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| Section | Objectives |
|---|---|
| WLAN Security and Management | - Security mechanisms and monitoring
|
| WLAN Infrastructure and Devices | - Access points and client devices
|
| 802.11 Protocol and MAC Layer | - Frame types and communication process
|
| WLAN Network Design | - Design principles and planning
|
| RF Technologies and Fundamentals | - Radio frequency principles and behavior
|
| WLAN Regulations and Standards | - Wireless standards and amendments
|
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NEW QUESTION # 53
What minimum signal level, typically expressed in negative dBm, represents the weakest signal that a receiver can successfully demodulate and decode at a specified data rate?
Answer: A
Explanation:
Receiver sensitivity is the minimum RF signal level, expressed in dBm as a negative value (such as -70 dBm), at which a receiver can successfully demodulate and decode a signal at a given data rate while maintaining an acceptable bit error rate. Receiver sensitivity varies by data rate; higher data rates using more complex modulation schemes require a stronger received signal than lower data rates. This is why devices closer to an AP can achieve higher data rates than devices farther away, as the received signal degrades with distance.
NEW QUESTION # 54
What cipher suite is specified by the 802.11-2016 standard and is not deprecated?
Answer: C
Explanation:
The cipher suite specified by the 802.11-2016 standard and is not deprecated is Counter Mode with CBC-MAC Protocol (CCMP). CCMP is an encryption protocol that uses Advanced Encryption Standard (AES) as the underlying cipher and provides confidentiality, integrity, and origin authentication for wireless data. CCMP is the mandatory encryption protocol for WPA2 and WPA3. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 295; [IEEE Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications], page 1560.
NEW QUESTION # 55
What statement about the beamwidth of an RF antenna is true?
Answer: C
Explanation:
The beamwidth of an RF antenna is the angular measure of how wide the main lobe of radiation is. The main lobe is the area where the signal strength is highest and most concentrated. The beamwidth is calculated at the points where the main lobe decreases power by 3 dB, which means it is half of the maximum power. The beamwidth can be measured in both horizontal and vertical planes, depending on how the antenna is oriented. The horizontal beamwidth is also called azimuth, while the vertical beamwidth is also called elevation. The beamwidth patterns on an antenna polar chart indicate how the RF energy is distributed in different directions.
NEW QUESTION # 56
Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?
Answer: C
Explanation:
Patch and panel antennas are directional antenna types that are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation. These antennas have a flat rectangular shape and can be mounted on walls or ceilings to provide coverage in a specific direction. They have a moderate gain and a relatively wide beamwidth, making them suitable for multipath environments where signals can reflect off different surfaces and create multiple spatial streams. Patch and panel antennas can also support polarization diversity, which means they can transmit and receive both horizontally and vertically polarized waves, increasing the MIMO performance. References: 1, Chapter 2, page 72; 2, Section 2.4
NEW QUESTION # 57
What cipher suite is specified by the 802.11-2016 standard and is not deprecated?
Answer: C
Explanation:
The cipher suite specified by the 802.11-2016 standard and is not deprecated is Counter Mode with CBC- MAC Protocol (CCMP). CCMP is an encryption protocol that uses Advanced Encryption Standard (AES) as the underlying cipher and provides confidentiality, integrity, and origin authentication for wireless data.
CCMP is the mandatory encryption protocol for WPA2 and WPA3. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 295; [IEEE Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications], page 1560.
NEW QUESTION # 58
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