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CWNP CWAP-405 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: WLAN Medium Access	10%	- CSMA/CA and medium access rules - Medium access performance analysis - Contention and coordination functions - Medium access related issues
Topic 2: MAC Sublayer and Functions	25%	- MAC frame formats and types - QoS and power management - MAC addressing and operations - MAC layer troubleshooting
Topic 3: 802.11 Frame Exchanges	30%	- Frame exchange troubleshooting - Frame exchange sequences - Association and authentication processes - Data transfer and protection mechanisms
Topic 4: Protocol Analysis	15%	- Protocol analysis fundamentals - Capture and decode process - Troubleshooting using protocol data - Analysis tools and methods
Topic 5: PHY Layers and Technologies	10%	- 802.11 physical layer standards - Modulation and coding schemes - Channelization and frequency usage - PHY layer troubleshooting
Topic 6: Spectrum Analysis	10%	- Interference detection and classification - RF spectrum fundamentals - Troubleshooting RF issues - Spectrum analysis tools

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CWNP Certified Wireless Analysis Professional Sample Questions (Q15-Q20):

NEW QUESTION # 15
ABC Company is having VoWiFi latency problems on their 802.11g WLAN. A wireless administrator has noticed in the phone's client utilities software that the MAC CRC Error count is higher on stations with problems than on those client stations without problems. A high MAC CRC Error count is attributable to which of the following? (Choose 3)

A. Dynamic Rate Switching algorithms that decrease data rates for latency-sensitive applications
B. 2.4 GHz ISM band interference from sources such as wireless video cameras and analog phones
C. Co-located DCF and EDCA access points that are using non-overlapping 2.4 GHz channels
D. Two access points with overlapping coverage on a single channel
E. High collision rates due to dense population of voice stations and no admission control
F. High multipath conditions due to an RF environment with highly reflective materials

Answer: B,E,F

NEW QUESTION # 16
Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection.
The CRC is calculated over what?

A. Frame Body only
B. PHY Header and Mac Header only
C. Mac Header and Frame Body only
D. PHY Header, MAC Header and Frame Body

Answer: C

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. References: [Wireless Analysis Professional Study Guide CWAP-
405], Chapter 4: 802.11 Physical Layer, page 97-98

NEW QUESTION # 17
Finish the statement:
It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.

A. ERP and VHT
B. HR/DSSS and ERP
C. OFDM and HT
D. HT and VHT

Answer: C

Explanation:
It is possible to distinguish between OFDM 20 MHz transmissions and HT 20 MHz transmissions when looking at an FFT plot. OFDM and HT are two different modulation schemes used by 802.11 WLANs.
OFDM is used by legacy 802.11a/g devices, while HT is used by newer 802.11n/ac devices. OFDM and HT have different spectral characteristics that can be observed on an FFT plot. OFDM transmissions have a flat spectrum with sharp edges, while HT transmissions have a tapered spectrum with rounded edges. This is because HT uses guard intervals and cyclic prefixes to reduce inter-symbol interference and improve performance. The other options are not correct, as they do not describe different modulation schemes or channel widths that can be distinguished on an FFT plot. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 3: Spectrum Analysis, page 70-71

NEW QUESTION # 18
Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A- MPDU?

A. A-MPDU flag in the QoS Control Field
B. The Aggregation flag in the Radio Tap Header
C. The HT Operation Element
D. A-MPDU flag in the Frame Control Field

Answer: B

Explanation:
In a protocol analyzer, you would find an indication that a frame was transmitted as part of an A-MPDU by looking at the Aggregation flag in the Radio Tap Header. The Radio Tap Header is a pseudo-header that is added by some wireless capture devices to provide additional information about the physical layer characteristics of a frame. The Aggregation flag is one of the fields in this header, and it indicates whether the frame belongs to an A-MPDU or not. If the flag is set to 1, it means that the frame is part of an A-MPDU; if it is set to 0, it means that the frame is not part of an A-MPDU . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 9: PHY Layer Frame Formats and Technologies, page 303; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 9: PHY Layer Frame Formats and Technologies, page 304.

NEW QUESTION # 19
Which statement accurately describes IEEE 802.11 Power Save operation in a Basic Service Set that does not support the QoS facility?

A. After waking at a scheduled TBTT, client stations send Null Function frames to the access point with the Power Management bit set back to zero.
B. Following a period of time in a low power state, client stations wake themselves and automatically poll the access point for traffic using a PS-Poll frame.
C. Upon receiving traffic for a dozing station, the access point wakes the client station using a PS- Poll frame so that the client station can receive the data.
D. When the access point's buffer is full, the access point wakes all client stations using a PS-Poll frame so that they can receive the data.
E. After waking from a low power state, client stations listen for the next Beacon to determine if sending a PS-Poll frame to the access point is necessary.

Answer: E

NEW QUESTION # 20
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