CWNA-106 Exam Dumps : Certified Wireless Network Administrator

802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.

Four 802.1p user priorities are mapped to eight 802.11 transmit queues.

When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.

To improve efficiency, Block Acknowledgments are required for Voice and Video WMM queues.

802.11 control frames are assigned to the 802.11 EF priority queue.

Diffraction

Reflection

Refraction

Diffusion

Scattering

Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.

The Fade Margin of a long-distance radio link should be equivalent to the receiver’s antenna gain.

A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.

The Fade Margin is a measurement of signal loss through free space, and is a function of frequency and distance.