Free CWAP-404: Certified Wireless Analysis Professional Exam Questions and Answers
49 verified practice questions for CWAP-404.
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Last updated: September 19, 2026
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- CWAP-404
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- CWNP
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Question #1
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?
Please select an optionIncorrectCorrect answer: D
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. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 64
Was this answer correct?Question #2
Prior to a retransmission what happens to the CWmax value?
Please select an optionIncorrectCorrect 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-404], Chapter 7: QoS Analysis, page 196-197
Was this answer correct?Question #3
What does the value of the Listen Interval field in an Association Request frame indicate?
Please select an optionIncorrectCorrect answer: C
The value of the Listen Interval field in an Association Request frame indicates how often a STA in power save mode wakes up to listen to Beacon frames. The Listen Interval is expressed in units of Beacon Intervals (typically 100 TU or 102.4 ms). For example, if the Listen Interval is set to 10, it means that the STA will wake up every 10 Beacon Intervals (or about 1 second) to check for buffered frames at the AP. The Listen Interval is used by the AP to determine how long it can hold frames for a STA in power save mode before discarding them . References: CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 197; CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 198.
Was this answer correct?Question #4
A PHY Header is added to the PSDU at which layer?
Please select an optionIncorrectCorrect 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-404], Chapter 4: 802.11 Physical Layer, page 97-98
Was this answer correct?Question #5
Which one of the following is an advantage of using display filters that is not an advantage of capture-time filters?
Please select an optionIncorrectCorrect answer: C
Display filters are applied after the capture is completed and they only hide the packets from view. The filtered packets are still present in the capture file and can be enabled for view later by changing or removing the display filter. This is an advantage over capture-time filters, which discard the packets that do not match the filter criteria and cannot be recovered later34 References: • CWAP-403 Study Guide, Chapter 2: Protocol Analysis, page 37 • CWAP-403 Objectives, Section 2.3: Apply display filters
Was this answer correct?Question #6
Which one of the following is required for Wi-Fi integration in laptop-based Spectrum Analyzer software in addition to the spectrum analysis adapter?
Please select an optionIncorrectCorrect answer: A
An 802.11 wireless adaptor is required for Wi-Fi integration in laptop-based spectrum analyzer software in addition to the spectrum analysis adapter. The spectrum analysis adapter is a hardware device that captures the RF signals in the wireless environment and sends them to the spectrum analyzer software for analysis and display. The 802.11 wireless adapter is a hardware device that connects the laptop to the wireless network and allows the spectrum analyzer software to correlate the RF data with the Wi-Fi data, such as SSID, channel, and BSSID. This enables the spectrum analyzer software to provide more context and insight into the spectrum activity and its impact on the Wi-Fi network. A firmware upgrade for the spectrum analysis adapter is not required for Wi-Fi integration, but it may be needed to fix bugs or add features to the device. A directional antenna is an antenna that focuses the RF energy in a specific direction and has a high gain and a narrow beamwidth. A directional antenna can be used with a spectrum analysis adapter to pinpoint the location or source of interference or noise in the wireless environment, but it is not required for Wi-Fi integration. SNMP read credentials to the WLAN controller or APs are not required for Wi-Fi integration, but they may be useful for obtaining additional information about the wireless network configuration and performance from the network devices.References: • CWAP-404 Study Guide, Chapter 4: Spectrum Analysis and Troubleshooting, page 123 • CWAP-404 Objectives, Section 4.2: Integrate Wi-Fi data with spectrum analysis data • CWAP-404 Study Guide, Chapter 4: Spectrum Analysis and Troubleshooting, page 131
Was this answer correct?Question #7
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?
Please select an optionIncorrectCorrect answer: C
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 . References: CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11: 802.11n/ac/ax PHYsical Layer Frame Exchanges, page 378; CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 11: 802.11n/ac/ax PHYsical Layer Frame Exchanges, page 379.
Was this answer correct?Question #8
What is an AIFS?
Please select an optionIncorrectCorrect answer: B
An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An interframe space is a period of time that a STA (station) has to wait before attempting to access the medium. An AIFS is a type of interframe space that varies depending on the AC of the traffic. An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. There are four ACs defined by 802.11e: AC_VO (Voice), AC_VI (Video), AC_BE (Best Effort), and AC_BK (Background). Each AC has a different AIFSN (Arbitration Interframe Space Number) 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 other options are not correct, as they do not describe what an AIFS is. An AIFS is not a medium access method introduced by 802.11n, but never implemented, as it is part of the 802.11e standard and widely used in QoS-enabled WLANs. An AIFS is not a form of aggregation performed at the PHY layer based on 802.11e UP values interpreted from DSCP values, as aggregation is a technique that combines multiple frames into one larger frame to improve efficiency and throughput, not prioritization or medium access. An AIFS is not the shortest period of time a STA can sleep, as sleeping is a power saving mode that allows a STA to conserve battery power by periodically turning off its radio, not accessing the medium. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 7: QoS Analysis, page 194-195
Was this answer correct?Question #9
Which common feature of a Spectrum Analyzer would be the best to help you locate a non-802.11 interference source?
Please select an optionIncorrectCorrect answer: A
The device finder is a common feature of a spectrum analyzer that helps locate a non-802.11 interference source. The device finder uses a directional antenna to measure the signal strength of a specific frequency or signal source. By pointing the antenna in different directions, the device finder can indicate the direction and distance of the interference source. The device finder can also filter out other signals that are not related to the interference source. The other options are not correct, as they do not help locate a non-802.11 interference source. Max hold and min hold are features that show the maximum and minimum RF power levels over time,respectively. Location filter is a feature that filters out signals that are not from a specific location or area. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 3: Spectrum Analysis, page 77-78
Was this answer correct?Question #10
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?
Please select an optionIncorrectCorrect answer: C
Observing the problem is the most important step in the WLAN troubleshooting methodology among those listed. This step involves capturing and analyzing the relevant data from the wireless network, such as packets, frames, spectrum, and performance metrics. Observing the problem helps to verify the existence and scope of the issue, identify the root cause and possible solutions, and validate the results of any actions taken. The other steps are also important, but they are not as critical as observing the problem12 References: • CWAP-404 Study Guide, Chapter 1: Troubleshooting Methodology, page 15 • CWAP-404 Objectives, Section 1.2: Observe the problem
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FAQ
Learn More: https://www.cwnp.com/it-certifications/
- Q1: What are CWNP Certification Exams?
- A: CWNP (Certified Wireless Network Professional) Certification Exams validate your expertise in wireless networking technologies, covering areas such as WLAN design, security, analysis, and troubleshooting. These certifications demonstrate your proficiency in managing and optimizing wireless networks.
- Q2: Why should I pursue CWNP Certification?
- A: CWNP Certification enhances your professional credibility, showcasing your skills and knowledge in wireless networking. This can lead to better job opportunities, higher salaries, and career advancement in the networking and IT industries, especially in roles focused on wireless technologies.
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- A: Benefits include recognition as a certified wireless networking professional, improved job performance, access to exclusive resources, continuing education opportunities, and staying current with the latest wireless networking technologies and best practices.
- Q4: Who should take CWNP Certification Exams?
- A: Network engineers, IT professionals, system administrators, wireless network designers, and anyone involved in designing, implementing, and managing wireless networks should consider these certifications to validate their expertise and advance their careers.
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- A: CWNP offers various certification paths, including:
- Q6: How do I prepare for CWNP Certification Exams?
- A: Preparation can include official CWNP training courses, study guides, practice exams, online tutorials, and hands-on experience with wireless networking technologies.
- Q7: Where can I take CWNP Certification Exams?
- A: CWNP Certification Exams can be taken at authorized Pearson VUE testing centers worldwide or online, providing flexibility to fit your schedule and location.
- Q8: How do CWNP Certifications impact my career?
- A: CWNP Certifications significantly boost your career by demonstrating your expertise to employers, making you a more competitive candidate for advanced roles and promotions in wireless networking and IT.
- Q9: Are there any prerequisites for CWNP Certification Exams?
- A: Some exams may have prerequisites, such as foundational knowledge or prior certifications. Check the specific requirements for each certification path on the CWNP website.
- Q10: How often do I need to recertify for CWNP Certifications?
- A: CWNP Certifications typically require recertification every three years to ensure that certified professionals stay updated with the latest wireless networking technologies and industry practices.