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| Section | Objectives |
|---|---|
| Topic 1: RF Technologies and Fundamentals | - Radio frequency principles and behavior
|
| Topic 2: WLAN Network Design | - Design principles and planning
|
| Topic 3: WLAN Regulations and Standards | - Wireless standards and amendments
|
| Topic 4: 802.11 Protocol and MAC Layer | - Frame types and communication process
|
| Topic 5: WLAN Infrastructure and Devices | - Access points and client devices
|
| Topic 6: WLAN Security and Management | - Security mechanisms and monitoring
|
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NEW QUESTION # 154
You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?
Answer: A
Explanation:
https://7signal.com/802-11ac-migration-part-2-whats-nobodys-telling-you-about-80mhz-and-160mhz-channel- bonding The clients are all 802.11n STAs or lower is the likely cause of this behavior. If a WLAN with 100 802.11ac access points is configured to use 80 MHz channels, but only 40 MHz communications are seen in a particular BSS, it means that the clients in that BSS do not support 80 MHz channels. This could be because they are using older standards, such as 802.11n or lower, that do not support 80 MHz channels. Alternatively, they could be using newer standards, such as 802.11ac or ax, but have their channel width settings limited to 40 MHz or lower due to device capabilities or configuration options. In either case, the AP will adapt to the client's channel width and use only 40 MHz of the 80 MHz allocated bandwidth to communicate with them.
This will reduce the potential throughput and efficiency of the WLAN. References: , Chapter 3, page 111; , Section 3.2
NEW QUESTION # 155
A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following methods is commonly used to locate the controllers by the APs?
Answer: D
Explanation:
DHCP (Dynamic Host Configuration Protocol) is a commonly used method to locate the controllers by the APs in a WLAN that is implemented using wireless controllers. DHCP is a protocol that allows a device to obtain an IP address and other network configuration parameters from a server. In a wireless controller scenario, the APs can use DHCP to request an IP address from a DHCP server, which can also provide the IP address or hostname of the wireless controller as an option in the DHCP response. This way, the APs can discover the wireless controller and establish a connection with it. Alternatively, the APs can also use other methods to locate the wireless controller, such as DNS (Domain Name System), broadcast or multicast discovery, or manual configuration.
NEW QUESTION # 156
You are using a tool that allows you to see signal strength for all Aps in the area with a visual representation.
It shows you SSIDs available and the security settings for each SSID. It allows you to filter by frequency band to see only 2.4 GHz networks or only 5 GHz networks. No additional features are available.
What kind of application is described?
Answer: C
Explanation:
The tool described is a WLAN (Wireless Local Area Network) scanner tool. WLAN scanner tools are designed to provide information about the wireless networks in a given area, including:
* Signal Strength: They show the signal strength of all access points (APs) in the vicinity, which is crucial for understanding the coverage area and potential interference.
* SSID Visualization: These tools display the SSIDs (Service Set Identifiers) of available networks, allowing users to identify different wireless networks easily.
* Security Settings Information: WLAN scanner tools often show the type of security implemented on each network, such as WPA2, WEP, etc.
* Frequency Band Filtering: They allow users to filter and view networks based on the frequency band (2.4 GHz or 5 GHz), which is useful for analyzing network distribution and planning.
While protocol analyzers, site survey utilities, and spectrum analyzers are also used in wireless networking, their functions are distinct from what is described:
* Protocol Analyzers are more sophisticated and are used to capture and analyze network traffic.
* Site Survey Utilities are used to map signal coverage and plan network layouts, often with more advanced features for detailed site surveys.
* Spectrum Analyzers provide a detailed view of the frequency spectrum and non-Wi-Fi interference but don't typically focus on SSIDs or security settings.
Thus, the correct answer is D, a WLAN scanner tool, based on the functionalities described.
References:
CWNA Certified Wireless Network Administrator Official Study Guide: Exam PW0-105, by David D.
Coleman and David A. Westcott.
Tools and techniques for wireless network analysis and troubleshooting.
NEW QUESTION # 157
Which semi-directional antenna type is commonly used for point-to-point bridge links and features multiple elements along a straight boom to focus RF energy in a narrow beamwidth?
Answer: A
Explanation:
A Yagi antenna is a semi-directional antenna consisting of multiple elements, including a driven element, a reflector, and one or more directors, arranged along a boom. This design focuses RF energy into a narrower beamwidth compared to omnidirectional antennas, resulting in higher gain in a specific direction. Yagi antennas are commonly used for point-to-point outdoor bridge links and other applications requiring focused coverage over a moderate distance.
NEW QUESTION # 158
802.11ax (HE) introduces Resource Units that can be used to allow communications with multiple devices at the same time, on the same channel, in the same BSS. What feature of 802.1 lax provides this functionality?
Answer: A
Explanation:
The feature of 802.11ax (HE) that provides this functionality is OFDM A . OFDMA stands for Orthogonal Frequency Division Multiple Access and is a technology that allows multiple devices to communicate simultaneously on the same channel in the same BSS. OFDMA works by dividing a channel into smaller subchannels called Resource Units (RUs), which are composed of groups of subcarriers or tones. Each RU can be assigned to a different device based on its bandwidth requirement and signal quality. This way, OFDMA can increase the efficiency and capacity of the channel by reducing overhead, contention, and latency. OFDMA can also support both uplink and downlink multi-user transmissions using trigger frames and buffer status reports.
6 GHz support, TWT, and Wi-Fi-LTE are not features of 802.11ax that provide this functionality.
NEW QUESTION # 159
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