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NEW QUESTION # 52
What is the primary purpose of Orthogonal Frequency Division Multiple Access (OFDMA) as introduced in 802.11ax?
Answer: C
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 # 53
You are tasked with performing a throughput test on the WLAN. The manager asks that you use open source tools to reduce costs. What open source tool is designed to perform a throughput test?
Answer: D
Explanation:
iPerf is an open source tool that is designed to perform a throughput test on the WLAN. iPerf is a cross-platform command-line tool that can measure the bandwidth and quality of network links by generating TCP or UDP traffic between two endpoints.iPerf can run as either a server or a client mode, depending on whether it receives or sends traffic. iPerf can also report various metrics of network performance, such as throughput, jitter, packet loss, delay, and TCP window size. To perform a throughput test on the WLAN using iPerf, one device needs to run iPerf in server mode and another device needs to run iPerf in client mode. The devices need to be connected to the same WLAN network and have their IP addresses configured properly.
The device running iPerf in client mode needs to specify the IP address of the device running iPerf in server mode as well as other parameters such as protocol, port number, duration, interval, bandwidth limit, packet size, etc. The device running iPerf in server mode will listen for incoming connections from the client device and send back acknowledgments or responses depending on the protocol used. The device running iPerf in client mode will send traffic to the server device according to the specified parameters and measure the network performance. The device running iPerf in client mode will display the results of the throughput test at the end of the test or at regular intervals during the test. The results can show the average, minimum, maximum, and instantaneous throughput of the network link, as well as other metrics such as jitter, packet loss, delay, and TCP window size. References: 1, Chapter 7, page 287; 2, Section 4.3
NEW QUESTION # 54
You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you document your findings, what term do you use to describe the problem in this configuration?
Answer: C
NEW QUESTION # 55
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: A
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: Exam CWNA-109], page 112; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 102.
NEW QUESTION # 56
A network administrator wants to reduce co-channel interference in a high-density 2.4 GHz deployment. What is the recommended best practice for channel planning in this band?
Answer: A
Explanation:
In the 2.4 GHz band, only three channels, 1, 6, and 11, are non-overlapping when using standard
20 MHz channel widths in regions like the United States. Using any other channels, or overlapping adjacent channels, results in adjacent channel interference, which degrades performance for all nearby devices. Best practice for 2.4 GHz deployments is to design the channel reuse pattern using only channels 1, 6, and 11, and to avoid 40 MHz channel bonding in this band due to the limited number of available channels.
NEW QUESTION # 57
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