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| Section | Weight | Objectives |
|---|---|---|
| MAC Sublayer and Functions | 25% | - MAC frame formats and types - MAC addressing and operations - QoS and power management - MAC layer troubleshooting |
| 802.11 Frame Exchanges | 30% | - Association and authentication processes - Data transfer and protection mechanisms - Frame exchange troubleshooting - Frame exchange sequences |
| Protocol Analysis | 15% | - Analysis tools and methods - Protocol analysis fundamentals - Capture and decode process - Troubleshooting using protocol data |
| PHY Layers and Technologies | 10% | - Channelization and frequency usage - 802.11 physical layer standards - Modulation and coding schemes - PHY layer troubleshooting |
| Spectrum Analysis | 10% | - Troubleshooting RF issues - Spectrum analysis tools - Interference detection and classification - RF spectrum fundamentals |
| WLAN Medium Access | 10% | - Contention and coordination functions - Medium access performance analysis - Medium access related issues - CSMA/CA and medium access rules |
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NEW QUESTION # 48
After examining a Beacon frame decode you see the SSID Element has a length of 0. What do you conclude about this frame?
Answer: B
Explanation:
An SSID element with a length of 0 in a Beacon frame indicates that the SSID is intentionally not being broadcast. This is characteristic of a BSS configured for a hidden SSID, where the SSID field is present but contains no characters.
NEW QUESTION # 49
What is the typical duty cycle of a microwave oven?
Answer: B
Explanation:
A microwave oven typically has a duty cycle of about 50% (0.5) when operating, meaning it emits RF energy approximately half of the time, which can significantly interfere with WLAN signals in the 2.4 GHz band.
NEW QUESTION # 50
Prior to a retransmission what happens to the CWmax value?
Answer: D
Explanation:
Before a retransmission, the contention window is increased using the binary exponential backoff algorithm. The window size doubles and increases by one, up to the defined maximum limit, which reduces the probability of repeated collisions during subsequent transmission attempts.
NEW QUESTION # 51
ABC International has installed a new smart ZigBee controlled lighting system. However, the network team is concerned that this new system will interfere with the existing WLAN and has asked you to investigate the impact of the two systems operating simultaneously in the 2.4 GHz band. When performing Spectrum Analysis, which question could you answer by looking at the FFT plot?
Answer: B
Explanation:
The FFT plot is a spectrum analysis plot that shows the RF power present at a particular frequency over a short period of time. It can help identify the sources and characteristics of RF signals in the spectrum. By looking at the FFT plot, you can determine which ZigBee channels are used by the lighting system and whether they overlap with the WLAN channels in the 2.4 GHz band. ZigBee channels are 5 MHz wide and WLAN channels are 20 MHz or 40 MHz wide, so there is a possibility of overlap and interference between them. The other questions cannot be answered by looking at the FFT plot alone, as they require other types of plots or analysis tools, such as duty cycle plot, airtime utilization plot, or protocol analyzer. References: [Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 69-
70
NEW QUESTION # 52
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: D
Explanation:
A high volume of Deauthentication frames sent to the broadcast destination address forces all nearby clients to disconnect and prevents new associations, which is a classic denial-of-service condition at the 802.11 management layer. Because the source addresses are spoofed to match the AP BSSIDs and the impact is localized to one floor, this strongly points to an external device/system transmitting forged deauthentication traffic in that area, commonly caused by a misconfigured wireless intrusion prevention system or similar containment feature operated by another tenant.
NEW QUESTION # 53
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