The OSI Model's Seven Layers Defined and Functions Explained





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:




  • Application
  • Presentation
  • Session
  • Transport
  • Network
  • Data Link
  • Physical

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