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| Section | Weight | Objectives |
|---|---|---|
| 802.11 Frame Exchanges | 30% | - Frame exchange sequences - Association and authentication processes - Data transfer and protection mechanisms - Frame exchange troubleshooting |
| PHY Layers and Technologies | 10% | - Modulation and coding schemes - Channelization and frequency usage - 802.11 physical layer standards - PHY layer troubleshooting |
| Protocol Analysis | 15% | - Analysis tools and methods - Protocol analysis fundamentals - Troubleshooting using protocol data - Capture and decode process |
| MAC Sublayer and Functions | 25% | - QoS and power management - MAC frame formats and types - MAC layer troubleshooting - MAC addressing and operations |
| WLAN Medium Access | 10% | - Contention and coordination functions - Medium access performance analysis - Medium access related issues - CSMA/CA and medium access rules |
| Spectrum Analysis | 10% | - Spectrum analysis tools - Troubleshooting RF issues - Interference detection and classification - RF spectrum fundamentals |
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NEW QUESTION # 48
Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A- MPDU?
Answer: D
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 # 49
Using a portable analyzer you perform a packet capture next to a client STA and you can see that the STA is associated to a BSS. You observe the STA sending packets to the AP and the AP sending packets to the STA.
Less than 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still less than 2%, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?
Answer: B
Explanation:
Receive sensitivity is the minimum signal level that a receiver can detect and decode. Different devices may have different receive sensitivity levels depending on their hardware specifications and antenna configurations. In this scenario, the portable analyzer has a lower receive sensitivity than the AP, meaning that it requires a stronger signal to capture the packets from the client STA. The AP, on the other hand, has a higher receive sensitivity and can receive the packets from the client STA even if they have a weaker signal. This explains why the portable analyzer can only see unidirectional traffic from the AP to the client when capturing near the AP5 References:
* CWAP-403 Study Guide, Chapter 4: PHY Layer Analysis, page 121
* CWAP-403 Objectives, Section 4.3: Analyze PHY layer metrics
NEW QUESTION # 50
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?
Answer: C
Explanation:
Directly observing the problem is the most critical step because it allows the troubleshooter to validate symptoms firsthand, correlate user reports with actual behavior, and eliminate assumptions. Firsthand observation ensures that analysis is based on verified evidence rather than secondhand descriptions, forming a reliable foundation for accurate diagnosis.
NEW QUESTION # 51
Which one of the following portions of information is communicated by bits in the PHY Header?
Answer: B
Explanation:
The PHY header contains signaling bits that indicate transmission parameters such as the modulation and coding scheme, which directly defines the data rate of the frame. This information allows the receiver to correctly interpret how the remainder of the PPDU is encoded and decode the data accordingly.
NEW QUESTION # 52
As the WLAN engineer in your organization, you must troubleshoot performance problems related to co- channel interference (CCI).
What is a good measurement of CCI impact in addition to the number of APs seen on a channel?
Answer: C
NEW QUESTION # 53
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