CWNP CWAP-405 Questions - Tips To Pass Exam 2026

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CWNP CWAP-405 Exam Syllabus Topics:

Section	Weight	Objectives
PHY Layers and Technologies	10%	- 802.11 physical layer standards - PHY layer troubleshooting - Channelization and frequency usage - Modulation and coding schemes
WLAN Medium Access	10%	- CSMA/CA and medium access rules - Medium access related issues - Contention and coordination functions - Medium access performance analysis
MAC Sublayer and Functions	25%	- MAC frame formats and types - MAC layer troubleshooting - QoS and power management - MAC addressing and operations
Protocol Analysis	15%	- Troubleshooting using protocol data - Capture and decode process - Protocol analysis fundamentals - Analysis tools and methods
Spectrum Analysis	10%	- Spectrum analysis tools - Troubleshooting RF issues - Interference detection and classification - RF spectrum fundamentals
802.11 Frame Exchanges	30%	- Association and authentication processes - Frame exchange troubleshooting - Data transfer and protection mechanisms - Frame exchange sequences

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CWNP Certified Wireless Analysis Professional Sample Questions (Q110-Q115):

NEW QUESTION # 110
You are troubleshooting an 802.1X\EAP exchange and see the AP sends an initial EAP Request for Identity, the client responds with an EAP response frame containing an identity. Though the AP acknowledges receipt of the EAP response no more EAP messages are transmitted. What should be the next steps in the 802.1X\EAP Authentication?

A. The AP should forward the EAP Response to the RADIUS sever and will in turn forward RADIUS server responses in an EAP Request packet to the supplicant
B. The AP should request an EAPoL-Start message from the supplicant
C. The AP should verify that the identity is valid with the RADIUS server and then either transmit an EAP-Success or EAP-Warning message.
D. The AP should send an EAP request to the supplicant for the user's password or certificate.

Answer: A

Explanation:
In 802.1X, after receiving the EAP Response/Identity from the client, the AP (authenticator) forwards it to the RADIUS (authentication) server. The RADIUS server then continues the EAP authentication by sending EAP Request messages back to the supplicant via the AP, completing the authentication process.

NEW QUESTION # 111
What interframe space would be expected between a CIS and a Data frame?

A. AIFS
B. DIFS
C. SIFS
D. PIFS

Answer: C

Explanation:
The interframe space that would be expected between a CTS (Clear to Send) and a Data frame is SIFS (Short Interframe Space). A SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs (Acknowledgements), CTSs, or data frames that are part of a fragmentation or aggregation process. A SIFS is a fixed value that depends on the PHY type and channel width. A CTS and a Data frame are part of a virtual carrier sense mechanism called RTS/CTS (Request to Send/Clear to Send), which is used 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 after waiting for a SIFS, followed by an ACK frame from the receiver after another SIFS. The other options are not correct, as they are not used between a CTS and a Data frame. A PIFS (PCF Interframe Space) is used for medium access by the PCF (Point Coordination Function), which is an optional and rarely implemented polling-based mechanism that provides contention-free service for time-sensitive traffic. An AIFS (Arbitration Interframe Space) is used for medium access by different ACs (Access Categories), which are logical queues that correspond to different QoS (Quality of Service) levels for different types of traffic. An AIFS is a variable interframe space that depends on the AIFSN (Arbitration Interframe Space Number) value of each AC. A DIFS (Distributed Interframe Space) is used for medium access by the DCF (Distributed Coordination Function), which is the default and mandatory contention-based mechanism that provides best- effort service for normal traffic. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 166-167; Chapter 7: QoS Analysis, page 194-195

NEW QUESTION # 112
What is the function of the PHY layer?

A. Convert PPDUs to PSDUs for transmissions and PSDUs to PPDUs for receptions
B. Convert PSDUs to PPDUs for transmissions and PPDUs to PSDUs for receptions
C. Convert PPDUs to MSDUs for transmissions and MSDUs to PPDUs for receptions
D. Convert MSDUs to PPDUs for transmissions and PPDUs to MSDUs for receptions

Answer: B

Explanation:
The function of the PHY layer is to convert PSDUs to PPDUs for transmissions and PPDUs to PSDUs for receptions. A PSDU (PHY Service Data Unit) is the data unit that is passed from the MAC layer to the PHY layer for transmission, or from the PHY layer to the MAC layer for reception. A PPDU (PHY Protocol Data Unit) is the data unit that is transmitted or received over the wireless medium by the PHY layer. A PPDU consists of a PSDU and a PHY header, which contains information such as modulation, coding, and data rate.
The PHY layer adds or removes the PHY header to or from the PSDU during the conversion process. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 4: 802.11 Physical Layer, page 97-98

NEW QUESTION # 113
According to the 802.11n-2009 amendment, what security requirement is specified for HT BSSs?

A. HT BSSs must mandatorily support 802.11r FT.
B. All unicast traffic transmitted by an HT station and destined to an HT station must use AES- CCMP.
C. In an RSN, HT stations may not communicate with one another using TKIP.
D. TKIP cannot be supported in an HT BSS.
E. HT BSSs are prevented from supporting WEP.

Answer: C

NEW QUESTION # 114
What element was added to the general frame of 802.11 with the 802.11e amendment and the 802.11-2007 rollup?

A. QoS Control
B. RSN-IE
C. Address 4
D. HT Control

Answer: A

NEW QUESTION # 115
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