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CWNP Certified Wireless Analysis Professional Sample Questions (Q142-Q147):

NEW QUESTION # 142
Several users have reported WLAN network connection issues and the users connect to the same AP. These users are spread throughout a 320 square meter area. Using a spectrum analyzer, you see RF energy across the entire 2.4 GHz band at significant signal strength levels.
The users all connect using either HT or ERP devices.
What is the likely cause of this problem within this area?

A. Wide-band jammer
B. Bluetooth devices
C. Video camera
D. Microwave oven

Answer: A

NEW QUESTION # 143
A manufacturing facility has installed a new automation system which incorporates an 802.11 wireless network. The automation system is controlled from tablet computers connected via the WLAN. However, the automation system has not gone live due to problem with the tablets connecting to the WLAN. The WLAN vendor has been onsite to perform a survey and confirmed good primary and secondary coverage across the facility. As a CWAP you are called in to perform Spectrum Analysis to identify any interference sources. From the spectrum analysis, you did not identify any interference sources but were able to correctly identify the issue. Which of the following issues did you identify from the spectrum analysis?

A. There is a power mismatch between the APs and the clients
B. The tablets are entering power save mode and failing to wake up to receive the access points transmissions
C. The tablets are connecting to the wrong SSID
D. A high noise floor has resulted in a SNR of less than 20%

Answer: A

Explanation:
The most likely issue that can be identified from the spectrum analysis is a power mismatch between the APs and the clients. A power mismatch occurs when the APs transmit at a higher power level than the clients, or vice versa. This can cause asymmetric communication, where one side can hear the other, but not vice versa. This can result in poor performance, disconnections, or packet loss. A spectrum analysis can reveal a power mismatch by showing different signal amplitudes or RSSI values for the APs and the clients on the same channel or frequency. The other options are not correct, as they cannot be identified from the spectrum analysis alone. The tablets' SSID, power save mode, and noise floor can be determined by using other tools or methods, such as protocol analysis, site survey, or device configuration.

NEW QUESTION # 144
Given: Before installing a Wi-Fi network, ABC Company performed a spectrum analysis looking for problems. The 2.4 GHz RF spectrum looked like Image-A. After installing an ERP WLAN, ABC Company performed another spectrum analysis during business hours. The 2.4 GHz RF spectrum then looked like Image-B close to an AP on channel 1.

Now the 2.4 GHz RF spectrum looks like Image-C and access points and clients can no longer communicate on channel 1. What is happening on channel 1?

A. A high-power, narrowband RF interference source on channel 1 is causing the CCA energydetects(ED) function on 802.11 devices to indicate a busy medium because the signal source is above the ED threshold.
B. Detection of a DFS radar event has discontinued 802.11 operation on channel 1, but the access point's Channel Switch Announcement frame cannot be sent due to the presence of radar.
C. Stronger transmissions from licensed 2.4 GHz users, such as HAM operators, are compressing the transmissions from the channel 1 access points into the lower portion of the band.
D. The shape of the signals in images B and C indicates that a licensed user in this frequency range has enabled the "guard bands" in an effort to restrict local interference with other systems.
E. The access point's antenna connectors have been tampered with, causing "spike and shear" RF transmissions that are not compatible with the OFDM PHY format. For that reason, client devices cannot receive the AP's transmissions without error.

Answer: A

NEW QUESTION # 145
Which parameters accurately describe the Beacon Interval field in the Beacon frame? (Choose 2)

A. Value can range from 0 to 2007
B. 4-octet length
C. Indicates the exact time interval between Beacon transmissions
D. Indicates the desired time interval between TBTTs
E. easured in time units of 1024 µs

Answer: D,E

NEW QUESTION # 146
You have been asked to recommend a protocol analysis solution that uses open source software and works with the Linux platform. It must provide decoding of 802.11ac frames and minimal support for reporting and statistics.
What solution would you recommend?

A. Wi-Fi Analyzer Pro
B. Wireshark
C. CommView for Wi-Fi
D. OmniPeek

Answer: B

NEW QUESTION # 147
......

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