Open Systems Interconnect (OSI) Seven Layer Protocol

The Open Systems Interconnect (OSI) Seven Layer Protocol:


The Open Systems Interconnect (OSI) model has seven layers. This article describes and explains them, beginning with the 'lowest' in the hierarchy (the physical) and proceeding to the 'highest' (the application). The layers are stacked this way:


    The-OSI-Seven-Layer-Model
  1. Application
  2. Presentation
  3. Session
  4. Transport
  5. Network
  6. Data Link
  7. Physical

  • PRESENTATION LAYER: The presentation layer formats the data to be presented to the application layer. It can be viewed as the translator for the network. This layer may translate data from a format used by the application layer into a common format at the sending station, then translate the common format to a format known to the application layer at the receiving station. 


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