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| Section | Weight | Objectives |
|---|---|---|
| 802.11 Frame Exchanges | 30% | - Frame exchange troubleshooting - Data transfer and protection mechanisms - Frame exchange sequences - Association and authentication processes |
| Protocol Analysis | 15% | - Capture and decode process - Protocol analysis fundamentals - Troubleshooting using protocol data - Analysis tools and methods |
| WLAN Medium Access | 10% | - Medium access performance analysis - CSMA/CA and medium access rules - Medium access related issues - Contention and coordination functions |
| MAC Sublayer and Functions | 25% | - MAC frame formats and types - MAC layer troubleshooting - QoS and power management - MAC addressing and operations |
| PHY Layers and Technologies | 10% | - 802.11 physical layer standards - Channelization and frequency usage - Modulation and coding schemes - PHY layer troubleshooting |
| Spectrum Analysis | 10% | - Spectrum analysis tools - Troubleshooting RF issues - RF spectrum fundamentals - Interference detection and classification |
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NEW QUESTION # 29
Several users have reported WLAN network connection issues and the users connect to the same AP. These users are spread throughout a 320 square meter area. Using a spectrum analyzer, you see RF energy across the entire 2.4 GHz band at significant signal strength levels. The users all connect using either HT or ERP devices.
What is the likely cause of this problem within this area?
Answer: B
NEW QUESTION # 30
A client is operating in an unstable RF environment. Out of five data frames transmitted to the client it only receives four. The client sends a Block Ack to acknowledge the receipt of these four frames but due to frame corruption the Block Ack is not received by the AP. Which frames will be retransmitted?
Answer: A
Explanation:
If the AP does not receive the Block Ack, it has no confirmation of which MPDUs were successfully received within the block. Without that acknowledgment, the transmitter must assume delivery failure for the outstanding frames and retransmit the entire burst to ensure reliable delivery.
NEW QUESTION # 31
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 # 32
The Retry subfield is found in which IEEE 802.11 frame field?
Answer: C
NEW QUESTION # 33
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: A
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 # 34
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