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| Section | Weight | Objectives |
|---|---|---|
| WLAN Medium Access | 10% | - Contention and coordination functions - Medium access related issues - CSMA/CA and medium access rules - Medium access performance analysis |
| 802.11 Frame Exchanges | 30% | - Association and authentication processes - Data transfer and protection mechanisms - Frame exchange sequences - Frame exchange troubleshooting |
| Spectrum Analysis | 10% | - Troubleshooting RF issues - Spectrum analysis tools - Interference detection and classification - RF spectrum fundamentals |
| MAC Sublayer and Functions | 25% | - MAC layer troubleshooting - QoS and power management - MAC addressing and operations - MAC frame formats and types |
| Protocol Analysis | 15% | - Capture and decode process - Analysis tools and methods - Protocol analysis fundamentals - Troubleshooting using protocol data |
| PHY Layers and Technologies | 10% | - Modulation and coding schemes - Channelization and frequency usage - 802.11 physical layer standards - PHY layer troubleshooting |
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NEW QUESTION # 78
You are concerned with management overhead in your WLAN. When evaluating the network, you note that each dual-band AP provides for 4 SSIDs in each band with three secure SSIDs and one Open System SSID.
The network runs only 802.11ac APs and uses 20 MHz channels in 2.4 GHz and 400 MHz channels in 5 GHz.
What can you do to reduce the impact of beacon frames on CCI and channel utilization?
Answer: B
NEW QUESTION # 79
The data rate for a data frame is 150 Mbps in 5 GHz.
What rate is used to transmit the PHY header information?
Answer: A
Explanation:
References:
NEW QUESTION # 80
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: A
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 # 81
How is the length of an AIFS calculated?
Answer: D
Explanation:
The length of an AIFS (Arbitration Interframe Space) is calculated by multiplying the AIFSN (Arbitration Interframe Space Number) by the Slot Time and adding the SIFS (Short Interframe Space). An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. Each AC has a different AIFSN value, which determines how long it has to wait before attempting to access the medium. A lower AIFSN value means a higher priority and a shorter waiting time.
The Slot Time is a fixed value that depends on the PHY type and channel width. The SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs or CTSs. The formula for calculating the AIFS length is: AIFS = AIFSN * Slot Time + SIFS. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page 194-195
NEW QUESTION # 82
You're the WLAN administrator for a large retailer based at the HQ in New York. The London- based office has been complaining about WLAN disconnections around lunch time each day. You suspect this might be interference from the staff microwave, how might you test your theory from the New York office?
Answer: D
Explanation:
Placing an AP into spectrum analyzer mode allows remote monitoring of RF energy in the 2.4 GHz band during the suspected time of interference. Microwave ovens emit broadband RF interference that is clearly visible in spectrum analysis. By observing the RF activity over lunch time, you can correlate interference patterns with the reported WLAN disconnections without needing to be physically present.
NEW QUESTION # 83
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