THE PRESENTATION LAYER - LAYER 6



The main function of the presentation layer is to define the data formats used to provide a number of services to the Application layer.

Included in these services the ones you need to know are:

  • Data encryption - coding data so that it is protected from unauthorizaed access
  • Data compression - reducing the number of packets required for transport
  • Data formatting
  • Data conversion
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    Conversions standards defined on the Presentation Layer for data conversion and formatting:
    Category Standards
    Data Conversion ASCII, EBCDIC, encryption
    Audio/video conversion MIDI, MPEG, QuickTime, AVI
    Graphics conversion GIF, JPEG, PICT, TIFF








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