Legit CWNA-106 Exam Download

Certified Wireless Network Administrator Questions and Answers

Question 13

In addition to throughput enhancements, what other improvements does a dual-band 802.11ac AP provide when compared with 802.11a/g APs? (Choose 2)

Introduces “fast transition” roaming protocols for VoWiFi phones

Better link reliability between 802.11a/b/g client devices and 802.11ac APs

Improves service quality for real-time applications at greater distances

Increases in receive sensitivity enhance RTLS location accuracy

Stronger security with more robust encryption modes.

Question 14

What statement about the IEEE 802.11e QoS facility is true?

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.

Question 15

What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE 802.11 WLANs?

802.11a and 11n use six (6) “pilot” subcarriers as a reference for the receiver to detect frequency and phase shifts of the signal.

802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data rates from 1-600 Mbps.

With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon coding rates.

802.11ac VHT-OFDM utilizes 256-QAM, which increases the data rate significantly over 64-QAM available in HT-OFDM.

In 802.11a OFDM, fifty-six (56) subcarriers are used as parallel symbol transmission paths to carry data.

Question 16

The IEEE 802.11a/n/ac physical layer technologies utilize the 5 GHz frequency band. What is true of the channels in this frequency spectrum?

14 channels are available worldwide.

11 channels are available worldwide.

Regulatory domains worldwide require DFS and TPC in all these channels.

DFS may be required in some regulatory domains on some channels.

802.11 channels are separated by 5 Mhz