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完全覆蓋的最新CWAP-404考題|第一次嘗試輕鬆學習並通過考試和準確的CWNP Certified Wireless Analysis Professional
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CWNP CWAP-404 考試大綱：
| 主題 |
簡介 |
| 主題 1 |
- WLAN Medium Access: The exam evaluates the understanding of a wireless network professional about 802.11 contention algorithms and their impact on WLAN performance. The CWAP-404 exam requires candidates to analyze QoS configurations and operations.
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| 主題 2 |
- PHY Layers and Technologies: In the topic, the CWAP-404 exam tests the understanding of a wireless network professional about the Physical (PHY) layer functions and technologies. Wireless analysts need to describe and apply knowledge of PHY headers, PPDUs, and other PHY-related data. This topic ensures that analysts are proficient in interpreting PHY information within protocol analyzers and can select appropriate capture devices for different PHY types.
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| 主題 3 |
- Protocol Analysis: The topic in the CWNP CWAP-404 exam evaluates the skill of a wireless network professional to capture and analyze 802.11 frames effectively. Candidates must demonstrate proficiency in configuring protocol analysis tools, interpreting frame captures to diagnose issues, and applying appropriate troubleshooting methods.
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| 主題 4 |
- Frame Exchanges: The topic evaluates the skills of a wireless network professional in capturing, understanding, and analyzing various frame exchanges, including BSS discovery, joining, roaming, and data frames. The CWAP-404 exam targets the ability of candidates to troubleshoot and resolve issues related to MAC layer operations, ensuring they can maintain robust and efficient WLAN communications.
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>> 最新CWAP-404考題 <<
CWAP-404熱門證照，新版CWAP-404考古題
CWNP的CWAP-404考試認證是屬於那些熱門的IT認證，也是雄心勃勃的IT專業人士的夢想，這部分考生需要做好充分的準備，讓他們在CWAP-404考試中獲得最高分，使自己的配置檔相容市場需求。
最新的 CWAP Wi-Fi Analysis CWAP-404 免費考試真題 (Q83-Q88):
問題 #83
Finish the statement:
It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.
- A. HR/DSSS and ERP
- B. OFDM and HT
- C. ERP and VHT
- D. HT and VHT
答案：B
解題說明：
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-404], Chapter 3: Spectrum Analysis, page 70-71
問題 #84
Which one of the statements regarding the Frame Control field in an 802.11 MAC header is true?
- A. The Frame Control field contains three sub-fields and eight one-bit flags
- B. Only Control frames have a Frame Control field
- C. The Frame Control field is always set to 0
- D. The Frame Control field is used to communicate the duration value
答案：A
解題說明：
Explanation: The Frame Control field in the 802.11 MAC header contains several sub-fields that define control information about the frame, including the type of frame, whether the frame is fragmented, and other parameters. Specifically, the Frame Control field has two main parts:
The sub-fields include Protocol Version, Type, Subtype, etc.
It also contains eight one-bit flags such as To DS, From DS, More Fragments, Retry, Power Management, etc.
問題 #85
Given: Your network consists of HT and ERP access points, and you are implementing VoWiFi with support for U-APSD.
When an ERP handset operating in WMM Power Save mode with a ReceiveDTIMs parameter of TRUE receives a Beacon containing a DTIM indicating queued broadcast traffic, what task is the handset required to perform?
- A. The handset must arbitrate for the medium and immediately issue an RTS directed to the access point with the NAV set to a value of 32,768.
- B. The handset must send a PS-Poll frame to the access point for every broadcast frame it receives with the More Data bit set to one.
- C. The handset must broadcast a CTS-to-Self frame indicating the station's need to control the medium long enough to receive all of the broadcast frames.
- D. The handset is to remain awake to receive the broadcast frame(s) following the Beacon that contains the DTIM.
答案：D
問題 #86
During a VHT Transmit Beamforming sounding exchange, the beamformee transmits a Compressed Beamforming frame to the beamformer. What is communicated within this Compressed Beamforming frame?
- A. Steering Matrix
- B. Beamforming Matrix
- C. Beamformee Matrix
- D. Feedback Matrix
答案：D
解題說明：
The beamformee transmits a Feedback Matrix within the Compressed Beamforming frame to the beamformer. The Feedback Matrix contains information about the channel state between the beamformee and each spatial stream of the beamformer. This information is used by the beamformer to adjust its transmit weights and optimize its signal for the beamformee.
問題 #87
As a WLAN consultant, you have been asked to troubleshoot a problem with a single wireless client station (Station-Z). Your customer informs you that other wireless client stations are not having problems with wireless connectivity, and that Station-Z is configured in the same manner as all other wireless client stations on the network. Station-Z is showing an unusually high retransmission count in its client utility statistics. Using a wireless protocol analyzer, where and how should you begin troubleshooting this problem? (Choose 2)
- A. Position the analyzer near the access point. See if Station-Z's frames are reaching the access point and if so, analyze their signal strength.
- B. Position the analyzer near Station-Z. Analyze the frames Station-Z is receiving, looking for delayed ACK frames.
- C. Position the analyzer halfway between Station-Z and the access point. Measure the distance between Station-Z and the access point.
- D. Position the analyzer halfway between Station-Z and the access point. Analyze the data rate at which frames are sent and how long they take to be received.
- E. Position the analyzer near Station-Z. Analyze Station-Z's transmissions and acknowledgements.
Look for RF and obstacle-induced interference.
答案：A,E
問題 #88
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