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The CWNP Wireless Network Administrator (CWNA) (CWNA-109) practice questions (desktop and web-based) are customizable, meaning users can set the questions and time according to their needs to improve their discipline and feel the real-based exam scenario to pass the CWNP CWNA-109 Certification. Customizable mock tests comprehensively and accurately represent the actual CWNA-109 certification exam scenario.
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Troubleshooting and Management | 15% | - Monitoring and maintenance
|
| Topic 2: Radio Frequency (RF) Technologies | 20% | - Antenna concepts and types
|
| Topic 3: WLAN Network Architecture and Design Concepts | 15% | - WLAN deployment architectures
|
| Topic 4: WLAN Regulations and Standards | 15% | - IEEE 802.11 standards and amendments
|
| Topic 5: WLAN Network Security | 15% | - Security threats and mitigation
|
| Topic 6: WLAN Protocols and Devices | 20% | - Wireless hardware and software
|
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NEW QUESTION # 89
You are configuring an access point to use channel 128. What important fact should be considered about this channel?
Answer: C
Explanation:
It is a channel that may require DFS when used is an important fact that should be considered about channel 128. Channel 128 is a 5 GHz frequency band 20 MHz channel that has a center frequency of 5.64 GHz. Channel 128 is one of the channels that are subject to DFS (Dynamic Frequency Selection) rules, which require Wi-Fi devices to monitor and avoid using channels that are occupied by radar systems or other primary users. DFS is a feature that is defined in the IEEE 802.11h amendment and is mandated by some regulatory bodies, such as the FCC and the ETSI, to protect the licensed users of the 5 GHz band from interference by unlicensed Wi-Fi devices. DFS works by using a mechanism called channel availability check (CAC), which requires Wi-Fi devices to scan a channel for a certain period of time before using it. If a radar signal is detected during the CAC or while using the channel, the Wi-Fi devices must switch to another channel that is free from radar interference. When configuring an access point to use channel 128, it is important to consider the implications of DFS rules, such as:
The access point must support DFS and comply with the local regulations and standards that apply to DFS channels.
The access point may experience delays or interruptions in its operation due to CAC or channel switching.
The access point may have limited channel selection or availability due to radar interference or other Wi-Fi devices using DFS channels.
The access point may have compatibility or interoperability issues with some client devices that do not support DFS or use different DFS parameters.
The access point may have performance or quality issues due to co-channel or adjacent-channel interference from other Wi-Fi devices using non-DFS channels. Therefore, it is advisable to use channel 128 only when necessary and after performing a thorough site survey and spectrum analysis to determine the best channel for the access point.
NEW QUESTION # 90
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: C
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 # 91
A natural disaster has occurred in a remote area that is approximately 57 miles from the response team headquarters. The response team must implement a local wireless network using 802.11 WLAN access points.
What is the best method, of those listed, for implementation of a network back-haul for communications across the Internet in this scenario?
Answer: A
Explanation:
Cellular/LTE/5G is the best method for implementing a network backhaul for communications across the Internet in a remote area that is affected by a natural disaster. This is because cellular/LTE/5G networks are wireless and do not depend on physical infrastructure that may be damaged or unavailable in such scenarios.
Cellular/LTE/5G networks also offer high-speed data transmission and wide coverage area, which are essential for emergency response operations. 802.11 bridging to the response team headquarters is not feasible because it requires line-of-sight and has limited range. Turning up the output power of the WLAN at the response team headquarters is not effective because it may cause interference and does not guarantee reliable connectivity. Temporary wired DSL is not practical because it requires installing cables and equipment that may not be available or accessible in a remote area. References: CWNA-109 Study Guide, Chapter 7:
Wireless LAN Topologies, page 2031
NEW QUESTION # 92
You are troubleshooting a problem with a new 802.11ax AP. While the AP supports four spatial streams, most clients are only achieving maximum data rates of 150 Mbps. What is the likely cause?
Answer: C
Explanation:
The scenario described suggests that while the Access Point (AP) is capable of 802.11ax (Wi-Fi
6) with four spatial streams, the clients are only achieving data rates typical of 802.11n (Wi-Fi 4) devices, which indicates that the clients are likely 802.11n devices. Here's why this is the most plausible explanation:
802.11n Limitations: Devices that adhere to the 802.11n standard have lower maximum data rates compared to 802.11ax devices due to differences in technology such as modulation, spatial streams, and channel bandwidth. An 802.11n device with a single spatial stream operating on a
20 MHz channel can achieve a maximum data rate of 72.2 Mbps. Even with two spatial streams under ideal conditions, this would only double to approximately 144.4 Mbps, which is close to the
150 Mbps mentioned.
Spatial Stream Capability: The fact that the AP supports four spatial streams suggests it can achieve much higher data rates with 802.11ax clients that also support multiple spatial streams.
However, if the clients are 802.11n devices, they may not be capable of using more than two spatial streams, and many earlier 802.11n devices were limited to just one.
NEW QUESTION # 93
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
Answer: A
Explanation:
The short guard interval is an optional feature of 802.11n and 802.11ac that reduces the time between OFDM symbols from 800 ns to 400 ns. This can increase the data rate by about 11%, but also requires more precise timing and synchronization between the transmitter and the receiver. The short guard interval is only used when both the AP and the client support it and agree to use it.
NEW QUESTION # 94
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