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Table Of Contents  CertiGuide to Network+
 9  Chapter 0010:  ISO, OSI, and IEEE Standards

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I  Concepts & Terms Required - Chapter 0010
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Applying the OSI Model to Network Communication
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II  Open Systems Interconnect

The OSI model determines which parts do what in a LAN, and how they interconnect to accomplish the mission of network communications. This model is designed in layers. Beginning at the bottom layer, it includes hardware, software, topologies, and other control functions:

Figure 24: OSI Model, showing flow of information from sending PC (left) to receiving PC (right)

 


The OSI model is a 7-layer model, which loosely details how things work. Each layer builds on the previous one, adding functionality to the capabilities included in the lower layers. Understanding of the OSI model is required for successful NETWORK+ test. Certification.

We shall cover each layer one by one, from lowest to highest.

OSI = Success

The NETWORK+ test uses the OSI 7-layer model, not the older DOD (Department of Defense) model for TCP/IP when looking at the details of TCP/IP. Understanding of the OSI model, particularly where components function in the model, is an important part of the
NETWORK+ theory portion of the test.


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I  Concepts & Terms Required - Chapter 0010
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Applying the OSI Model to Network Communication
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