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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Medium Access | 10% | - Medium access performance analysis - Medium access related issues - CSMA/CA and medium access rules - Contention and coordination functions |
| Topic 2: 802.11 Frame Exchanges | 30% | - Data transfer and protection mechanisms - Association and authentication processes - Frame exchange troubleshooting - Frame exchange sequences |
| Topic 3: PHY Layers and Technologies | 10% | - 802.11 physical layer standards - Channelization and frequency usage - Modulation and coding schemes - PHY layer troubleshooting |
| Topic 4: MAC Sublayer and Functions | 25% | - MAC addressing and operations - MAC layer troubleshooting - QoS and power management - MAC frame formats and types |
| Topic 5: Spectrum Analysis | 10% | - RF spectrum fundamentals - Interference detection and classification - Spectrum analysis tools - Troubleshooting RF issues |
| Topic 6: Protocol Analysis | 15% | - Troubleshooting using protocol data - Capture and decode process - Protocol analysis fundamentals - Analysis tools and methods |
>> CWAP-405 Valid Exam Syllabus <<
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NEW QUESTION # 16
How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?
Answer: A
Explanation:
A VoIP phone, using WMM Power Save, requests data frames buffered at the AP by transmitting a trigger frame, which is a QoS Null frame or a QoS Data frame. WMM Power Save is a power saving mode that allows a STA (station) to conserve battery power by periodically sleeping and waking up. WMM Power Save is based on WMM (Wi-Fi Multimedia), which is a QoS (Quality of Service) enhancement that provides prioritized and differentiated access to the medium for different types of traffic. When a STA sleeps, it cannot receive any data frames from the AP, so it informs the AP of its power save status by setting a bit in its MAC header. The AP then buffers any data frames destined for the sleeping STA until it wakes up. When a STA wakes up, it sends a trigger frame to the AP, indicating its AC (Access Category), which is a logical queue that corresponds to its QoS level. A trigger frame can be either a QoS Null frame or a QoS Data frame, depending on whether it has any payload or not. The AP then responds with one or more data frames from the same AC as the trigger frame, followed by an ACK or BA (Block Acknowledgement) frame from the STA.
The other options are not correct, as they are not used by a VoIP phone using WMM Power Save to request data frames buffered at the AP. A PS-Poll (Power Save Poll) frame is used by a STA using legacy power save mode, not WMM Power Save mode, to request data frames buffered at the AP. A PS-Poll frame does not indicate any AC or QoS information. Setting the More Data bit in the MAC header to 1 does not request any data frames from the AP, but indicates that there are more data frames to be sent by the STA or received by the STA. Transmitting a WMM Action frame does not request any data frames from the AP, but performs various management actions related to WMM features, such as admission control, parameter update, etc. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page
198-199
NEW QUESTION # 17
Laptop-based wireless spectrum analyzers provide a visual representation of RF signals in which domain?
Answer: B
Explanation:
Laptop-based wireless spectrum analyzers display RF energy as a function of frequency, providing a visual representation in the frequency domain. This allows identification of interference sources and channel conditions.
NEW QUESTION # 18
Which one of the statements regarding the Frame Control field in an 802.11 MAC header is true?
Answer: C
Explanation:
The Frame Control field in the 802.11 MAC header is composed of multiple subfields, including several 1-bit flags such as To DS, From DS, More Fragments, Retry, Power Management, More Data, Protected Frame, and Order. These subfields define the type, subtype, and control characteristics of the frame.
NEW QUESTION # 19
As the WLAN engineer in your organization, you must troubleshoot performance problems related to co- channel interference (CCI).
What is a good measurement of CCI impact in addition to the number of APs seen on a channel?
Answer: B
NEW QUESTION # 20
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?
Answer: D
Explanation:
Observing the problem is the most important step in the WLAN troubleshooting methodology among those listed. This step involves capturing and analyzing the relevant data from the wireless network, such as packets, frames, spectrum, and performance metrics. Observing the problem helps to verify the existence and scope of the issue, identify the root cause and possible solutions, and validate the results of any actions taken. The other steps are also important, but they are not as critical as observing the problem12 References:
* CWAP-405Study Guide, Chapter 1: Troubleshooting Methodology, page 15
* CWAP-405Objectives, Section 1.2: Observe the problem
NEW QUESTION # 21
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