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CWNP CWAP-404 Exam Certification Details:
Exam Name
Wireless Analysis Professional
Exam Code
CWAP-404 CWAP
Number of Questions
60
Sample Questions
CWNP CWAP-404 Sample Questions
Recommended Training
CWAP self-paced training kit, Training Class
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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
CWNP Certified Wireless Analysis Professional Sample Questions (Q134-Q139):
NEW QUESTION # 134
Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection. The CRC is calculated over what?
- A. Mac Header and Frame Body only
- B. Frame Body only
- C. PHY Header and MAC Header only
- D. PHY Header, MAC Header and Frame Body
Answer: A
Explanation:
The CRC is calculated over the MAC Header and Frame Body only. The CRC (Cyclic Redundancy Check) is a 32-bit value that is used for error detection in wireless transmissions.
The CRC is calculated over the MAC Header and Frame Body of a PSDU, which are the parts of the data unit that contain information such as source and destination addresses, frame type, frame control, sequence number, payload, etc. The CRC is appended to the end of the PSDU as a FCS (Frame Check Sequence) field. The CRC is not calculated over the PHY Header or PHY Preamble, which are parts of the PPDU that contain information such as modulation, coding, data rate, etc. The PHY Header and PHY Preamble are added or removed by the PHY layer during the conversion between PSDU and PPDU.
NEW QUESTION # 135
The data rate for a data frame is 150 Mbps in 5 GHz.
What rate is used to transmit the PHY header information?
- A. 150 Mbps
- B. 75 Mbps
- C. 6 Mbps
- D. 1 Mbps
Answer: D
NEW QUESTION # 136
Which piece of information Is not transmitted in an HT PDDU header?
- A. Number of Spatial Streams
- B. PPDU length
- C. MCS index
- D. Channel number
Answer: D
Explanation:
The channel number is not transmitted in an HT PPDU header. An HT PPDU header is a part of the PPDU that contains information such as modulation, coding, data rate, and number of spatial streams for an 802.11n transmission. The channel number is not included in the HT PPDU header, as it is determined by the frequency band and channel width that are used by the transmitter and receiver. The channel number can be inferred from the frequency band and channel width, which are indicated by bits in different fields of the HT PPDU header, such as HT- SIG and HT-LTF. The other options are not correct, as they are transmitted in an HT PPDU header. The number of spatial streams, PPDU length, and MCS index are indicated by bits in the HT-SIG field of the HT PPDU header.
NEW QUESTION # 137
When using Wireshark for protocol analysis, what filter will allow you to see only beacon frames?
- A. wlan.fc.type_subtype = =0x0b
- B. wlan.fc.type_subtype = =0x04
- C. wlan.fc.type_subtype = =0x08
- D. wlan.fc.type_subtype = =0x05
Answer: C
NEW QUESTION # 138
In which element of a Beacon frame would you look to identify the current HT protection mode in which an AP is operating?
- A. HT Capabilities Element
- B. HT Operations Element
- C. HT Information Element
- D. HT Protection Element
Answer: C
Explanation:
The HT Information Element in a Beacon frame contains information about the current HT (High Throughput) protection mode in which an access point (AP) is operating. This element is used to ensure backward compatibility between HT (802.11n) and non-HT stations.
NEW QUESTION # 139
......
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