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| Section | Objectives |
|---|---|
| Topic 1: 802.11 Protocol and MAC Layer | - Frame types and communication process
|
| Topic 2: WLAN Security and Management | - Security mechanisms and monitoring
|
| Topic 3: RF Technologies and Fundamentals | - Radio frequency principles and behavior
|
| Topic 4: WLAN Infrastructure and Devices | - Access points and client devices
|
| Topic 5: WLAN Network Design | - Design principles and planning
|
| Topic 6: WLAN Regulations and Standards | - Wireless standards and amendments
|
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NEW QUESTION # 96
What field within a Beacon frame is used to inform sleeping stations that the AP has buffered broadcast or multicast traffic to be delivered?
Answer: B
Explanation:
The Traffic Indication Map (TIM) is a field included in every Beacon frame that indicates which associated stations, identified by their Association ID, have buffered unicast frames waiting at the AP. A special variant, the Delivery Traffic Indication Map (DTIM), is sent at a configured interval and informs stations that buffered broadcast or multicast traffic will be delivered following that particular beacon. Stations in power save mode wake periodically to check the TIM/DTIM and determine whether they need to retrieve buffered data.
NEW QUESTION # 97
You are deploying a WLAN monitoring solution that utilizes distributed sensor devices. Where should sensors be deployed for best results? Choose the single best answer.
Answer: D
Explanation:
Sensors should be deployed in critical areas where WLAN performance must be high for best results when using a WLAN monitoring solution that utilizes distributed sensor devices. A WLAN monitoring solution is a system that collects, analyzes, and reports on the status and performance of a WLAN. A WLAN monitoring solution can use different methods to gather data from the WLAN, such as embedded software agents, external hardware probes, or distributed sensor devices. Distributed sensor devices are dedicated devices that are deployed throughout the WLAN coverage area to monitor the wireless traffic and environment. Distributed sensor devices can perform various functions, such as scanning the spectrum, capturing wireless frames, measuring signal quality, detecting rogue access points, testing connectivity, and generating alerts. Distributed sensor devices can provide more accurate and comprehensive data than other methods, but they also require more planning and deployment costs. Therefore, it is important to deploy sensors strategically in critical areas where WLAN performance must be high, such as high-density zones, high-priority applications, or high-security locations. By deploying sensors in critical areas, the WLAN monitoring solution can ensure optimal WLAN performance and reliability in those areas and identify and resolve any issues or problems that may arise. The other options are not the best places to deploy sensors for best results. Deploying sensors in switching closets is not effective because sensors need to be close to the wireless medium to monitor it properly. Deploying sensors every 5 meters and alongside each AP is not efficient because sensors may overlap or interfere with each other and cause unnecessary redundancy or complexity. Deploying sensors above the plenum oneach floor is not practical because sensors may not capture the wireless traffic and environment accurately due to attenuation or reflection from the ceiling materials or objects. References: CWNA-109 Study Guide, Chapter 14: Troubleshooting Wireless LANs, page 4831
NEW QUESTION # 98
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. References: 1, Chapter 7, page
279; 2, Section 4.3
NEW QUESTION # 99
What 802.11 amendment provides Radio Resource Management (RRM) capabilities, allowing client stations to request neighbor reports from an AP to assist with roaming decisions?
Answer: B
Explanation:
802.11k, also known as Radio Resource Management, allows client stations to request a neighbor report from their currently associated AP, which contains information about nearby APs, including channel and signal information. This helps the client make faster and more informed roaming decisions without needing to perform a full scan of all available channels. 802.11k is often deployed alongside 802.11r for fast, efficient roaming, and 802.11v for network-assisted client steering.
NEW QUESTION # 100
What condition occurs when a client station cannot detect another client station because it is out of range, but both stations can communicate with the same access point, resulting in potential frame collisions at the AP?
Answer: B
Explanation:
The hidden node problem occurs when two client stations are both within range of the same access point but are out of range of each other. Because each client cannot detect the other's transmissions using Clear Channel Assessment, they may transmit simultaneously, resulting in a collision at the access point. This problem is often mitigated using RTS/CTS (Request to Send/Clear to Send) protection, which reserves the medium before transmission to help prevent hidden node collisions.
NEW QUESTION # 101
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