CWAP-405 Certification Overview – [Oct 09, 2026] Latest CWAP-405 PDF Dumps [Q17-Q32]

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CWAP-405 Certification Overview – [Oct 09, 2026] Latest CWAP-405 PDF Dumps

The Best CWNP CWAP-405 Study Guides and Dumps of 2026

CWNP CWAP-405 Exam Syllabus Topics:

Section	Objectives
Topic 1: Spectrum Analysis and Tools	– Interference Identification (Wi-Fi and Non-Wi-Fi) – Spectrum Analyzer Usage – Wireshark and Packet Capture Analysis
Topic 2: Wireless Troubleshooting and Performance Analysis	– Throughput and Latency Analysis – Common WLAN Failure Scenarios – Identifying WLAN Performance Issues
Topic 3: WLAN Protocol Analysis	– 802.11 Frame Structure and Fields – MAC Layer Operations and Behaviors – Frame Types and Exchanges (Management, Control, Data)
Topic 4: RF and PHY Layer Analysis	– RF Propagation and Signal Behavior – Channelization and Spectrum Usage – 802.11 PHY Standards Overview

Q17. You have captured 802.11 traffic using an adapter that includes the radio tap header. You see several frames often called announcement frames in the capture.
What best describes these types of frames?

They only include beacon and probe request frames

They are used to allow a STA to awake from sleep and for no other reason

They only include beacon and probe response frames

They are meant to provide information to the network that may result in state changes, but they are not open for rejection

Q18. What is used in the PHY header of 802.11ax transmissions to identify stations that are included in an OFDMA RU-based multi-user transmission?

Station ID

Station MAC address

Station IP address

Station TCP port

In 802.11ax (Wi-Fi 6), the PHY header includes a Station ID (STA-ID) to identify which stations are assigned to specific Resource Units (RUs) during OFDMA multi-user transmissions. This allows multiple clients to be scheduled and coordinated efficiently at the PHY layer.

Q19. Which one of the following cannot typically be determined using a Spectrum Analyzer without Wi- Fi integration?

Channel Utilization

SNR

Device Location

Data Rate

A spectrum analyzer without Wi-Fi integration can measure RF energy, channel utilization, and even assist in device location through signal strength readings, but it cannot decode 802.11 frames. Since data rate is derived from frame-level information, it cannot be determined without Wi-Fi protocol analysis.

Q20. Given: Adjacent Channel Interference (ACI) can cause frame corruption and poor performance in WLANs.
You are using a protocol analyzer in the attempt to detect ACI.
What should you look for in such a scenario?

Look at Retry counts

Capture on the channel you think may be impacted by ACI and see if any frames are captured from adjacent channels

Look for frames with a low signal strength value in the radio tap header

Look at CRC errors

Q21. Why is a high CRC error rate in L2 protocol analysis software NOT always a valid indicator of network performance? (Choose 3)

If protocol analysis software is not properly configured with frame decryption parameters, it can’t accurately calculate a CRC, which includes the encrypted frame body contents.

If the protocol analysis radio hardware is not located in the same area as intended client devices or APs, its data sampling may not be representative of actual traffic on the network.

Radio and antenna hardware used for protocol analysis may not match the receive sensitivity, diversity, MIMO, or antenna gain capabilities of the network WLAN hardware.

Layer 2 protocol analysis can only collect and interpret data that is received properly at the MAC layer, and cannot quantify some PHY-layer problems.

Q22. Your organization would like to give their network field engineers a tool to provide an overview of a given wireless LAN environment. They are interested in how many SSIDs are enabled per radio, channels used, and the number of APs per channel. They do not want to require the engineers to view multiple frames to determine the information. Which tool would you recommend that provides this information at the lowest cost?

Spectrum Analyzer

Protocol Analyzer

WLAN Scanner

Site Survey Software

A WLAN scanner is the lowest-cost tool that quickly shows SSIDs per radio, channel usage, and the number of APs per channel without requiring detailed frame analysis. It provides a clear overview of the WLAN environment, making it ideal for field engineers.

Q23. As the WLAN administrator in your organization you are responsible for troubleshooting connection issues.
Several STAs are connecting to the network, but are unable to communicate after connection. You suspect a DHCP problem. After capturing traffic on the wired-side of the AP, you want to view only DHCP traffic.
What filter in Wireshark can be used for this purpose?

DHCPv6

DHCP

BOOTP

DHCPv4

Q24. After performing a protocol analysis capture on channel 36 you are looking at the radio tap header of a data frame and notice the frame was transmitted at MCS 0 on one spatial stream. At what data rate was the PHY Header for this frame transmitted?

1 Mbps

2 Mbps

6 Mbps

6.5 Mbps

On channel 36 (5 GHz band), the PHY header is always transmitted using one of the basic OFDM rates to ensure all devices can decode it. For 802.11a/n/ac in 5 GHz, the PHY header is sent at 6 Mbps, regardless of the MCS rate used for the data portion of the frame.

Q25. How many frames are exchanged for 802.11 authentication in the 6 GHz band when WPA3- Enterprise is not used, and a passphrase is used instead?

In the 6 GHz band, WPA3 with SAE (when a passphrase is used instead of WPA3-Enterprise) requires an SAE authentication exchange. SAE authentication consists of two frames: a commit and a confirm. These two frames complete the authentication phase before association proceeds.

Q26. Which piece of information must be transmitted in a Reassociation Request frame for a PMK Caching roam to be successful?

PMK

PMKID

PTK

PTKID

For a PMK Caching roam, the client includes the PMK Identifier (PMKID) in the Reassociation Request. This allows the new AP to quickly identify the pre-shared Pairwise Master Key (PMK) without performing a full 802.1X authentication, enabling a fast and seamless roam.

Q27. How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?

The VoIP phone transmits a PS-Poll frame

The VoIP phone sets the More Data bit in the MAC Header to 1

The VoIP phone transmits a WMM Action frame

The VoIP phone transmits a trigger frame, which is a QoS Null frame or a QoS Data frame

A VoIP phone, using WMM Power Save, requests data frames buffered at the AP by transmitting a trigger frame, which is a QoS Null frame or a QoS Data frame. WMM Power Save is a power saving mode that allows a STA (station) to conserve battery power by periodically sleeping and waking up. WMM Power Save is based on WMM (Wi-Fi Multimedia), which is a QoS (Quality of Service) enhancement that provides prioritized and differentiated access to the medium for different types of traffic. When a STA sleeps, it cannot receive any data frames from the AP, so it informs the AP of its power save status by setting a bit in its MAC header. The AP then buffers any data frames destined for the sleeping STA until it wakes up. When a STA wakes up, it sends a trigger frame to the AP, indicating its AC (Access Category), which is a logical queue that corresponds to its QoS level. A trigger frame can be either a QoS Null frame or a QoS Data frame, depending on whether it has any payload or not. The AP then responds with one or more data frames from the same AC as the trigger frame, followed by an ACK or BA (Block Acknowledgement) frame from the STA.
The other options are not correct, as they are not used by a VoIP phone using WMM Power Save to request data frames buffered at the AP. A PS-Poll (Power Save Poll) frame is used by a STA using legacy power save mode, not WMM Power Save mode, to request data frames buffered at the AP. A PS-Poll frame does not indicate any AC or QoS information. Setting the More Data bit in the MAC header to 1 does not request any data frames from the AP, but indicates that there are more data frames to be sent by the STA or received by the STA. Transmitting a WMM Action frame does not request any data frames from the AP, but performs various management actions related to WMM features, such as admission control, parameter update, etc. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page
198-199

Q28. Which one of the following statements is true regarding the EAPoL-Start frame?

All 802.1x/EAP exchanges must begin with an EAPoL-Start message from the AP

A STA may optionally initiate the EAP exchange with an EAPoL-Start Frame

EAPoL-Start frames are only required for tunneled EAP types

EAPoL-Start frames are only used for wired 802.1X authentication

In 802.1X/EAP over LAN (EAPoL), the client station can optionally send an EAPoL-Start frame to trigger the authentication process. If the client does not send it, the authenticator (AP) will typically initiate the exchange after detecting the STA.

Q29. You must report on frame types seen on the WLAN. You want to list the frame types by both name and binary value.
What frame type is represented by the binary value 011010, which includes the Type and Subtype values?

Beacon

PS-Poll

Authentication

Association Request

References:

Q30. Which one of the following portions of information is communicated by bits in the PHY Header?

Signal strength

Data rate

SNR

Noise

The PHY header contains signaling bits that indicate transmission parameters such as the modulation and coding scheme, which directly defines the data rate of the frame. This information allows the receiver to correctly interpret how the remainder of the PPDU is encoded and decode the data accordingly.

Q31. In an infrastructure network, which statement is true concerning the “Power Management” bit and
“More Data” bit in the Frame Control field of the MAC header?

The “Power Management” bit should only be set by a client STA and the “More Data” bit should only be set by the AP.

The “Power Management” bit should only be set by the AP and the “More Data” bit should only be set by a client STA.

The “Power Management” bit and the “More Data” bit should only be set by the AP.

The “Power Management” bit and the “More Data” bit should only be set by a client STA.

In an infrastructure WLAN, the client STA sets the Power Management bit to signal when it is entering or exiting power save mode. The AP sets the More Data bit to indicate that additional buffered frames are waiting for a client STA, allowing proper coordination of frame delivery.

Q32. You have deployed a new 802.11ac WLAN for a customer who wants to take advantage of
802.11ac standardized Transmit Beamforming. After the installation you perform a protocol capture to confirm Transmit Beamforming is operating as expected. When analyzing the protocol exchange you observe the beamformer transmits a VHT NDP Announcement frame but you never see the transmitted NDP. What do you conclude from this behavior?

NDPs are PHY PPDUs which contain no MPDU and therefore will not be displayed in a protocol analyzer.

This is normal, 802.11ac includes the NDP within the VHT NDP Announcement.

This indicates the beamformer is misconfigured.

This behavior is non-standard and is likely a bug with the current driver.

Null Data Packets (NDPs) used in 802.11ac beamforming are PHY-layer constructs without MAC frames. Since protocol analyzers capture at the MAC layer, NDPs do not appear in the capture even though they are transmitted, which is why only the VHT NDP Announcement is visible.

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