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NEW QUESTION # 79
What is the primary purpose of Orthogonal Frequency Division Multiple Access (OFDMA) as introduced in 802.11ax?
Answer: A
Explanation:
OFDMA is a key feature of 802.11ax (Wi-Fi 6) that divides an OFDM channel into smaller frequency subcarrier groups called Resource Units (RUs). This allows an access point to allocate different RUs to different client devices for simultaneous uplink or downlink transmission within the same channel and time period. OFDMA improves efficiency, particularly for applications with small, frequent data transmissions such as IoT devices and VoIP traffic, by reducing overhead and contention compared to traditional OFDM systems.
NEW QUESTION # 80
What statement about the beamwidth of an RF antenna is true?
Answer: D
Explanation:
The beamwidth of an RF antenna is the angular measure of how wide the main lobe of radiation is. The main lobe is the area where the signal strength is highest and most concentrated. The beamwidth is calculated at the points where the main lobe decreases power by 3 dB, which means it is half of the maximum power. The beamwidth can be measured in both horizontal and vertical planes, depending on how the antenna is oriented. The horizontal beamwidth is also called azimuth, while the vertical beamwidth is also called elevation. The beamwidth patterns on an antenna polar chart indicate how the RF energy is distributed in different directions.
NEW QUESTION # 81
You are performing a post-implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?
Answer: D
Explanation:
A Wi-Fi scanner is a basic tool that can be used to easily locate areas of high co-channel interference. A Wi-Fi scanner is a software application that can run on a laptop, tablet, smartphone, or other device that has a Wi-Fi adapter. A Wi-Fi scanner can scan the wireless environment and display information about the detected access points and client stations, such as their SSID, BSSID, channel, signal strength, security, and data rate. A Wi-Fi scanner can also show the channel utilization and overlap of different access points, which can indicate the level of co-channel interference. Co- channel interference is a type of interference that occurs when multiple access points use the same or adjacent channels within the same coverage area. Co- channel interference can reduce the throughput and performance of the WLAN, as the access points and client stations have to contend for the channel access and avoid collisions. To identify areas of high co-channel interference, a Wi-Fi scanner can be used to measure the signal strength and channel utilization of different access points and compare them with a threshold or a baseline. Alternatively, a Wi-Fi scanner can also use a color- coded heat map to visualize the co- channel interference level in different locations.
NEW QUESTION # 82
What frame type is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS?
Answer: D
Explanation:
The frame type that is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS is RTS. RTS stands for Request to Send and is a control frame that is sent by a station to request access to the medium for a specified duration. The RTS frame contains the source and destination MAC addresses, as well as a Network Allocation Vector (NAV) value that indicates how long the medium will be occupied. The destination station responds with a Clear to Send (CTS) frame that echoes the NAV value and grants permission to the source station. All other stations in the BSS hear either the RTS or CTS frame and update their NAV timers accordingly, deferring their transmissions until the medium is free. The RTS/CTS mechanism can be used to prevent hidden node problems, reduce collisions, and protect high data rate frames that use features such as 802.11n or 802.11ac that may not be compatible with legacy stations. ACK, Beacon, and PS-Poll are not used to reserve the medium for high data rate frames. References: [CWNP Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 112; [CWNA: Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 102.
NEW QUESTION # 83
What organization is responsible for testing and certifying interoperability between 802.11 devices from different manufacturers?
Answer: A
Explanation:
The Wi-Fi Alliance is a industry trade organization that certifies interoperability between 802.11 devices manufactured by different vendors, ensuring that certified products work together properly. While the IEEE develops and maintains the underlying 802.11 technical standards, the Wi-Fi Alliance created the recognizable "Wi-Fi" branding and certification programs, such as Wi- Fi CERTIFIED 6 and WPA3, to validate that products meet defined interoperability and security requirements.
NEW QUESTION # 84
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