At this layer applications communicate on a format for exchanging data. The Session layer provides character set conversion and formats the data. It performs encryption and decryption, compression and decompression.
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The OSI Presentation Layer

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.

OSI Presentation Layer

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.

Computer Networking Sections
Networking Protocols and Standards

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