The Presentation Layer ( Layer 6 )

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The layer answers one simple question : " How should this data be presented?" In addition to properly formatting data, encryption occurs a layer.

Have you ever opened a file in a word processing application , and you the pages of unrecognizable characters? That's a Presentation Layer issue. The applications have not agreed on how the data is to be presented.


If we open a 3 page document in notepad and see 300 page of garbage, then its a presentation layer issue. As it has got no idea what to present. Like opening a adobe file in notepad or wordpad.

There are four primary tasks that the Presentation Layer is concerned with :
 - Compatibility with the operating system
 - Proper encapsulation of data for network transmission
 - Data formatting (ascii, binary )
 - Data encryption, compression, and translation

Some of the file types that are used at the Presentation layer - JPEG, ASCII, GID, MPEG, MIDI, EBCDIC and TIFF. (Basically any file in regards to how data is presented )
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