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Osi Layer in Malaysia

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Expert Reference Series of White Papers

The OSI Model: Understanding the Seven Layers of Computer Networks
1-800-COURSES www.globalknowledge.com

The OSI Model: Understanding the Seven Layers of Computer Networks
Paul Simoneau, Global Knowledge Course Director, Network+, CCNA, CTP

Introduction
The Open Systems Interconnection (OSI) model is a reference tool for understanding data communications between any two networked systems. It divides the communications processes into seven layers. Each layer both performs specific functions to support the layers above it and offers services to the layers below it. The three lowest layers focus on passing traffic through the network to an end system. The top four layers come into play in the end system to complete the process. This white paper will provide you with an understanding of each of the seven layers, including their functions and their relationships to each other. This will provide you with an overview of the network process, which can then act as a framework for understanding the details of computer networking. Since the discussion of networking often includes talk of “extra layers”, this paper will address these unofficial layers as well. Finally, this paper will draw comparisons between the theoretical OSI model and the functional TCP/IP model. Although TCP/IP has been used for network communications before the adoption of the OSI model, it supports the same functions and features in a differently layered arrangement.

An Overview of the OSI Model

Copyright ©2006 Global Knowledge Training LLC. All rights reserved.

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A networking model offers a generic means to separate computer networking functions into multiple layers. Each of these layers relies on the layers below it to provide supporting capabilities and performs support to the layers above it. Such a model of layered functionality

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