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| Section | Weight | Objectives |
|---|---|---|
| Radio Frequency (RF) Technologies | 15% | - RF Fundamentals
|
| IEEE 802.11 Network Operations | 15% | - Performance Optimization
|
| IEEE 802.11 Regulations and Standards | 15% | - IEEE 802.11 Standards
|
| IEEE 802.11 Network Security | 15% | - Security Basics
|
| IEEE 802.11 Protocols and Devices | 20% | - WLAN Architecture
|
| IEEE 802.11 Network Implementation | 20% | - Deployment Models
|
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NEW QUESTION # 165
What is the maximum channel bandwidth supported by the 802.11ac amendment operating in the
5 GHz band?
Answer: A
Explanation:
The 802.11ac amendment supports channel bonding up to 160 MHz in the 5 GHz band, in addition to 20 MHz, 40 MHz, and 80 MHz channel widths. While 160 MHz channels can significantly increase theoretical throughput, they also consume a large portion of the available 5 GHz spectrum and can be difficult to implement in real-world deployments due to limited channel availability and increased susceptibility to interference. 320 MHz channel widths were later introduced with 802.11be (Wi-Fi 7) in the 6 GHz band.
NEW QUESTION # 166
What is the most effective method for testing roaming in relation to 802.11 VoIP handsets?
Answer: D
Explanation:
The most effective method for testing roaming in relation to 802.11 VoIP handsets is to place a call with the handset and move around the facility to test quality duringroaming. This method allows you to evaluate the actual performance and user experience of VoIP calls over wireless networks, as well as identify any potential issues such as signal strength, interference, latency, jitter, packet loss, or handoff delays. A spectrum analyzer can only show you the RF activity during a VoIP call, but not how it affects the voice quality or roaming behavior. A protocol analyzer can capture the traffic generated when a laptop roams, but it cannot simulate the characteristics of a VoIP handset such as battery life, antenna design, codec support, or QoS features. A built-in roaming monitor is not a common feature in all VoIP handsets, and it may not provide accurate or comprehensive information about the roaming process. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 487; [Voice over Wireless LAN 4.1 Design Guide], page 6-19.
NEW QUESTION # 167
What is the primary purpose of Orthogonal Frequency Division Multiple Access (OFDMA) as introduced in 802.11ax?
Answer: C
Explanation:
OFDMA is a key feature of 802.11ax (Wi-Fi 6) that divides an OFDM channel into smaller frequency subcarrier groups called Resource Units (RUs). This allows an access point to allocate different RUs to different client devices for simultaneous uplink or downlink transmission within the same channel and time period. OFDMA improves efficiency, particularly for applications with small, frequent data transmissions such as IoT devices and VoIP traffic, by reducing overhead and contention compared to traditional OFDM systems.
NEW QUESTION # 168
What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?
Answer: B
Explanation:
What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers) is a Fresnel Zone that is at least 60% clear of obstructions. The Fresnel Zone is an elliptical-shaped area around the line-of-sight path between two antennas that reflects and refracts the RF waves. The Fresnel Zone radius depends on the frequency of the RF signal and the distance between the antennas. For optimal performance, the Fresnel Zone should be at least
60% clear of any obstructions that may cause interference, attenuation, or multipath fading. The minimum output power level, antenna gain, and antenna type may vary depending on the environmental conditions and regulatory constraints, but they are not always required for a high quality RF link.
NEW QUESTION # 169
What factor does not influence the distance at which an RF signal can be effectively received?
Answer: A
Explanation:
In wireless communication, several factors influence the effective reception of RF signals, including the receiving station's radio sensitivity, the transmitting station's output power, and free space path loss. However, the receiving station's output power does not influence the distance at which an RF signal can be effectively received. The key factors that impact signal reception distance are:
* Receiving Station's Radio Sensitivity: This refers to the lowest signal strength at which the receiver can process a signal with an acceptableerror rate. Higher sensitivity allows for better reception at greater distances.
* Transmitting Station's Output Power: This is the power with which a transmitter sends out a signal.
Higher output power can extend the range of transmission, making it easier for distant receivers to detect the signal.
* Free Space Path Loss (FSPL): FSPL represents the attenuation of radio energy as it travels through free space. It increases with distance and frequency, reducing the signal strength as the distance from the transmitter increases.
The output power of the receiving station is related to how strong a signal it sends out, not how well it can receive or process incoming signals. Therefore, it does not affect the reception distance of incoming RF signals.
References:
* CWNA Certified Wireless Network Administrator Official Study Guide: Exam PW0-105, by David D.
Coleman and David A. Westcott.
* RF fundamentals and RF design considerations in wireless communication systems.
NEW QUESTION # 170
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