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CWNP CWAP-404 Exam Certification Details:

Recommended Training	CWAP self-paced training kit, Training Class
Exam Registration	PEARSON VUE
Number of Questions	60
Duration	90 minutes

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CWNP Certified Wireless Analysis Professional Sample Questions (Q185-Q190):

NEW QUESTION # 185
In the 2.4 GHz band, what data rate are Probe Requests usually sent at from an unassociated STA?

A. The minimum basic rate
B. MCS 0
C. 6 Mbps
D. 1 Mbps

Answer: A

Explanation:
In the 2.4 GHz band, probe requests are usually sent at the minimum basic rate from an unassociated STA. A probe request is a type of management frame that is transmitted by a STA to discover available BSSs in its vicinity. A probe request can be sent on one or more channels in either passive or active scanning mode. In passive scanning mode, a STA listens for beacon frames from APs on each channel. In active scanning mode, a STA sends probe requests on each channel and waits for probe responses from APs. A probe request is usually sent at the minimum basic rate, which is the lowest data rate among the supported rates that is required for all STAs to join and communicate with a BSS. The minimum basic rate can vary depending on the configuration of each BSS, but it is typically one of these values: 1 Mbps, 2 Mbps, 5.5 Mbps, or 11 Mbps in the 2.4 GHz band. The other options are not correct, as they do not reflect how probe requests are usually sent in the 2.4 GHz band. MCS 0 is a modulation and coding scheme used by 802.11n/ac devices in either band, but it is not a data rate per se. 6 Mbps is a data rate used by OFDM devices in either band, but it is not usually configured as a minimum basic rate in the 2.4 GHz band.

NEW QUESTION # 186
What is used to respond with an uplink transmission to an MU-RTS trigger frame in the 802.11ax PHY?

A. HE MU PPDU
B. HE SU PPDU
C. VHT PPDU
D. HE TB PPDU

Answer: D

Explanation:
An HE TB PPDU (High Efficiency Trigger-Based Packet Data Unit) is used to respond with an uplink transmission to an MU-RTS trigger frame in the 802.11ax PHY (Physical Layer). An MU- RTS trigger frame is a frame that initiates a multi-user transmission opportunity (MU-TXOP) by requesting multiple stations (STAs) to send clear-to-send (CTS) frames on different spatial streams or resource units (RUs). An HE TB PPDU is a frame that contains data from multiple STAs that have been allocated RUs by an MU-RTS trigger frame or another type of trigger frame.
An HE SU PPDU (High Efficiency Single User Packet Data Unit) is a frame that contains data from a single STA using all available spatial streams or RUs. An HE MU PPDU (High Efficiency Multi User Packet Data Unit) is a frame that contains data from multiple STAs using different spatial streams or RUs without being triggered by another frame. A VHT PPDU (Very High Throughput Packet Data Unit) is a frame that uses the 802.11ac PHY and does not support multi- user transmissions.

NEW QUESTION # 187
When performing protocol analysis, you notice a high number of RTS/CTS frames being transmitted on an HT network. You suspect this may be due to HT protection mechanisms. Where in the Beacon frame would you look to determine which one of the four HT protection modes the AP is operating in?

A. Non-HT Present Element
B. HT Protection Element
C. HT Information Element
D. HT Operation Element

Answer: C

Explanation:
Explanation
When performing protocol analysis, you would look at the HT Information Element in the Beacon frame to determine which one of the four HT protection modes the AP is operating in. The HT Information Element contains various subfields that provide information about the HT network configuration and operation. One of these subfields is the HT Protection field, which indicates whether any protection mechanisms are required for mixed-mode operation with non-HT STAs. The four possible values for this field are:
No Protection: No protection mechanisms are required.
Non-member Protection: RTS/CTS or CTS-to-self protection is required for all HT transmissions.
20 MHz Protection: RTS/CTS or CTS-to-self protection is required for all HT transmissions using a 40 MHz channel.
Non-HT Mixed Mode: All HT transmissions must use a non-HT preamble and header . References:
CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11:
802.11n/ac/ax PHYsical Layer Frame Exchanges, page 378; CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11: 802.11n/ac/ax PHYsical Layer Frame Exchanges, page 379.

NEW QUESTION # 188
Which piece of information Is not transmitted in an HT PDDU header?

A. Channel number
B. Number of Spatial Streams
C. PPDU length
D. MCS index

Answer: A

Explanation:
The channel number is not transmitted in an HT PPDU header. An HT PPDU header is a part of the PPDU that contains information such as modulation, coding, data rate, and number of spatial streams for an 802.11n transmission. The channel number is not included in the HT PPDU header, as it is determined by the frequency band and channel width that are used by the transmitter and receiver. The channel number can be inferred from the frequency band and channel width, which are indicated by bits in different fields of the HT PPDU header, such as HT- SIG and HT-LTF. The other options are not correct, as they are transmitted in an HT PPDU header. The number of spatial streams, PPDU length, and MCS index are indicated by bits in the HT-SIG field of the HT PPDU header.

NEW QUESTION # 189
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?

A. Talk to the end users about their experiences
B. Obtain detailed -knowledge of the wireless vendors debug and logging options
C. Observe the problem
D. Interview the network manager about the issues being experienced

Answer: C

Explanation:
Explanation
Observing the problem is the most important step in the WLAN troubleshooting methodology among those listed. This step involves capturing and analyzing the relevant data from the wireless network, such as packets, frames, spectrum, and performance metrics. Observing the problem helps to verify the existence and scope of the issue, identify the root cause and possible solutions, and validate the results of any actions taken. The other steps are also important, but they are not as critical as observing the problem12 References:
CWAP-404 Study Guide, Chapter 1: Troubleshooting Methodology, page 15
CWAP-404 Objectives, Section 1.2: Observe the problem

NEW QUESTION # 190
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