Where does 802.11 fit in the OSI Model?

802.11 is a set of data link and physical layer protocols.

Data Link Layer (MAC):

Responsible for reliable link-to-link data transfer.

  • Channel access (CSMA/CA)
  • Addressing
  • Frame validation (management, data, control frames)
  • Error detection
  • Security mechanisms

Physical (PHY) Layer:

Responsible for putting bits "on the air".

OSI.png
Click image to enlarge.
​

For 802.11-based applications, the following functionality is not defined by 802.11 and must be implemented by the Application Layer (i.e., your code):

  • Choosing a Radio Frequency (RF) channel to start/join a network
  • Choosing which network to join
  • When to start/join a network
  • When to (re-)associate with a network

  Return to Top

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.