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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Medium Access | 10% | - Medium access performance analysis - Contention and coordination functions - CSMA/CA and medium access rules - Medium access related issues |
| Topic 2: 802.11 Frame Exchanges | 30% | - Data transfer and protection mechanisms - Frame exchange sequences - Association and authentication processes - Frame exchange troubleshooting |
| Topic 3: Protocol Analysis | 15% | - Capture and decode process - Analysis tools and methods - Protocol analysis fundamentals - Troubleshooting using protocol data |
| Topic 4: PHY Layers and Technologies | 10% | - PHY layer troubleshooting - Modulation and coding schemes - Channelization and frequency usage - 802.11 physical layer standards |
| Topic 5: Spectrum Analysis | 10% | - Spectrum analysis tools - Interference detection and classification - Troubleshooting RF issues - RF spectrum fundamentals |
| Topic 6: MAC Sublayer and Functions | 25% | - MAC frame formats and types - MAC addressing and operations - QoS and power management - MAC layer troubleshooting |
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NEW QUESTION # 21
What is the function of the PHY Preamble?
Answer: D
Explanation:
The function of the PHY preamble is to allow the receiver to detect and synchronize with the signal. The PHY preamble is a part of the PPDU that is transmitted before the PHY header and the PSDU. The PHY preamble consists of a series of training fields that help the receiver to adjust its parameters, such as frequency, timing, and gain, to match the incoming signal. The PHY preamble also helps the receiver to estimate the channel conditions and noise level. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 4:
802.11 Physical Layer, page 99-100
NEW QUESTION # 22
Protocol analyzers require the installation of a customized driver to place a USB adapter into which mode that allows capture of all wireless frames on the channel?
Answer: D
Explanation:
Monitor mode allows a wireless adapter to capture all frames on a channel, including those not addressed to the adapter. Protocol analyzers require a customized driver to enable this mode, which is essential for full WLAN traffic analysis.
NEW QUESTION # 23
Which common feature of a Spectrum Analyzer would be the best to help you locate a non-
802.11 interference source?
Answer: D
Explanation:
A device finder feature helps physically locate the source of non-802.11 interference by providing a directional or proximity-based indication of signal strength. As you move through the environment, the tool guides you toward the strongest RF energy source, making it the most effective feature for tracking down an interfering device.
NEW QUESTION # 24
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)
Answer: C,D,F
NEW QUESTION # 25
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: C
Explanation:
When capturing near the client, both uplink and downlink traffic are visible, confirming that communication between the client and AP is functioning properly. After moving near the AP, only downlink frames are visible while the retry rate remains low, indicating the AP is successfully receiving client frames. This behavior suggests the portable analyzer lacks sufficient receive sensitivity to detect the weaker client transmissions at that location, even though the AP, with better receiver sensitivity, can decode them successfully.
NEW QUESTION # 26
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