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| Section | Objectives |
|---|---|
| Topic 1: Spectrum Analysis and Tools | - Interference Identification (Wi-Fi and Non-Wi-Fi) - Spectrum Analyzer Usage - Wireshark and Packet Capture Analysis |
| Topic 2: WLAN Protocol Analysis | - Frame Types and Exchanges (Management, Control, Data) - MAC Layer Operations and Behaviors - 802.11 Frame Structure and Fields |
| Topic 3: Wireless Troubleshooting and Performance Analysis | - Throughput and Latency Analysis - Identifying WLAN Performance Issues - Common WLAN Failure Scenarios |
| Topic 4: RF and PHY Layer Analysis | - RF Propagation and Signal Behavior - 802.11 PHY Standards Overview - Channelization and Spectrum Usage |
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NEW QUESTION # 117
What interframe space would be expected between a CTS and a Data frame?
Answer: A
Explanation:
A Short Interframe Space is used between control frames and their immediate responses. After a CTS frame is transmitted, the sender waits a SIFS before transmitting the Data frame, ensuring priority access to the medium and preventing other stations from contending during the protected exchange.
NEW QUESTION # 118
As a wireless network consultant you have been called in to troubleshoot a high-priority issue for one of your customers. The customer's office is based on two floors within a multi-tenant office block. On one of these floors (floor 5) users cannot connect to the wireless network. During their own testing the customer has discovered that users can connect on floor 6 but not when they move to the floor 5. This issue is affecting all users on floor 5 and having a negative effect on productivity.
To troubleshoot this issue, you perform both Spectrum and Protocol Analysis. The Spectrum Analysis shows the presence of Bluetooth signals which you have identified as coming from wireless mice. In the protocol analyzer you see the top frame on the network is Deauthentication frames. On closer investigation you see that the Deauthentication frames' source addresses match the BSSIDs of your customers APs and the destination address is FF:FF:FF:FF:FF:FF:FF.
What do you conclude from this troubleshooting exercise?
Answer: A
Explanation:
The users on floor 5 are being subjected to a denial of service attack, as this is happening across the entire floor it is likely to be a misconfigured WIPS solution belonging to the tenants on the floor below. This is because the Deauthentication frames have a source address that matches the BSSIDs of the customer's APs and a destination address that is a broadcast address (FF:FF:FF:FF:FF:FF). This indicates that someone is sending spoofed Deauthentication frames to all STAs associated with the customer's APs, causing them to disconnect from the wireless network. This is a common type of DoS attack on wireless networks, and it could be caused by a rogue device or a WIPS solution that is configured to protect the wireless network of another tenant on the floor below12. References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 13: Troubleshooting Common Wi-Fi Issues, page 4961; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 14: Troubleshooting Tools, page 5272.
NEW QUESTION # 119
You have been engaged by ABC corporation to troubleshoot a WLAN problem. Users have been reporting random disconnections. You perform Spectrum Analysis as part of your troubleshooting process and notice a frequency hopping signal across the entire 2.4 GHz band. The signal amplitude is -65 dBm and has a duty cycle of 5%. What do you conclude about this frequency hopping signal?
Answer: B
Explanation:
A duty cycle of 5% indicates the frequency hopping signal is active only a small fraction of the time. Even though the amplitude is -65 dBm, its short presence means it rarely overlaps with Wi- Fi transmissions, making it unlikely to cause the reported random disconnections.
NEW QUESTION # 120
You are using a protocol analyzer to troubleshoot a network and you notice a client frequently sending QoS Null Function frames. What do you conclude?
Answer: C
Explanation:
QoS Null Function frames are used by a client to indicate a change in its Power Management status without carrying data. They are normal in WMM Power Save operations, allowing the client to enter or exit power-save mode efficiently.
NEW QUESTION # 121
Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A-MPDU?
Answer: A
Explanation:
An indication that a frame was transmitted as part of an A-MPDU is typically found in the Radio Tap header provided by the capture adapter. The Aggregation flag in this header identifies that the captured frame belongs to an aggregated MPDU transmission, which is information supplied by the radio hardware rather than carried within the 802.11 MAC header itself.
NEW QUESTION # 122
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