Chapter 8

802.11 Medium Access

In this chapter, you will learn about the following:

CSMA/CA vs. CSMA/CD

Collision detection

Distributed Coordination Function (DCF)

Interframe space (IFS)

Duration/ID field

Carrier sense

Random back-off timer

Point Coordination Function (PCF)

Hybrid Coordination Function (HCF)

Enhanced Distributed Channel Access (EDCA)

HCF Controlled Channel Access (HCCA)

Block acknowledgment (BA)

Wi-Fi Multimedia (WMM)

Airtime Fairness

One of the difficulties we had in writing this chapter was that in order for you to understand how a wireless station gains access to the media, we have to teach more than what is needed for the CWNA exam. The details are needed to grasp the concepts; however, it is the concepts that you will be ...

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