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

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Layer 5 - Session Layer
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Layer 7 - Application Layer
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Layer 6 - Presentation Layer

The presentation layer is generally considered to be the province of the operating system.

Its purpose is to prepare data for the application layer and format data. Sometimes data compression or encryption occurs here. Encryption is the process of encoding data, usually using some sort of key word or phrase; so that when the data is viewed by an unauthorized individual it is unintelligible. You might want to encrypt data if you are running over a public network, using a VPN. Data compression is the process of encoding data in a (usually non-secret) way that allows it to be stored in less space than it would normally take up. You might want to use data compression to send data from one host to another, across a slow network link, to minimize transmission time.

Figure 30: Layer 6 - Presentation Layer

 


Layer 6

Be aware that layer 6 is the presentation layer.



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Layer 5 - Session Layer
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Layer 7 - Application Layer
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