[Mar-2026] CWAP-404 Free Sample Questions to Practice One Year Update
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CWNP CWAP-404 Exam Syllabus Topics:
| Topic | Details |
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CWNP CWAP-404 Exam Certification Details:
| Exam Price | $275 USD |
| Number of Questions | 60 |
| Duration | 90 minutes |
| Passing Score | 70% |
| Exam Registration | PEARSON VUE |
| Sample Questions | CWNP CWAP-404 Sample Questions |
| Exam Name | Wireless Analysis Professional |
NEW QUESTION # 71
You are troubleshooting problems with DHCP in relation to lightweight APs. They vendor class identifier (VCI) is not specified in the DHCP server. When you contact vendor support, they inform you that it is not necessary.
When is this information true?
- A. When only one AP exists on the subnet
- B. When only one client option 60 value is required
- C. When only one client option 43 value is required
- D. When the DHCP server is directly connected to the subnet
Answer: C
NEW QUESTION # 72
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:
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.
NEW QUESTION # 73
According to the IEEE 802.11 standard, what is one structural difference between a MAC Protocol Data Unit (MPDU) and a MAC Management Protocol Data Unit (MMPDU)?
- A. Both the MPDU and MMPDU have a QoS Control (QC) field, but all bits of the MMPDU's QC field are always 0.
- B. An MMPDU header may only contain three address fields, but an MPDU may have four address fields.
- C. The MMPDU frame body is limited to 300 bytes, whereas the MPDU frame body can carry up to
2304 bytes. - D. The MPDU frame's FCS field is 4 bytes, while the MMPDU frame's FCS field is 8 bytes.
- E. The MPDU header always places the BSSID in the first address field, but in the MMPDU the BSSID can be found in any of the address fields.
Answer: B
NEW QUESTION # 74
What is the purpose of a PHY preamble?
- A. It indicates to the PHY the modulation that shall be used for transmission (and reception) of the PSDU.
- B. It communicates important information about the PSDU's length, rate, and upper layer protocol- related parameters.
- C. It provides the receiver(s) with an opportunity for RF channel synchronization prior to the start of the PLCP header.
- D. It provides a cyclic redundancy check (CRC) for the receiving station to validate that the PLCP header was received correctly.
Answer: C
NEW QUESTION # 75
A PHY Header is added to the PSDU at which sub-layer?
- A. Network
- B. LLC
- C. MAC
- D. PHY
Answer: D
Explanation:
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.
NEW QUESTION # 76
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. 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.
- C. The DCF Interframe space (DIFS) is nominally 50 µs, but typically varies by as much as 10 µs, which causes delays in Beacons.
- D. Beacon frames vary in size, and therefore some take slightly longer to send than others.
Answer: A
NEW QUESTION # 77
What must occur before an HT STA operating in an EDCA BSS can transmit a data frame over the wireless medium? (Choose 3)
- A. Its CCA must report that the medium is idle.
- B. The AP must issue the STA a TXOP.
- C. The appropriate interframe space must expire.
- D. The backoff timer for the AC must equal zero.
- E. Its NAV must be equal to one.
- F. The STA must receive a BlockAck, resetting the NAV to zero.
Answer: A,C,D
NEW QUESTION # 78
What is indicated to a QoS AP when a QoS STA sets U-APSD Flag bits to 1 in (Re) Association frames?
- A. Which user priorities are mapped to access categories
- B. Which access categories are scheduled
- C. Which user priorities require use of a TSPEC
- D. Which access categories are both trigger-enabled and delivery-enabled
- E. Which access categories require admission control
Answer: D
NEW QUESTION # 79
What Interframe space would be expected between a CTS and a Data frame?
- A. PIFS
- B. SIFS
- C. DIFS
- D. AIFS
Answer: B
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.
NEW QUESTION # 80
You have received reports of performance problems in a BSS. One specific user is indicating that her downloads are taking a very long time compared to other users around her.
You want to determine if the AP is sending frames multiple times to get through to the user's computer.
Where should you monitor with the protocol analyzer to see retries from the AP in this scenario?
- A. Very near the client STA
- B. Capture from another AP in another BSS
- C. Very near the AP
- D. Directly in the middle of the AP and client STA
Answer: C
NEW QUESTION # 81
While troubleshooting DHCP issues, you perform a protocol capture in order to determine if the DNCP pool is depleted. The capture does not show DHCPnak messages. Where else could you look to determine if the pool is depleted?
- A. Switch logs
- B. DHCP server logs
- C. AP logs
- D. Spectrum analyzer
Answer: B
NEW QUESTION # 82
Given: Protocol analyzer often have useful graphical dashboards providing information about the health and operations of the WLAN.
What is a valid use of a graph showing the Top APs Based on Active Associations?
- A. Evaluating the capacity handling on a specific channel
- B. Ensuring compliance with corporate security policies
- C. Locating overloaded APs
- D. Discovering the total number of client STAs on your network
Answer: C
NEW QUESTION # 83
The manager in the security group is concerned about compliance with security policies on the WLAN. The budget is not available for a full WIPS SOLUTION. He has asked you to implement a process that will verify compliance.
What would you recommend in such a scenario?
- A. Simplify enable 802.11w, which will enforce management frame compliance
- B. Implement AP-based sensors throughout the facility and then monitor for performance issues with these sensors
- C. Use the built-in spectrum analyzer features of the APs to ensure that WPA2-Enterprise is implemented throughout the organization
- D. Use a laptop-based protocol analyzer that provides compliance reporting to monitor the environment on a periodic basis
Answer: D
NEW QUESTION # 84
You're the WLAN administrator for a large retailer based at the HQ in New York. The London- based office has been complaining about WLAN disconnections around lunch time each day. You suspect this might be interference from the staff microwave, how might you test your theory from the New York office?
- A. Ask a local member of staff to take some pictures of the microwave, including some close-ups of the door seal so that you can access it
- B. Access the microwave remotely and run a diagnostic check
- C. Place one of the London APs into spectrum analyzer mode and monitor the situation over lunch time
- D. Ask a local member of staff to change the frequency of the microwave and see if the disconnections stop
Answer: C
Explanation:
The best way to test the theory of microwave interference from the New York office is to use a remote spectrum analyzer. By placing one of the London APs into spectrum analyzer mode, you can capture and analyze the RF spectrum in the London office over lunch time. You can then look for any signs of microwave interference, such as high duty cycle, high amplitude, or frequency hopping on the 2.4 GHz band. This method does not require any physical access to the microwave or any changes to its frequency.
NEW QUESTION # 85
What is the function of the PHY layer?
- A. Convert MSDUs to PPDUs for transmissions and PPDUs to MSDUs 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 PPDUs to PSDUs for transmissions and PSDUs to PPDUs 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.
NEW QUESTION # 86
A manufacturing facility has installed a new automation system which incorporates an 802.11 wireless network. The automation system is controlled from tablet computers connected via the WLAN. However, the automation system has not gone live due to problem with the tablets connecting to the WLAN. The WLAN vendor has been onsite to perform a survey and confirmed good primary and secondary coverage across the facility. As a CWAP you are called in to perform Spectrum Analysis to identify any interference sources.
From the spectrum analysis, you did not identify any interference sources but were able to correctly identify the issue. Which of the following issues did you identify from the spectrum analysis?
- A. The tablets are entering power save mode and failing to wake up to receive the access points transmissions
- B. The tablets are connecting to the wrong SSID
- C. There is a power mismatch between the APs and the clients
- D. A high noise floor has resulted in a SNR of less than 20dB
Answer: C
Explanation:
Explanation
The most likely issue that can be identified from the spectrum analysis is a power mismatch between the APs and the clients. A power mismatch occurs when the APs transmit at a higher power level than the clients, or vice versa. This can cause asymmetric communication, where one side can hear the other, but not vice versa.
This can result in poor performance, disconnections, or packet loss. A spectrum analysis can reveal a power mismatch by showing different signal amplitudes or RSSI values for the APs and the clients on the same channel or frequency. The other options are not correct, as they cannot be identified from the spectrum analysis alone. The tablets' SSID, power save mode, and noise floor can be determined by using other tools or methods, such as protocol analysis, site survey, or device configuration. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 3: Spectrum Analysis, page 79-80
NEW QUESTION # 87
In the 2.4 GHz band, what data rate are Probe Requests usually sent at from an unassociated STA?
- A. MCS 0
- B. The minimum basic rate
- C. 1 Mbps
- D. 6 Mbps
Answer: B
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 # 88
Given: Your network consists of HT and ERP access points, and you are implementing VoWiFi with support for U-APSD.
When an ERP handset operating in WMM Power Save mode with a ReceiveDTIMs parameter of TRUE receives a Beacon containing a DTIM indicating queued broadcast traffic, what task is the handset required to perform?
- A. The handset must broadcast a CTS-to-Self frame indicating the station's need to control the medium long enough to receive all of the broadcast frames.
- B. The handset must send a PS-Poll frame to the access point for every broadcast frame it receives with the More Data bit set to one.
- C. The handset must arbitrate for the medium and immediately issue an RTS directed to the access point with the NAV set to a value of 32,768.
- D. The handset is to remain awake to receive the broadcast frame(s) following the Beacon that contains the DTIM.
Answer: D
NEW QUESTION # 89
You are attempting to work through a user complaint with the CWNP-recommended troubleshooting methodology.
What must be clearly identified in order to reduce the number of possible causes at step three?
- A. The problem
- B. The user name
- C. The user's IP configuration
- D. The device type
Answer: A
NEW QUESTION # 90
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