described.

The topics discussed in this section include:The topics discussed in this section include:

Physical LayerPhysical LayerData Link LayerData Link LayerNetwork LayerNetwork LayerTransport LayerTransport LayerSession LayerSession LayerPresentation LayerPresentation LayerApplication LayerApplication LayerSummary of LayersSummary of Layers



Figure 2.4 Physical layer



The physical layer is responsiblefor the movement of individual bits from one hop (node) to the next.

Note:Note:



Figure 2.5 Data link layer

Continua…

Chapter 2

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