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NEW QUESTION # 128
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?
Answer: C
Explanation:
VHT TXOP (Very High Throughput Transmit Opportunity) power save is a feature introduced with the
802.11ac amendment, which is designed to improve the power efficiency of devices connected to a WLAN.
This feature enhances battery life in several ways, compared to the legacy Power Save mode:
* Enhanced Power Saving: VHT TXOP power save allows devices to disable more components of the WLAN transceiver when they are in a low power state. This reduces the power consumption during periods when the device is not actively transmitting or receiving data.
* Intelligent Wake-Up Mechanisms: It employs more sophisticated mechanisms for devices to determine when they need to wake up and listen to the channel, further reducing unnecessary power usage.
* Optimized Operation: This power save mode is optimized for the high-throughput environment of
802.11ac networks, allowing devices to efficiently manage power while maintaining high performance.
Legacy Power Save mode, introduced in earlier versions of the 802.11 standards, does not provide the same level of component disablement or the intelligent wake-up mechanisms found in VHT TXOP power save, making option B the correct answer.
References:
* IEEE 802.11ac-2013 Amendment: Enhancements for Very High Throughput for Operation in Bands below 6 GHz.
* CWNA Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109, by David D: Coleman and David A. Westcott.
NEW QUESTION # 129
What term describes the physical coverage area of a single access point, within which a client station can successfully communicate with that specific AP?
Answer: C
Explanation:
The Basic Service Area (BSA) refers to the physical RF coverage area of a single access point, meaning the geographic region within which client stations can successfully associate and communicate with that AP. This differs from the Basic Service Set (BSS), which refers to the logical grouping of the AP and its associated stations, rather than the physical coverage area itself. Multiple overlapping BSAs, each belonging to a different AP, together make up the coverage area of an Extended Service Set.
NEW QUESTION # 130
You are troubleshooting a problem with a new 802.11ax AP. While the AP supports four spatial streams, most clients are only achieving maximum data rates of 150 Mbps. What is the likely cause?
Answer: B
Explanation:
The scenario described suggests that while the Access Point (AP) is capable of 802.11ax (Wi-Fi
6) with four spatial streams, the clients are only achieving data rates typical of 802.11n (Wi-Fi 4) devices, which indicates that the clients are likely 802.11n devices. Here's why this is the most plausible explanation:
802.11n Limitations: Devices that adhere to the 802.11n standard have lower maximum data rates compared to 802.11ax devices due to differences in technology such as modulation, spatial streams, and channel bandwidth. An 802.11n device with a single spatial stream operating on a
20 MHz channel can achieve a maximum data rate of 72.2 Mbps. Even with two spatial streams under ideal conditions, this would only double to approximately 144.4 Mbps, which is close to the
150 Mbps mentioned.
Spatial Stream Capability: The fact that the AP supports four spatial streams suggests it can achieve much higher data rates with 802.11ax clients that also support multiple spatial streams.
However, if the clients are 802.11n devices, they may not be capable of using more than two spatial streams, and many earlier 802.11n devices were limited to just one.
NEW QUESTION # 131
What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?
Answer: B
Explanation:
Shared Key Authentication is a security solution that was defined in the original 802.11 standard as an alternative to Open System Authentication, which does not provide any security at all. Shared Key Authentication uses WEP (Wired Equivalent Privacy) to encrypt and authenticate data frames between the client station and the AP. However, WEP has been proven to be extremely vulnerable to various attacks that can easily crack the encryption key and compromise the network security. Therefore, Shared Key Authentication is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment . References: [CWNA-109 Study Guide], Chapter 10: Wireless LAN Security, page 401;
[CWNA-109Study Guide], Chapter 10: Wireless LAN Security, page 391; [Wikipedia], Wired Equivalent Privacy.
NEW QUESTION # 132
What technology allows an access point to use multiple antennas to transmit and receive multiple spatial streams simultaneously, increasing throughput and reliability by taking advantage of multipath?
Answer: D
Explanation:
Multiple-Input Multiple-Output (MIMO) technology uses multiple antennas at both the transmitter and receiver to send and receive multiple spatial streams of data simultaneously over the same channel. MIMO takes advantage of multipath propagation rather than being hindered by it, using techniques such as spatial multiplexing to increase throughput, and Maximal Ratio Combining along with Transmit Beamforming to improve reliability. MIMO was introduced with 802.11n and remains a core component of 802.11ac and 802.11ax.
NEW QUESTION # 133
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