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Free PDF 2025 CWNP CWAP-404 Updated Valid Exam Preparation

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CWNP CWAP-404 Exam Topics:

Section
Objectives

Protocol Analysis - 15%

Capture 802.11 frames using the appropriate methods
- Select capture devices

Laptop protocol analyzers
APs, controllers, and other management solutions
Specialty devices (hand-held analyzers and custom-built devices)

- Install monitor mode drivers
- Select capture location(s)
- Capture sufficient data for analysis
- Capture all channels or capture on a single channel as needed
- Capture roaming events

Understand and apply the common capture configuration parameters available in protocol analysis tools
- Save to disk
- Packet slicing
- Event triggers
- Buffer options
- Channels and channel widths
- Capture filters
- Channel scanning and dwell time

Analyze 802.11 frame captures to discover problems and find solutions
- Use appropriate display filters to view relevant frames and packets
- Use colorization to highlight important frames and packets
- Configure and display columns for analysis purposes
- View frame and packet decodes while understanding the information shown and applying it to the analysis process
- Use multiple adapters and channel aggregation to view captures from multiple channels
- Implement protocol analyzer decryption procedures
- View and use a capture’s statistical information for analysis
- Use expert mode for analysis
- View and understand peer maps as they relate to communications analysis

Utilize additional tools that capture 802.11 frames for analysis and troubleshooting
- WLAN scanners and discovery tools
- Protocol capture visualization and analysis tools
- Centralized monitoring, alerting, and forensic tools

Ensure appropriate troubleshooting methods are used with all analysis types
- Define the problem
- Determine the scale of the problem
- Identify probable causes
- Capture and analyze the data
- Observe the problem
- Choose appropriate remediation steps
- Document the problem and resolution

Spectrum Analysis - 10%

Capture RF spectrum data and understand the common views available in spectrum analyzers
- Install, configure, and use spectrum analysis software and hardware
- Capture RF spectrum data using handheld, laptop-based, and infrastructure spectrum capture solutions
- Understand and use spectrum analyzer views

Real-time FFT
Waterfall, swept spectrogram, density, and historic views
Utilization and duty cycle
Detected devices
WLAN integration views

Analyze spectrum captures to identify relevant RF information and issues
- RF noise floor in an environment
- Signal-to-Noise Ratio (SNR) for a given signal
- Sources of RF interference and their locations
- RF channel utilization
- Non-Wi-Fi transmitters and their impact on WLAN communications
- Overlapping and non-overlapping adjacent channel interference
- Poor performing or faulty radios

Analyze spectrum captures to identify various device signatures
- Identify various 802.11 PHYs

DSSS
OFDM
OFDMA
Channel widths
Primary channel

- Identify non-802.11 devices based on RF behaviors and signatures

Frequency hopping devices
IoT devices
Microwave ovens
Video devices
RF Jammers
Cordless phones

Use centralized spectrum analysis solutions
- AP-based spectrum analysis
- Sensor-based spectrum analysis

PHY Layers and Technologies - 10%

Understand and describe the functions of the PHY layer and the PHY protocol data units (PPDUs)
- DSSS (Direct Sequence Spread Spectrum)
- HR/DSSS (High Rate/Direct Sequence Spread Spectrum)
- OFDM (Orthogonal Frequency Division Multiplexing)
- ERP (Extended Rate PHY)
- HT (High Throughput)
- VHT (Very High Throughput)
- HE (High Efficiency)

HE SU PPDU
HE MU PPDU
HE ER SU PPDU
HE TB PPDU
HE NULL data packets

Apply the understanding of PHY technologies, including PHY headers, preambles, training fields, frame aggregation, and data rates, to captured data

Identify and use PHY information provided within pseudo-headers in protocol analyzers
- Pseudo-Header formats

Radiotap
Per Packet Information (PPI)

- Key pseudo-header content

Guard intervals
Resource units allocation
PPDU formats
Signal strength
Noise
Data rate and MCS index
Length information
Channel center frequency or received channel
Channel properties

Recognize the limits of protocol analyzers to capture PHY information including NULL data packets and PHY headers

Use appropriate capture devices based on proper understanding of PHY types
- Supported PHYs
- Supported spatial streams

MAC Sublayer and Functions - 25%

Understand frame encapsulation and frame aggregation
- Frame aggregation (A-MSDU and A-MPDU)

Identify and use MAC information in captured data for analysis
- Management, Control, and Data frames
- MAC frame formats and contents

Frame Control field
To DS and From DS fields
Address fields
Frame Check Sequence (FCS) field

- 802.11 Management frame formats

Information Elements
Authentication
Association and Reassociation
Beacon
Prove Request and Probe Response

- Data and QoS Data frame formats
- 802.11 Control frame formats

Acknowledgement (ACK)
Request to Send/Clear to Send (RTS/CTS)
Block Acknowledgement and related frames
Trigger frames
VHT/HE NDP announcements
Multiuser RTS

Validate BSS configuration through protocol analysis
- Country code
- Minimum basic rate
- Supported rates and coding schemes
- Beacon interval
- WMM settings
- RSN settings
- HT/VHT/HE operations
- Channel width
- Primary channel
- Hidden or non-broadcast SSIDs

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CWNP Certified Wireless Analysis Professional Sample Questions (Q97-Q102):

NEW QUESTION # 97
You are using the real-time FFT display of a spectrum analyzer. In what domain does this show the RF energy detected in the swept frequencies?

A. Frequency
B. Length
C. Phase
D. Time

Answer: C

NEW QUESTION # 98
In a Spectrum Analyzer the Swept Spectrogram plot displays what information?

A. RF power present at a particular frequency over the course of time
B. The RF time domain
C. Duty cycle in the frequency domain
D. Wi-Fi Device information

Answer: A

Explanation:
The Swept Spectrogram plot is a spectrum analysis plot that shows the RF power present at a particular frequency over the course of time. It can help identify trends and patterns in the RF spectrum over a longer period of time. It can also show how the RF environment changes over time and how different sources of RF signals affect each other. The other options are not correct, as they describe different types of plots or information that are not related to the Swept Spectrogram plot.

NEW QUESTION # 99
In a Spectrum Analyzer the Swept Spectrogram plot displays what information?

A. RF power present at a particular frequency over the course of time
B. The RF time domain
C. Wi-Fi Device information
D. Reductions in frame transmissions

Answer: A

Explanation:
Explanation
The Swept Spectrogram plot is a spectrum analysis plot that shows the RF power present at a particular frequency over the course of time. It can help identify trends and patterns in the RF spectrum over a longer period of time. It can also show how the RF environment changes over time and how different sources of RF signals affect each other. The other options are not correct, as they describe different types of plots or information that are not related to the Swept Spectrogram plot. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 72-73

NEW QUESTION # 100
What should the To DS and From DS flags be to set to in an Association Response frame?

A. To DS - 1, From DS = 0
B. To DS - 0, From DS = 0
C. To DS = 0, From DS = 1
D. To DS = 1, From DS = 1

Answer: B

Explanation:
Explanation
The To DS and From DS flags should be set to 0 in an Association Response frame. An Association Response frame is a type of management frame that is transmitted by an AP to accept or reject an association request from a STA. The To DS (To Distribution System) and From DS (From Distribution System) flags are two bits in the Frame Control field of the MAC header that indicate whether a frame is destined for or originated from the DS (Distribution System), which is a system that connects multiple BSSs together. The To DS and From DS flags can have four possible combinations: 00, 01, 10, or 11. For an Association Response frame, which is sent from an AP to a STA within a BSS, both flags should be set to 0. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 5: 802.11 MAC Sublayer, page 121-122

NEW QUESTION # 101
Which one of the following is not a valid reason for an AP to fail a STAs association?

A. Does not support the specified authentication algorithm
B. Requesting station has the wrong PSK
C. Requesting station does not support all the required data rates
D. AP is unable to handle additional associations

Answer: B

NEW QUESTION # 102
......

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