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CWNP CWAP-404 Intereactive Testing Engine, CWAP-404 Positive Feedback

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CWNP CWAP-404 Exam Syllabus Topics:

Topic
Details

Topic 1

Protocol Analysis: The topic in the CWNP CWAP-404 exam evaluates the skill of a wireless network professional to capture and analyze 802.11 frames effectively. Candidates must demonstrate proficiency in configuring protocol analysis tools, interpreting frame captures to diagnose issues, and applying appropriate troubleshooting methods.

Topic 2

MAC Sublayer and Functions: The topic measures the ability of a wireless network professional to understand and analyze the MAC layer operations. Candidates are expected to validate BSS configurations and identify issues like CRC errors and retransmissions, ensuring they can maintain the integrity and performance of the WLAN.

Topic 3

Spectrum Analysis: The topic assesses the ability of a wireless network professional to capture and interpret RF spectrum data. The exam targets the skills in identifying device signatures and RF issues through spectrum analyzers.

Topic 4

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.

CWNP CWAP-404 Exam Certification Details:

Recommended Training
CWAP self-paced training kit, Training Class

Sample Questions
CWNP CWAP-404 Sample Questions

Exam Registration
PEARSON VUE

Exam Name
Wireless Analysis Professional

Exam Code
CWAP-404 CWAP

Number of Questions
60

Duration
90 minutes

>> CWNP CWAP-404 Intereactive Testing Engine <<

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CWNP Certified Wireless Analysis Professional Sample Questions (Q136-Q141):

NEW QUESTION # 136
In the analyzer trace shown, the TBTT is nominally 102.5 milliseconds.

Why does the Beacon transmission interval vary?

A. The access point must arbitrate to gain access to the RF medium in order to transmit a Beacon.
B. Beacon frames vary in size, and therefore some take slightly longer to send than others.
C. The DCF Interframe space (DIFS) is nominally 50 ms, but typically varies by as much as 10 ms, which causes delays in Beacons.
D. This trace shows an HT network where HR/DSSS nodes are active on the network. The access point is changing slot times from short to long as needed.

Answer: A

NEW QUESTION # 137
Which statement is true regarding the Association Identifier (AID) used in IEEE 802.11 WLANs?

A. The AID has a maximum value of 2048, and is used to uniquely identify a wireless client station associated with an access point.
B. The AID is used by the access point in EDCA mode to reduce duplicate transmissions when sending multicasts.
C. The AID field is present only in Beacons frames.
D. The AID has a maximum value of 2007, and resides in the duration/ID field of a PS-Poll frame.
E. The client station is assigned an AID value in the 802.11 authentication response frame.

Answer: D

NEW QUESTION # 138
When performing protocol analysis, you capture an 802.1 lac data frame on channel 52, transmitted at MCS 8.
At what data rate was the PHY Preamble transmitted?

A. 78 Mbps
B. 54 Mbps
C. 6 Mbps
D. 86.7 Mbps

Answer: C

Explanation:
Explanation
The data rate at which the PHY preamble was transmitted is 6 Mbps. The PHY preamble is a part of the PPDU that is transmitted before the PHY header and the PSDU. The PHY preamble consists of a series of training fields that help the receiver to detect and synchronize with the signal. The PHY preamble is always transmitted at a fixed data rate that depends on the type of PPDU (e.g., OFDM, HT, VHT, HE). For an 802.1 lac data frame on channel 52, which uses VHT PPDUs, the data rate for the PHY preamble is 6 Mbps. This data rate does not depend on MCS (Modulation and Coding Scheme), which only affects the data rate for the PSDU. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 4: 802.11 Physical Layer, page 99-100

NEW QUESTION # 139
How is the length of an AIFS is calculated?

A. SIFS + AIFS * Time Unit
B. DIFS + SIFS + AIFSN
C. SIFS * Slot Time + AIFSN
D. AIFSN * Slot Time + SIFS

Answer: D

Explanation:
The length of an AIFS (Arbitration Interframe Space) is calculated by multiplying the AIFSN (Arbitration Interframe Space Number) by the Slot Time and adding the SIFS (Short Interframe Space). An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. Each AC has a different AIFSN value, which determines how long it has to wait before attempting to access the medium. A lower AIFSN value means a higher priority and a shorter waiting time. The Slot Time is a fixed value that depends on the PHY type and channel width. The SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs or CTSs. The formula for calculating the AIFS length is: AIFS = AIFSN * Slot Time + SIFS.

NEW QUESTION # 140
What should the To DS and From DS flags be to set to in an Association Response frame?

A. To DS = 1, From DS = 1
B. To DS - 1, From DS = 0
C. To DS = 0, From DS = 1
D. To DS - 0, From DS = 0

Answer: D

Explanation:
Explanation
The To DS and From DS flags should be set to 0 in an Association Response frame. An Association Response frame is a type of management frame that is transmitted by an AP to accept or reject an association request from a STA. The To DS (To Distribution System) and From DS (From Distribution System) flags are two bits in the Frame Control field of the MAC header that indicate whether a frame is destined for or originated from the DS (Distribution System), which is a system that connects multiple BSSs together. The To DS and From DS flags can have four possible combinations: 00, 01, 10, or 11. For an Association Response frame, which is sent from an AP to a STA within a BSS, both flags should be set to 0. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 5: 802.11 MAC Sublayer, page 121-122

NEW QUESTION # 141
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