Chapter 2 The OSI Model Prepared by: Mrs. Wilma M. de Pano.

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Presentation transcript:

Chapter 2 The OSI Model Prepared by: Mrs. Wilma M. de Pano

Objectives Upon completion of this chapter, you will be able to familiarize yourself with the: General Model of Communication The OSI Reference Model Comparison of the OSI Model and the TCP/IP Model

Analyzing Network in Layer

Comparing Network

Source, destination and data packets Data or Data Packet – information that flows on a Network

Media 10 Base2 50 ohm Coaxial Cable Fiber Optic

Media 10 Base5 Thicknet cable UTP

Protocols – is a set of rules that make communication on a network more efficient.

ISO International Organization for Standardization They created a network model that would help vendors create networks that would be compatible with, and operate with, other networks.

OSI reference model Provided the vendors with a set of standards that ensured greater compatibility and interoperability between the various types of network technologies that were produced by the many companies around the world.

Why a layered Network Model? Reduced complexity Standardize interfaces Facilitate modular engineering Ensure interoperable technology Accelerate evolution Simplifies teaching and learning

The 7 Layers of OSI Model

Data Encapsulation

Example

Peer-to-Peer Communication

TCP/IP Transmission Control Protocol / Internet Protocol

Protocol Graph

Comparing TCP/IP with OSI Model

Similarities and Differences of TCP/IP and OSI Models Similarities – Both have layers – Both have application layers, though they include very different services – Both have comparable transport and network layers – Packet-switched technology is assumed – Networking professionals need to know both Differences – TCP/IP combines the presentation and session layer issues into its application layer – TCP/IP combines the OSI data link and physical layers into one layer – TCP/IP appears simpler because it has fewer layers – TCP/IP protocols are the standards around which the internet developed, so that TCP/IP models gains credibility just bec. of its protocols

End of Presentation Thank you