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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IEEE 802.11 Protocols and Devices | 20% | - CSMA/CA
|
| Topic 2: IEEE 802.11 Regulations and Standards | 15% | - Regulatory Bodies and Domains
|
| Topic 3: IEEE 802.11 Network Implementation | 20% | - Power over Ethernet (PoE)
|
| Topic 4: IEEE 802.11 Network Security | 15% | - Encryption and Authentication
|
| Topic 5: Radio Frequency (RF) Technologies | 15% | - RF Fundamentals
|
| Topic 6: IEEE 802.11 Network Operations | 15% | - Troubleshooting
|
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NEW QUESTION # 36
What 802.11ac and 802.11ax feature allows an AP to transmit independent data streams to multiple client devices simultaneously on the same channel, improving efficiency in dense deployments?
Answer: A
Explanation:
Multi-User MIMO (MU-MIMO) allows an access point to transmit to multiple client devices at the same time, on the same channel, using spatial multiplexing. This is in contrast to single-user MIMO, where all spatial streams from an AP are directed to a single client at a time. MU-MIMO was introduced downlink-only in 802.11ac Wave 2 and expanded to include uplink MU-MIMO in
802.11ax, significantly improving efficiency and airtime utilization in environments with many concurrent client devices.
NEW QUESTION # 37
A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-802.11 device?
Answer: C
Explanation:
A laptop-based spectrum analyzer with a directional antenna is the best solution for locating a non- 802.11 device that is suspected of causing interference on the WLAN. A spectrum analyzer is a device or a software application that can measure and display the frequency spectrum of electromagnetic signals in a given range. A spectrum analyzer can show the amplitude, frequency, bandwidth, modulation, and other characteristics of different signals in the spectrum, which can help identify their sources and types. A spectrum analyzer can also detect non-802.11 devices that may cause interference on the WLAN, such as microwave ovens, cordless phones, Bluetooth devices, or radar systems. A laptop-based spectrum analyzer is a software application that runs on a laptop computer and uses an external USB adapter as its RF interface. A laptop- based spectrum analyzer has the advantage of being portable, flexible, and cost-effective compared to a hardware-based spectrum analyzer. A directional antenna is an antenna that radiates or receives RF signals more strongly in one direction than in others. A directional antenna has a high gain and a narrow beamwidth, which means it can focus the RF energy in a specific direction and reduce the interference from other directions. A directional antenna can also increase the range and sensitivity of the RF signal detection. To locate a non-802.11 device that is causing interference on the WLAN, a laptop-based spectrum analyzer with a directional antenna can be used to perform a technique called RF hunting or triangulation. This technique involves pointing the directional antenna in different directions and observing the signal strength and characteristics of the interfering device on the spectrum analyzer. By moving around and changing the direction of the antenna, the location of the interfering device can be estimated based on where the signal strength is highest and most consistent.
NEW QUESTION # 38
What is the purpose of an RF connector's impedance rating, and what is the standard impedance used in 802.11 WLAN systems?
Answer: B
Explanation:
Impedance is a measure of the opposition to current flow in an RF circuit, and it is critical that all components in an RF system, including cables, connectors, and antennas, share the same impedance rating. In 802.11 WLAN systems, the standard impedance is 50 ohms. When impedance is mismatched between components, some of the signal is reflected back toward the source instead of being radiated by the antenna, resulting in signal loss and reduced performance, a condition measured using Voltage Standing Wave Ratio (VSWR).
NEW QUESTION # 39
What is a common source of RF interference in the 2.4 GHz ISM band that does not originate from an 802.11 device?
Answer: B
Explanation:
Microwave ovens are a well-known source of non-802.11 RF interference in the 2.4 GHz ISM band, as they operate by emitting energy at frequencies that overlap with the Wi-Fi spectrum, particularly around channel 9-11. Other common non-802.11 interference sources in this band include cordless phones, Bluetooth devices, wireless video cameras, and certain types of industrial, scientific, and medical equipment. These devices do not follow 802.11 protocols and can cause unpredictable interference that a spectrum analyzer is needed to identify, since standard Wi-Fi survey tools cannot detect non-802.11 energy.
NEW QUESTION # 40
The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The users indicate that they need more throughput and all stations are 5 GHz capable 802.11ac clients. The current AP configuration uses 20 MHz channels in both
2.4 GHz and 5 GHz. What is the least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended?
Answer: C
Explanation:
The least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended is to use a 40 MHz channel on the
5 GHz radio. This solution can double the channel bandwidth and increase the data rates for the
5 GHz capable 802.11ac clients. Using a 40 MHz channel on the 5 GHz radio is also less likely to cause co- channel interference or overlap with other channels than using a 40 MHz channel on the 2.4 GHz radio, which has only three non-overlapping channels. Using a 160 MHz channel on the 5 GHz radio may provide even higher throughput, but it may also consume too much of the available spectrum and cause more interference with other devices or networks. Installing a second AP in the coverage area may also improve the throughput, but it may require additional costs and configuration.
NEW QUESTION # 41
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