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CWNP CWAP-404 Exam Syllabus Topics:

Topic
Details

Topic 1

PHY Layers and Technologies: In the topic, the CWAP-404 exam tests the understanding of a wireless network professional about the Physical (PHY) layer functions and technologies. Wireless analysts need to describe and apply knowledge of PHY headers, PPDUs, and other PHY-related data. This topic ensures that analysts are proficient in interpreting PHY information within protocol analyzers and can select appropriate capture devices for different PHY types.

Topic 2

WLAN Medium Access: The exam evaluates the understanding of a wireless network professional about 802.11 contention algorithms and their impact on WLAN performance. The CWAP-404 Exam requires candidates to analyze QoS configurations and operations.

Topic 3

Frame Exchanges: The topic evaluates the skills of a wireless network professional in capturing, understanding, and analyzing various frame exchanges, including BSS discovery, joining, roaming, and data frames. The CWAP-404 exam targets the ability of candidates to troubleshoot and resolve issues related to MAC layer operations, ensuring they can maintain robust and efficient WLAN communications.

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CWNP Certified Wireless Analysis Professional Sample Questions (Q33-Q38):

NEW QUESTION # 33
When a client station operating under EDCA sends an RTS frame and NAV protection is desired for only the first or sole frame in the TXOP, the duration field will contain an amount of time, measured in microseconds, equal to which of the following?

A. 1 RTS, 2 ACK, 1 DATA, 4 SIFS
B. 1 RTS, 1 CTS, 2 ACK , 1 DATA, 4 SIFS
C. 1 RTS, 1 ACK, 1 DATA, 2 SIFS, 1 DIFS
D. 1 CTS, 2 ACK, 1 DATA, 2 SIFS
E. 1 CTS, 1 ACK, 1 DATA, 3 SIFS
F. The entire duration of the TXOP

Answer: E

NEW QUESTION # 34
To what data rates can a 5 GHz PHY device shift when changers occur in the signal strength?

A. 24, 18, 11, 2
B. 11, 5.5, 2, 1
C. 24, 18, 12, 6
D. 24, 18, 12, 5.5

Answer: C

NEW QUESTION # 35
An RST frame should be acknowledged by which frame?

A. RTS-Ack
B. Ack
C. CTS
D. Block Ack

Answer: C

Explanation:
An RTS (Request to Send) frame should be acknowledged by a CTS (Clear to Send) frame. An RTS and CTS frame are types of control frames that are used to implement a virtual carrier sense mechanism called RTS/CTS. RTS/CTS is a technique that helps to avoid collisions and hidden node problems in wireless transmissions. When a STA (station) wants to send a data frame, it first sends an RTS frame to the intended receiver, indicating the duration of the transmission. The receiver then responds with a CTS frame, also indicating the duration of the transmission. The other STAs in the vicinity hear either the RTS or the CTS frame and update their NAV (Network Allocation Vector) timers accordingly, deferring their access to the medium until the transmission is over. The sender then sends the data frame, followed by an ACK (Acknowledgement) frame from the receiver. The other options are not correct, as they are not used to acknowledge an RTS frame. An ACK frame is used to acknowledge a data frame, not an RTS frame. An RTS-Ack frame does not exist, as there is no such type of control frame in 802.11. A Block Ack (BA) frame is used to acknowledge multiple data frames in a single frame, not an RTS frame.

NEW QUESTION # 36
Why is a high CRC error rate in L2 protocol analysis software NOT always a valid indicator of network performance? (Choose 3)

A. If the protocol analysis radio hardware is not located in the same area as intended client devices or APs, its data sampling may not be representative of actual traffic on the network.
B. Radio and antenna hardware used for protocol analysis may not match the receive sensitivity, diversity, MIMO, or antenna gain capabilities of the network WLAN hardware.
C. Layer 2 protocol analysis can only collect and interpret data that is received properly at the MAC layer, and cannot quantify some PHY-layer problems.
D. If protocol analysis software is not properly configured with frame decryption parameters, it can't accurately calculate a CRC, which includes the encrypted frame body contents.

Answer: A,B,C

NEW QUESTION # 37
Why would a STA that supports 802.11k Radio Measurement send a Neighbor Request to an AP?

A. To learn about neighboring interference sources and tune its RF radio accordingly
B. To request a list of neighboring APs which the STA can use as roaming candidates
C. To request a list of neighboring STAs which enables the STA to better pick the right protection mechanisms
D. To inform the current AP about the STA's intent to roam to a neighboring AP, ensuring a seamless handover

Answer: B

Explanation:
Explanation
A STA that supports 802.11k Radio Measurement would send a Neighbor Request to an AP to request a list of neighboring APs which the STA can use as roaming candidates. A Neighbor Request is an Action frame that contains a subelement specifying the type of information that the STA wants to receive from the AP. A Neighbor Report is an Action frame that contains a subelement with a list of neighboring APs that match the criteria specified in the Neighbor Request. The Neighbor Report provides information such as BSSID, channel, operating class, and PHY type of each neighboring AP. This information helps the STA to perform intelligent roaming decisions based on signal quality, load, and compatibility . References: CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 12: 802.11k/v/r/u/w/ai Amendments, page 434; CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 12: 802.11k/v/r/u/w/ai Amendments, page 435.

NEW QUESTION # 38
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