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| Section | Objectives |
|---|---|
| Topic 1: Wireless Troubleshooting and Performance Analysis | - Common WLAN Failure Scenarios - Throughput and Latency Analysis - Identifying WLAN Performance Issues |
| Topic 2: RF and PHY Layer Analysis | - Channelization and Spectrum Usage - RF Propagation and Signal Behavior - 802.11 PHY Standards Overview |
| Topic 3: WLAN Protocol Analysis | - 802.11 Frame Structure and Fields - MAC Layer Operations and Behaviors - Frame Types and Exchanges (Management, Control, Data) |
| Topic 4: Spectrum Analysis and Tools | - Wireshark and Packet Capture Analysis - Spectrum Analyzer Usage - Interference Identification (Wi-Fi and Non-Wi-Fi) |
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NEW QUESTION # 81
When would you expect to see a Reassociation Request frame'
Answer: B
Explanation:
A Reassociation Request frame is sent every time a STA roams from one AP to another within the same ESS.
A Reassociation Request frame is similar to an Association Request frame, but it also contains the BSSID of the current AP that the STA is leaving. This allows the new AP to coordinate with the old AP and transfer the STA's context information, such as security keys, QoS parameters, and buffered frames. This way, the STA can maintain its connectivity and session continuity during roaming . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 195; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 196.
NEW QUESTION # 82
Protocol analyzers may present field values in either binary, decimal or hexadecimal. What precedes a hexadecimal value to indicate it is hexadecimal?
Answer: A
Explanation:
Hexadecimal values are conventionally prefixed with "0x" to indicate that the number is represented in base 16. This notation distinguishes hexadecimal values from decimal or binary formats in protocol analyzers and programming contexts.
NEW QUESTION # 83
In which field of the MAC header would you find the protected bit and retry bit?
Answer: A
Explanation:
The Frame Control field in the 802.11 MAC header contains control bits including the Protected Frame (indicating encryption) and Retry (indicating retransmission) bits, along with other flags that define the frame type and behavior.
NEW QUESTION # 84
You have installed a new 802.1 lac WLAN configured with 80 MHz channels. Users in one area are complaining about poor performance. This area is currently served by a single AP. You take a spectrum analysis capture in the poor performing area. While examining the waterfall plot you notice the airtime utilization is higher on the first 20 MHz of the 80 MHz channel when compared to the rest of the channel.
What do you conclude?
Answer: C
Explanation:
The most likely cause of higher airtime utilization on the first 20 MHz of the 80 MHz channel is non-Wi-Fi interference. Non-Wi-Fi interference can prevent an AP from using its full channel width, as it will degrade the signal quality and increase the noise floor on some parts of the channel. This will force the AP to fall back to a narrower channel width, such as 20 MHz or 40 MHz, to maintain communication with its clients. The waterfall plot can help identify non-Wi-Fi interference by showing spikes or bursts of RF energy on specific frequencies or sub-channels. The other options are not correct, as they do not explain why only the first 20 MHz of the channel has higher airtime utilization. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 74-75
NEW QUESTION # 85
You are troubleshooting VoIP WLAN issues. When performing a PING to a remote device that would be involved in a call link, you see that the time value averages 220 milliseconds.
How much extra delay beyond that recommend for VoIP links is in this link?
Answer: C
NEW QUESTION # 86
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