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OSI Model Layers and Purposes

Identify the purpose and use-case of each OSI Model Layer.


Deals with the physical transmission of data over network media.
Translates data between the application and network formats, ensuring proper encoding and encryption.
Ensures reliable data transfer and error correction between hosts.
Manages and controls communication sessions between computers.
Provides services directly to end-users and applications, like email or file transfer.
Controls data framing, error detection, and medium access control.
Handles logical addressing, routing, and data packet forwarding.
Layer 1
Layer 7
Layer 5
Layer 2
Layer 3
Layer 4
Layer 6