The Most In-Demand CWNP CWNA-108 Pass Guaranteed Quiz
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The CWNA-108 exam is a comprehensive test that covers a wide range of topics related to wireless networking. CWNA-108 exam covers topics such as RF technologies, WLAN hardware and software, network design, implementation, and troubleshooting. CWNA-108 exam is designed to test the candidate's knowledge of wireless networking concepts and their ability to apply them in real-world scenarios.
NEW QUESTION # 41
What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?
- A. Shared Key Authentication
- B. Open System Authentication
- C. AES
- D. CCMP
Answer: A
NEW QUESTION # 42
In which plane of the three networking planes is an access point configured by a WLAN controlled?
- A. Control
- B. Data
- C. Management
- D. Security
Answer: C
NEW QUESTION # 43
To ease user complexity, your company has implemented a single SSID for all employees.
However, the network administrator needs a way to control the network resources that can be accessed by each employee based on their department.
What WLAN feature would allow the network administrator to accomplish this task?
- A. SNMP
- B. WPA2
- C. RBAC
- D. WIPS
Answer: C
NEW QUESTION # 44
What feature of 802.1 lax (HE) may impact design decisions related to AP placement and the spacing between same-channel BSS cells (3SAs) because it is designed to reduce overlapping BSS contention?
- A. TWT
- B. BSS Color
- C. 6 GHz band support
- D. uplink MU-MIMO
Answer: B
NEW QUESTION # 45
Which IEEE 802.11 physical layer (PHY) specifications include support for and compatibility with both ERP and HR/DSSS?
- A. OFDM (802.11a)
- B. HT (802.11n)
- C. DSSS (802.11-Prime)
- D. VHT (802.11ac)
Answer: B
NEW QUESTION # 46
What factor does not influence the distance at which an RF signal can be effectively received?
- A. Transmitting station's output power
- B. Receiving station's output power
- C. Receiving station's radio sensitivity
- D. Free Space Path Loss
Answer: B
Explanation:
Explanation
The distance at which an RF signal can be effectively received depends on several factors, such as the transmitting station's output power, the free space path loss, the receiving station's radio sensitivity, and the environmental noise and interference. However, the receiving station's output power does not influence this distance, because it only affects how well the receiving station can transmit signals back to the transmitting station. The output power of the receiving station is irrelevant for receiving signals from the transmitting station12. References: CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page
79; CWNA-108 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 74.
NEW QUESTION # 47
As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an area. What term describes the rate at which this expansion happens?
- A. Ohm's law
- B. MU-MIMO
- C. Inverse square law
- D. Fresnel zone thinning
Answer: C
NEW QUESTION # 48
When considering data rates available in HT and VHT PJY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?
- A. The height of the antennas
- B. The guard interval
- C. The client drivers
- D. The Frequency band in use
Answer: B
NEW QUESTION # 49
A natural disaster has occurred in a remote area that is approximately 40 miles from the response team headquarters. The response team must setup a local wireless network using 802.11 WLAN access points. What is the best method, of those listed, for implementation of network backhaul for communications across the Internet in this scenario?
- A. 802.11 bridging
- B. Temporary wired cable
- C. Temporary wired DSL
- D. Cellular/LTE
Answer: D
NEW QUESTION # 50
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?
- A. Site survey utility
- B. Protocol analyzer
- C. Spectrum analyzer
- D. WLAN scanner tool
Answer: D
NEW QUESTION # 51
What feature of 802.1 lax (HE) is managed with beacon and trigger frames and is primarily a power management method, but also provides more efficient access to the channel used within a BSS?
- A. OFDMA
- B. BSS Color
- C. UL-MU-MIMO
- D. TWT
Answer: D
Explanation:
Explanation
TWT is the feature of 802.11ax (HE) that is managed with beacon and trigger frames and is primarily a power management method, but also provides more efficient access to the channel used within a BSS. TWT stands for target wake time, which is a mechanism that allows an access point and a client device to negotiate and schedule specific times for data transmission and reception. This enables the client device to enter a low-power sleep mode when it is not expected to communicate with the access point, which saves battery life and reduces power consumption. TWT also reduces contention and interference on the channel used within a BSS, as it coordinates the transmissions of multiple client devices and avoids collisions. TWT is managed with beacon and trigger frames, which are two types of management frames that are used to announce and initiate data exchanges. A beacon frame is a frame that is periodically sent by an access point to advertise its presence, capabilities, and parameters to client devices. A trigger frame is a frame that is sent by an access point or a client device to request or initiate a data transmission with another device. BSS color, UL-MU-MIMO, and OFDMA are other features of 802.11ax (HE) that are not primarily power management methods, but rather performance enhancement methods. BSS color is a feature that assigns a color code to each BSS to differentiate it from other BSSs that use the same channel. This reduces interference and improves spatial reuse of the channel. UL-MU-MIMO is a feature that allows an access point to receive multiple simultaneous transmissions from different client devices using multiple spatial streams. This increases capacity and throughput of the uplink direction. OFDMA is a feature that divides a channel into smaller subchannels called resource units (RUs) that can be allocated to different devices for concurrent transmissions. This increases efficiency and flexibility of the channel utilization. References: CWNA-109 Study Guide, Chapter 10:
Wireless LAN Operation, page 323
NEW QUESTION # 52
Which one of the following channels can be used for VHT transmissions?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 53
What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?
- A. A Fresnel Zone that is at least 60% clear of obstructions
- B. A minimum antenna gain of 11 dBi at both endpoints
- C. Minimum output power level of 2 watts
- D. Grid antennas at each endpoint
Answer: A
NEW QUESTION # 54
Which one of the following is not a factor considered when calculating the Link Budget for an outdoor point-to- point WLAN bridge link?
- A. Transmit power
- B. MU-MIMO capabilities of the bridges
- C. Receive antenna gain
- D. Operating frequency
Answer: B
NEW QUESTION # 55
A client complains of low data rates on his computer. When you evaluate the situation, you see that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an 802.11ac client and connects to an
802.11ac AP. Both the client and AP are 2x2:2 devices. What is the likely cause of the low data rate issue?
- A. CAT5e cabling run to the AP
- B. Weak signal strength
- C. Lack of support for 802.11n
- D. Too few spatial streams
Answer: B
Explanation:
Explanation
Weak signal strength is the likely cause of the low data rate issue for the client that has a signal strength of -84 dBm and a noise floor of -96 dBm. The client is an 802.11ac client and connects to an 802.11ac AP. Both the client and AP are 2x2:2 devices. Signal strength is the measure of how strong the RF signal is at the receiver.
Signal strength can affect the reliability and performance of the wireless connection, as well as the data rate and throughput of the traffic. The higher the signal strength, the better the signal quality and the higher the data rate. The lower the signal strength, the worse the signal quality and the lower the data rate.
The data rate of an 802.11ac connection depends on several factors, such as channel bandwidth, modulation and coding scheme (MCS), spatial streams, guard interval, and beamforming. However, these factors are also influenced by the signal strength, as they require a certain signal-to-noise ratio (SNR) to operate properly.
SNR is the ratio of the signal strength to the noise floor, which is the measure of the background noise or interference in the RF environment. The higher the SNR, the more robust and efficient the communication.
The lower the SNR, the more prone and vulnerable to errors and retries.
According to the CWNA Official Study Guide , Table 3.7, page 112, an 802.11ac connection with a channel bandwidth of 80 MHz, an MCS of 9, two spatial streams, a short guard interval, and no beamforming can achieve a maximum data rate of 867 Mbps. However, this data rate requires a minimum SNR of 30 dB to maintain a sufficient signal quality. If the signal strength is -84 dBm and the noise floor is -96 dBm, then the SNR is only 12 dB (-84 dBm - (-96 dBm) = 12 dB), which is far below the required SNR for this data rate.
Therefore, the data rate will drop significantly to match the lower SNR and signal quality.
To solve this problem, the signal strength should be increased to improve the SNR and data rate. This can be done by adjusting the output power or channel assignment of the AP or client, relocating or reorienting some APs or antennas to reduce attenuation or interference, updating or replacing some faulty or outdated hardware or software components, etc. References: , Chapter 3, page 112; , Section 3.2
NEW QUESTION # 56
Which of the following frequency ranges are specified for use by IEEE 802.11 radios? (Choose all that apply.)
- A. 902 - 928 MHz
- B. 5.470 - 5.725 GHz
- C. 5.15 - 5.25 GHz
- D. 5.725 - 5.875 GHz
- E. 2.4000 - 2.4835 GHz
Answer: B,C,D,E
NEW QUESTION # 57
What advantages does using predictive site survey modeling software offer over performing a manual site survey? (Choose 2)
- A. It takes less time to create an initial site survey for a large facility when using predictive modeling software than when performing a manual survey.
- B. Predictive modeling software makes it simple to assess multiple different AP locations and then adjust and display the AP's expected coverage pattern in almost real-time.
- C. Predictive modeling software can predict the ideal access point location 100% of the time, whereas the results from manual surveyingare less reliable.
- D. The exact impact of interference sources from external networks can be more accurately measured when using predictive modeling software than with manual surveys.
- E. Predictive modeling software provides more reliable data than manual surveys when fine-tuning and validating access point placement after the installation.
Answer: A,B
NEW QUESTION # 58
In a long-distance RF link, what statement about Fade Margin is true?
- A. The Fade Margin of a long-distance radio link should be equivalent to the receiver's low noise filter gain.
- B. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.
- C. The Fade Margin is a measurement of signal loss through free space and is a function of frequency and distance.
- D. Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.
Answer: D
NEW QUESTION # 59
What statements about the beamwidth of an RF antenna are true?
- A. Horizontal and vertical beamwidth are calculated at the points in which the main lobe decreases power by 3 dB
- B. Vertical beamwidth is displayed (in degree) on the antenna's Azimuth chart.
- C. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
- D. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.
Answer: A
NEW QUESTION # 60
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