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
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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