Where does 802.11 fit in the IP Network 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”

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

This module covers commissioning of Wi-Fi® devices, which covers techniques for implementing some of these functions.

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