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NEW QUESTION # 31
Which 802.11 frame type is used by a station to request permission from an AP to leave power save mode and retrieve buffered frames?
Answer: D
Explanation:
A PS-Poll (Power Save Poll) frame is a control frame sent by a client station operating in legacy power save mode to request that the AP deliver any buffered unicast frames that arrived while the station was asleep. The AP announces buffered frames for sleeping stations using the Traffic Indication Map (TIM) field within its Beacon frames. Newer power management mechanisms, such as U-APSD and TWT, provide more efficient alternatives to the legacy PS-Poll mechanism.
NEW QUESTION # 32
You are installing an AP to be used by 27 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?
Answer: B
Explanation:
A 5 GHz channel should be used for this AP because channels 1 and 6 are 2.4 GHz channels and they have no impact on the decision. The 5 GHz frequency band offers more non-overlapping channels than the 2.4 GHz frequency band, which reduces interference and improves performance. The 5 GHz frequency band also supports higher data rates and wider channel bandwidths than the 2.4 GHz frequency band, which increases capacity and throughput. The 5 GHz frequency band also has less interference from other devices and sources than the 2.4 GHz frequency band, which enhances reliability and quality of service. Therefore, it is recommended to use the 5 GHz frequency band for WLANs whenever possible. Channels 1 and 6 are two of the three non-overlapping channels in the 2.4 GHz frequency band (the other one is channel 11). They are used by a neighbor network in this scenario, but they do not affect the channel selection for this AP because they operate in a different frequency band than the 5 GHz frequency band. Channel 6 is not always best to use; it depends on the interference and congestion level in the environment. Channel 1 is not best to use because it has a lower frequency than channel 6; frequency does not determine channel quality or performance. Channel 11 is not best to use because it is also a 2.4 GHz channel and it may interfere with channels 1 and 6. References: CWNA-109 Study Guide, Chapter 4: Antenna Systems and Radio Frequency (RF) Components, page 113
NEW QUESTION # 33
What 802.11 amendment introduces Wireless Network Management (WNM) capabilities, including BSS Transition Management, which allows an AP to suggest that a client roam to a different AP?
Answer: A
Explanation:
802.11v, known as Wireless Network Management, introduces several capabilities, including BSS Transition Management. This feature allows an AP or WLAN controller to send a request to a client device suggesting that it roam to a different, more suitable AP, such as one with a stronger signal or lower channel utilization. While the client is not obligated to comply, many modern devices support this feature, which helps improve load balancing and overall network performance, a technique commonly referred to as client steering.
NEW QUESTION # 34
You are performing a post-implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?
Answer: C
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. References: 1, Chapter 7, page
279; 2, Section 4.3
NEW QUESTION # 35
What is the primary function of the Clear Channel Assessment (CCA) process in the CSMA/CA medium access method?
Answer: A
Explanation:
Clear Channel Assessment (CCA) is a physical layer function used in the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) medium access method. Before a station transmits, it performs CCA to determine whether the RF medium is currently busy (another device is transmitting) or idle. CCA typically involves both physical carrier sense (energy detection and preamble detection) and virtual carrier sense using the Network Allocation Vector (NAV). If the medium is determined to be busy, the station defers transmission and enters a random backoff period.
NEW QUESTION # 36
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