Presentation Layer

The presentation layer handles the conversion of data between a Standards-based or platform independant formats to a format understood by the local machine. This allows for data to be transported between devices and still be understood.

The presentation layer performs the folowing functions:

  1. Communication with the application layer above.
  2. Translation of data conforming to cross-platform standards into formats understood by the local machine.
  3. Communication with the session layer below.

Examples of Presentation Layer Functions:

  • Conversion of .wav to .mp3
  • Conversion of a Wordperfect .wpd to a MS Word .doc
  • Conversion of .txt to .html



Home

Application
Presentation
Session
Transport
Network
Data Link
Physical
Function of Layer Protocols Network Components
  • Translates from application to network format and vice-versa
  • all different formats from all sources are made into a common uniform format that the rest of the OSI model can understand
  • responsible for protocol conversion, character conversion,data encryption / decryption, expanding graphics commands, data compression
  • sets standards for different systems to provide seamless communication from multiple protocol stacks
  • not always implemented in a network protocol
N/A Gateway

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