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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Medium Access | 10% | - Medium access related issues - CSMA/CA and medium access rules - Medium access performance analysis - Contention and coordination functions |
| Topic 2: 802.11 Frame Exchanges | 30% | - Data transfer and protection mechanisms - Frame exchange sequences - Frame exchange troubleshooting - Association and authentication processes |
| Topic 3: MAC Sublayer and Functions | 25% | - MAC layer troubleshooting - MAC frame formats and types - QoS and power management - MAC addressing and operations |
| Topic 4: Spectrum Analysis | 10% | - Interference detection and classification - Troubleshooting RF issues - RF spectrum fundamentals - Spectrum analysis tools |
| Topic 5: PHY Layers and Technologies | 10% | - Channelization and frequency usage - 802.11 physical layer standards - Modulation and coding schemes - PHY layer troubleshooting |
| Topic 6: Protocol Analysis | 15% | - Protocol analysis fundamentals - Capture and decode process - Troubleshooting using protocol data - Analysis tools and methods |
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質問 # 10
A manufacturing facility has installed a new automation system which incorporates an 802.11 wireless network. The automation system is controlled from tablet computers connected via the WLAN. However, the automation system has not gone live due to problem with the tablets connecting to the WLAN. The WLAN vendor has been onsite to perform a survey and confirmed good primary and secondary coverage across the facility. As a CWAP you are called in to perform Spectrum Analysis to identify any interference sources.
From the spectrum analysis, you did not identify any interference sources but were able to correctly identify the issue. Which of the following issues did you identify from the spectrum analysis?
正解：D
解説：
The most likely issue that can be identified from the spectrum analysis is a power mismatch between the APs and the clients. A power mismatch occurs when the APs transmit at a higher power level than the clients, or vice versa. This can cause asymmetric communication, where one side can hear the other, but not vice versa.
This can result in poor performance, disconnections, or packet loss. A spectrum analysis can reveal a power mismatch by showing different signal amplitudes or RSSI values for the APs and the clients on the same channel or frequency. The other options are not correct, as they cannot be identified from the spectrum analysis alone. The tablets' SSID, power save mode, and noise floor can be determined by using other tools or methods, such as protocol analysis, site survey, or device configuration. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 3: Spectrum Analysis, page 79-80
質問 # 11
Many access points support IEEE 802.1Q VLAN tagging. When analyzing a WLAN system using IEEE 802.1Q tags, where can the VLAN tag number be seen?
正解：C
質問 # 12
How many address fields does an ACK frame contain?
正解：A
解説：
An ACK frame is a control frame used to acknowledge receipt of a data or management frame. It contains only a single address field, the Receiver Address (RA), which identifies the station being acknowledged.
質問 # 13
What is an AIFS?
正解：A
解説：
An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An interframe space is a period of time that a STA (station) has to wait before attempting to access the medium. An AIFS is a type of interframe space that varies depending on the AC of the traffic. An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. There are four ACs defined by 802.11e: AC_VO (Voice), AC_VI (Video), AC_BE (Best Effort), and AC_BK (Background). Each AC has a different AIFSN (Arbitration Interframe Space Number) 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 other options are not correct, as they do not describe what an AIFS is. An AIFS is not a medium access method introduced by 802.11n, but never implemented, as it is part of the 802.11e standard and widely used in QoS-enabled WLANs. An AIFS is not a form of aggregation performed at the PHY layer based on 802.11e UP values interpreted from DSCP values, as aggregation is a technique that combines multiple frames into one larger frame to improve efficiency and throughput, not prioritization or medium access. An AIFS is not the shortest period of time a STA can sleep, as sleeping is a power saving mode that allows a STA to conserve battery power by periodically turning off its radio, not accessing the medium. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7:
QoS Analysis, page 194-195
質問 # 14
The To DS bit is set to 0 and the From DS is set to 1.
What best describes this 802.11 frame?
正解：B
質問 # 15
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