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CWNP Certification
CWAP-405 Exam
CWNP.CWAP-405.v2026-06-05.q89 Dumps

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Question 31

You have implemented centralized, infrastructure-based spectrum analysis. The Aps are configured to perform spectrum analysis in an ad-hoc manner and will go offline as Aps to perform this duty when needed.
What unique method of spectrum analysis monitoring is provided by this solution that is not typically available in a laptop-based analyzer?

A.Real-time FFT
B.Band selection
C.Web-based viewing
D.RBW adjustments

Correct Answer: D

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Question 32

How is the length of an AIFS calculated?

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

Correct Answer: A

The Arbitration Interframe Space (AIFS) is calculated as the Short Interframe Space plus a number of slot times determined by the AIFSN value. The formula is SIFS plus AIFSN multiplied by the slot time, which defines the waiting period before a station may begin contention for the medium under EDCA.

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Question 33

You are considering the performance of a BSS based on different PHY types used. In the BSS, one device must use ERP as it does not support HT in its 2.4 GHz band.
What is the duration of the interframe space for this ERP device for standard data frame transmissions?

A.16 microseconds
B.10 microseconds
C.9 microseconds
D.28 microseconds

Correct Answer: A

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Question 34

Prior to a retransmission what happens to the CWmax value?

A.Increases by 1
B.Reset to 0
C.Set to the value of the AIFSN
D.Doubles and increases by 1

Correct Answer: D

Before a retransmission, the CWmax (Contention Window maximum) value doubles and increases by 1. The CWmax is a parameter that determines the upper limit of the random backoff time that a STA (station) has to wait before attempting to access the medium. The random backoff time is chosen from a range of values between CWmin (Contention Window minimum) and CWmax. The CWmin and CWmax values depend on the AC (Access Category) of the traffic and the PHY type of the STA. If a transmission fails due to a collision or an error, the STA has to retransmit the frame after waiting for another random backoff time. However, to reduce the probability of another collision, the STA increases its CWmax value by doubling it and adding 1.
This increases the range of possible backoff values and spreads out the STAs more evenly. The STA resets its CWmax value to its original value after a successful transmission or after reaching a predefined limit. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page
196-197

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Question 35

A PHY Header is added to the PSDU at which layer?

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

Correct Answer: C

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-405], Chapter 4: 802.11 Physical Layer, page 97-98

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