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CWNP Certified Wireless Analysis Professional Sample Questions (Q15-Q20):

NEW QUESTION # 15
ABC International has installed a new smart ZigBee controlled lighting system. However, the network team is concerned that this new system will interface with the existing WLAN and has asked you to investigate the impact of the two systems operating simultaneously in the 2.4 GHz band. When performing Spectrum Analysis, which question could you answer by looking at the FFT plot?

A. Do the ZigBee channels used by the lightning system overlap with the WLAN channels?
B. Is the ZigBee system causing an increase in WLAN retries?
C. Is the WLAN corrupting ZigBee system messages?
D. Is the ZigBee system using more the 50% of the available airtime?

Answer: A

Explanation:
The FFT plot is a spectrum analysis plot that shows the RF power present at a particular frequency over a short period of time. It can help identify the sources and characteristics of RF signals in the spectrum. By looking at the FFT plot, you can determine which ZigBee channels are used by the lighting system and whether they overlap with the WLAN channels in the 2.4 GHz band. ZigBee channels are 5 MHz wide and WLAN channels are 20 MHz or 40 MHz wide, so there is a possibility of overlap and interference between them. The other questions cannot be answered by looking at the FFT plot alone, as they require other types of plots or analysis tools, such as duty cycle plot, airtime utilization plot, or protocol analyzer.

NEW QUESTION # 16
A PHY Header is added to the PSDU at which layer?

A. PHY
B. LLC
C. MAC
D. Network

Answer: A

Explanation:
Explanation
A PHY header is added to the PSDU at the PHY layer. A PHY header is a part of the PPDU that contains information such as modulation, coding, and data rate. The PHY header is added by the PHY layer when it converts a PSDU to a PPDU for transmission, or removed by the PHY layer when it converts a PPDU to a PSDU for reception. The other layers do not add or remove a PHY header. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 4: 802.11 Physical Layer, page 97-98

NEW QUESTION # 17
You have installed a new 802.11ac WLAN configured with 80 MHz channels. Users in one area are complaining about poor performance. This area is currently served by a single AP. You take a spectrum analysis capture in the poor performing area. While examining the waterfall plot you notice the airtime utilization is higher on the first 20 MHz of the 80 MHz channel when compared to the rest of the channel. What do you conclude?

A. The AP is misconfigured and needs to be reconfigured to 80MHz operation
B. Non Wi-Fi interference is preventing the APs 80 MHz operation
C. RRM is enabled and has dynamically picked a 20 MHz channel
D. The first 20 MHz is the AP's primary channel and higher airtime utilization on the primary channel is normal when an AP Is configured for 80 MHz operation

Answer: B

Explanation:
The most likely cause of higher airtime utilization on the first 20 MHz of the 80 MHz channel is non- Wi-Fi interference. Non-Wi-Fi interference can prevent an AP from using its full channel width, as it will degrade the signal quality and increase the noise floor on some parts of the channel. This will force the AP to fall back to a narrower channel width, such as 20 MHz or 40 MHz, to maintain communication with its clients. The waterfall plot can help identify non-Wi-Fi interference by showing spikes or bursts of RF energy on specific frequencies or sub-channels.
The other options are not correct, as they do not explain why only the first 20 MHz of the channel has higher airtime utilization.

NEW QUESTION # 18
As it pertains to HT L-SIG TXOP Protection, what statement is true?

A. L-SIG TXOP Protection is specified for the purpose of protecting OFDM (802.11a/g) and HT- OFDM (802.11n) transmissions from HR/DSSS stations.
B. Support for L-SIG TXOP Protection is indicated in the HT Capabilities Info field of (re)association request frames sent by ERP, OFDM, and HT-OFDM stations.
C. Support for L-SIG TXOP Protection is indicated by HT stations in the L-SIG field of the PLCP header of HT-mixed format frames.
D. An L-SIG TXOP protected frame exchange sequence always begins with an RTS/CTS or a CTS- to-Self.

Answer: D

NEW QUESTION # 19
Where would you look in a packet trace file to identify the configured Minimum Basic Rate (MBR) of a BSS?

A. In the MBR Action frame
B. In the MBR Information Element in an Association Response frame
C. Supported Rates & Extended Supported Rates elements in a Beacon frame
D. In the Minimum Basic Rate Element in a Beacon frame

Answer: C

Explanation:
Explanation
The configured Minimum Basic Rate (MBR) of a BSS can be identified by looking at the Supported Rates and Extended Supported Rates elements in a Beacon frame. A Beacon frame is a type of management frame that is transmitted by an AP to advertise its presence and capabilities to potential clients. A Beacon frame contains various information elements (IEs) that provide details about the BSS configuration and operation. The Supported Rates andExtended Supported Rates IEs list the data rates that are supported by the AP for data transmission. The MBR is the lowest data rate among these supported rates that is required for all clients to join and communicate with the BSS. The MBR is usually marked with a flag bit in these IEs to indicate its mandatory status. The other options are not correct, as they do not exist or do not indicate the MBR of a BSS. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 5: 802.11 MAC Sublayer, page 123-124

NEW QUESTION # 20
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