Certified Wireless Design Professional (CWDP): PW0-250

In a manufacturing facility with highly reflective materials, you are planning an upgrade to your existing 802.11b solution. You have chosen a dual-band 802.11n infrastructure product for this purpose. Your client applications include:

Handheld scanners -- for inventory management

Toughbooks (laptops) -- mounted on forklifts for inventory and workflow management

VoWiFi phones -- used by select employees throughout the facility

You are evaluating all of the 802.11n enhancements and determining which features to enable for your environment and applications.

In this scenario, what 802.11n enhancements should NOT be enabled on the 2.4 GHz radio of the new APs? (Choose 2)

A. 40 MHz channels

B. Short guard intervals

C. Block Acknowledgments

D. Frame aggregation

E. MRC

F. STBC

What is a radome?

A. A type of semi-circular ceiling found in atriums and that is a heavy cause of RF reflection.

B. A weatherproof piece of plastic covering an antenna or antenna system.

C. The unit used to measure the signal reflected backward by the end of a cable.

D. A piece of metal positioned behind APs mounted on outdoor poles, designed to limit the butterfly effect.

E. The unwanted signal coverage provided by either side or back lobes in directional antennas.

Why does a frame transmitted at 1 Mbps have a greater usable range than the same frame transmitted at 54 Mbps?

A. Free space path loss causes greater signal dispersion for higher rate transmissions.

B. Receiver sensitivity requirements are lower for frames transmitted with less complex modulation and coding.

C. To improve reliability, 802.11 STAs increase transmit power as the signaling rate decreases.

D. Lower data rate RF transmissions travel at higher speeds and are less likely to experience collisions.

E. Frames sent at higher data rates are also sent at higher power levels and are therefore more prone to collisions and multipath.