The OSI Presentation Layer

By Stephen Bucaro

At the presentaion layer, layer six of the OSI model,source and destination applications communicate on a format for exchanging data. The sending computer may convert text to a generic format ( ASCII) for transmission over a network. The receiveing computer converts the ASCII to the format required by the destination application.

Data Transformation Services Provided by the Presentation Layer

• Text format conversions
• Binary and graphics format conversions
• Compression and expansion
• Encryption and decryption

When you think of the Application layer, keep in mind that the OSI is only a model. Actual network operating systems may handle the data conversion functions at the application and session layers.

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• The OSI Data Link Layer
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• Routing Information Protocol (RIP), Open Shortest Path First (OSPF), and Routing Convergence

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