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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

Identify and analyze CRC error frames and retransmitted frames

WLAN Medium Access - 10%

Understand 802.11 contention algorithms in-depth and know how they impact WLANs
- Distributed Coordination Function (DCF)

Carrier Sense (CS) and Energy Detect (ED)
Network Allocation Vector (NAV)
Contention Windows (CW) and random backoff
Interframe spacing

- Enhanced Distributed Channel Access (EDCA)

EDCA Function (EDCAF)
Access Categories and Queues
Arbitration Interframe Space Number (AIFSN)

- Wi-Fi Multimedia (WMM)

WMM parameters
WMM-Power Save
WMM-Admission Control

Analyze QoS configuration and operations
- Verify QoS parameters in capture files
- Ensure QoS is implemented end-to-end

802.11 Frame Exchanges - 30%

CWNP CWAP-404 Exam Certification Details:

Recommended Training
CWAP self-paced training kit, Training Class

Number of Questions
60

Exam Registration
PEARSON VUE

Exam Name
Wireless Analysis Professional

Sample Questions
CWNP CWAP-404 Sample Questions

Exam Price
$275 USD

Passing Score
70%

Duration
90 minutes

CWNP Certified Wireless Analysis Professional Sample Questions (Q159-Q164):

NEW QUESTION # 159
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. Ensuring compliance with corporate security policies
B. Discovering the total number of client STAs on your network
C. Evaluating the capacity handling on a specific channel
D. Locating overloaded APs

Answer: D

NEW QUESTION # 160
As it pertains to HT L-SIG TXOP Protection, what statement is true?

A. Support for L-SIG TXOP Protection is indicated in the HT Capabilities Info field of (re)association request frames sent by ERP, OFDM, and HT-OFDM stations.
B. L-SIG TXOP Protection is specified for the purpose of protecting OFDM (802.11a/g) and HT- OFDM (802.11n) transmissions from HR/DSSS stations.
C. Support for L-SIG TXOP Protection is indicated by HT stations in the L-SIG field of the PLCP header of HT-mixed format frames.
D. An L-SIG TXOP protected frame exchange sequence always begins with an RTS/CTS or a CTS- to-Self.

Answer: D

NEW QUESTION # 161
You are performing a multiple adapter channel aggregation capture to troubleshoot a VoIP roaming problem and would like to measure the roaming time from the last VoIP packet sent on the old AP's channel to the first VoIP packet sent on the new AP's channel. Which timing column in the packet view would measure this for you?

A. Absolute
B. Delta
C. Roaming
D. Relative

Answer: C

Explanation:
The "Roaming" timing column specifically measures the time elapsed between the last packet on the old AP's channel and the first packet on the new AP's channel, providing valuable information about the roaming time in VoIP troubleshooting scenarios.

NEW QUESTION # 162
You are using a Wireless Aggregator utility to combine multiple packet captures.
One capture exists for each of channels 1, 6 and 11.
What kind of troubleshooting are you likely performing with such a tool?

A. Narrowband DoS attack detection.
B. Fast secure roaming problems.
C. Interference source location.
D. Wireless adapter failure analysis.

Answer: B

NEW QUESTION # 163
What is indicated to a QoS AP when a QoS STA sets U-APSD Flag bits to 1 in (Re) Association frames?

A. Which access categories are both trigger-enabled and delivery-enabled
B. Which access categories are scheduled
C. Which user priorities are mapped to access categories
D. Which user priorities require use of a TSPEC
E. Which access categories require admission control

Answer: A

NEW QUESTION # 164
......

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