CWNA-108 : Certified Wireless Network Administrator Exam

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CWNA-108
Certified Wireless Network Administrator
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Question: 629
If an RF signal is transmitted with a power of 10 dBm and has an antenna gain of 2 dBi, what is the EIRP if the cable loss is 3 dB?
A) 12 dBm
B) 15 dBm
C) 8 dBm
D) 9 dBm Answer: D
Explanation: EIRP is calculated as EIRP = Ptx + Gant -
Lcable = 10 dBm + 2 dBi - 3 dB = 9 dBm.
Question: 630
A radio wave travels through a vacuum and encounters a boundary
with a different medium. If the angle of incidence is 45 degrees and
the refractive index of the new medium is 1.5, what is the angle of refraction?
1. 30 degrees
2. 60 degrees
3. 45 degrees
4. 25 degrees Answer: A
Explanation: Using Snell's Law, n1 sin(?1) = n2 sin(?2). Thus,
2 1.5
sin(? ) = 1·sin(45° )
? ?2 ˜ 30°.
Question: 631
In a wireless communication system, what would be the SNR in dB if the received signal is -50 dBm and the noise floor is -90 dBm?
A) 40 dB
B) 30 dB
C) 20 dB
D) 10 dB
Answer: A
Explanation: SNR is calculated as SNR = Prx - Pnoise =
-50 dBm - (-90 dBm) = 40 dB.
Question: 632
When considering the diffraction of RF signals, what is the primary factor that determines the extent of diffraction around an obstacle?
1. The size of the obstacle
2. The frequency of the RF signal
3. The power of the RF signal
4. The distance to the obstacle Answer: B
Explanation: The frequency of the RF signal significantly affects diffraction; lower frequency signals tend to diffract more effectively around obstacles compared to higher frequencies.
Question: 633
received signal strength of -40 dBm, what is the SNR if the noise floor
is -100 dBm?
A) 50 dB
B) 40 dB
C) 60 dB
D) 70 dB
Answer: C
Explanation: SNR is calculated as SNR = Prx - Pnoise =
-40 dBm - (-100 dBm) = 60 dB.
Question: 634
In RF communication, if an antenna's gain is 4 dBi and the effective isotropic radiated power (EIRP) is 30 dBm, what is the transmitter's output power?
A) 26 dBm
If a wireless device operates at a frequency of 5 GHz and measures a
1. 30 dBm
2. 34 dBm
3. 28 dBm
Answer: A
Explanation: The output power can be calculated as Ptx =
EIRP - Gant = 30 dBm - 4 dBi = 26 dBm.
Question: 635
A signal experiences a loss of 15 dB while traveling through a medium. If the original signal strength is 25 dBm, what is the strength of the signal after the loss?
A) 20 dBm
B) 5 dBm
C) 15 dBm
D) 10 dBm
Answer: D
Explanation: The received signal strength is calculated as
Preceived = Pinitial - L = 25 dBm - 15 dB = 10 dBm.
Question: 636
A network engineer is tasked with implementing a WLAN that includes Ruckus access points and Ubiquiti devices. Which proprietary protocol should the engineer consider to enable effective load balancing among the access points?
ckus SmartLoad
co Load Balancing Protocol uba Load Balancing System
er: B
nation: Ruckus SmartLoad is a proprietary feature designed to optimize load balancing amon points, ensuring efficient distribution of client connections.
ion: 637
pany is planning to implement a wireless LAN in a large conference room. They are consid ceiling-mounted omnidirectional antenna. What is the primary benefit of using this type of in such an environment?
cused signal distribution
ter signal penetration through walls reased interference rejection
0-degree coverage er: D
nation: An omnidirectional antenna provides 360-degree coverage, making it suitable for
Ubiquiti AirMax
Ru
Cis
Ar
Answ
Expla g
access
Quest
A com ering
using a antenna
1. Fo
2. Bet
3. Inc
4. 36
Answ Expla
environments like conference rooms where users may be located in various positions.
Question: 638
When implementing a WLAN that includes Cisco and Ruckus access points, which feature allows for automatic adjustments to the RF environment based on client behavior?
1. Dynamic Frequency Selection (DFS)
2. Adaptive Radio Management (ARM)
3. Smart Channel Selection
4. Client Steering Answer: B
Explanation: Adaptive Radio Management (ARM) automatically adjusts RF settings based on client behavior and environmental conditions, optimizing performance across multiple vendors.
ion: 639
eless vendor is developing a new product for the European market that will operate in the 2.4 hat is one key requirement they must adhere to regarding the device's power output?
st not exceed 1000 mW EIRP.
st only operate with directional antennas.
st comply with the ETSI power limits of 20 dBm.
st allow for dynamic power adjustments based on signal quality. er: C
nation: In Europe, under ETSI regulations, devices operating in the 2.4 GHz band must not e er output of 20 dBm (100 mW) EIRP.
ion: 640
ne a scenario where a company has deployed both autonomous and controller-based access p the same network. Which of the following challenges is most likely to arise from this mixe ment?
ficulties in network-wide policy enforcement reased latency due to cloud management
Quest
A wir GHz
band. W
1. Mu
2. Mu
3. Mu
4. Mu
Answ
Expla xceed
a pow
Quest
Imagi oints
within d
deploy
1. Dif
2. Inc
3. Enhanced load balancing across all APs
4. Simplified client device connection processes Answer: A
Explanation: A mixed deployment of autonomous and controller-based access points can lead to inconsistencies in policy enforcement, complicating network management and client experience.
Question: 641
When deploying a wireless repeater in a network, which factor is most important to consider in order to minimize the potential for performance degradation due to increased latency?
1. The type of encryption used in the network.
2. The physical distance from the Access Point to the repeater.
3. The number of client devices connected to the repeater.
nation: The physical distance from the Access Point to the repeater is crucial because greater ces can lead to weaker signals and increased latency, negatively impacting overall network mance.
ion: 642
enario where client devices are experiencing poor roaming performance between Ruckus an iti access points, which of the following features could improve the situation?
iquiti SmartMesh co CleanAir
uba ClientMatch ckus ChannelFly
er: D
nation: Ruckus ChannelFly dynamically selects the best channel for access points to reduce rence and improve client performance, which can help enhance roaming capabilities.
ion: 643
The repeater's power source. Answer: B
Expla distan perfor
Quest
In a sc d
Ubiqu
1. Ub
2. Cis
3. Ar
4. Ru
Answ Expla
interfe
Quest
What is the maximum number of non-overlapping channels available for 802.11ac in the 5 GHz band when using standard channel widths?
1. 4
2. 8
3. 24
4. 12
Answer: C
Explanation: There are up to 24 non-overlapping channels in the 5 GHz band for 802.11ac when using standard channel widths.
Question: 644
2.11ax
.11n
.11ac 2.11g
er: A
nation: 802.11ax, also known as Wi-Fi 6, is designed to handle high-density environments w features like OFDMA and improved MU-MIMO, allowing for better throughput and lower latency
red to previous standards.
ion: 645
re tasked with ensuring the security of a corporate WLAN. During a routine audit, you disco ccess point that mimics your legitimate SSID. What is the most effective method to preven onnecting to this rogue device?
plement MAC address filtering on the legitimate APs
ploy Wireless Intrusion Prevention Systems (WIPS) to automatically disconnect rogue APs rease the transmit power of legitimate APs to overpower the rogue signal
ucate users to avoid connecting to unknown networks
In a scenario where a wireless network is designed to support high-density environments, which of the following 802.11 standards would you most likely implement to maximize throughput and minimize latency?
1. 80
2. 802
3. 802
4. 80
Answ
Expla ith
compa
Quest
You a ver a
rogue a t users
from c
1. Im
2. De
3. Inc
4. Ed
Answer: B
Explanation: Deploying a Wireless Intrusion Prevention System (WIPS) can actively detect and mitigate rogue access points by automatically disconnecting them from the network, providing a more robust solution than user education or MAC filtering.
Question: 646
In designing a WLAN for a high-density environment such as a stadium, which of the following considerations is most critical to ensure both capacity and coverage are adequately addressed?
1. Deploying APs with omnidirectional antennas only
2. Selecting a 2.4 GHz band exclusively to maximize coverage
3. Using a combination of 2.4 GHz and 5 GHz APs while implementing load balancing
4. Placing APs in corners of the venue to minimize interference Answer: C
alancing helps distribute client connections effectively.
ion: 647
onfiguring a captive portal, what user experience feature can significantly enhance guest ction while maintaining security?
User-friendly interface and clear instructions mediate access without authentication mplex login procedures
mited access to only a few websites er: A
nation: A user-friendly interface with clear instructions greatly enhances guest satisfaction by fying the connection process while maintaining necessary security measures.
ion: 648
pany is transitioning to a new wireless security protocol. What is one of the key features of fferentiates it from WPA2 in terms of user experience?
Explanation: A combination of 2.4 GHz and 5 GHz APs allows for greater capacity and coverage, while load b
Quest
When c satisfa
A.
1. Im
2. Co
3. Li
Answ Expla
simpli
Quest
A com WPA3
that di
1. WPA3 requires all devices to support 802.1X.
2. WPA3 does not support legacy devices.
3. WPA3 eliminates the need for encryption altogether.
4. WPA3 provides a simplified setup process for new devices. Answer: D
Explanation: WPA3 offers a simplified setup process for new devices, making it easier for users to connect securely without compromising security, improving the overall user experience compared to
WPA2.
Question: 649
In the context of WLAN design, what is the primary reason for utilizing a heatmap to visualize signal strength across a surveyed area?
etermine the number of clients connected to each AP dentify potential dead zones and areas of weak signal alculate the total bandwidth used by the network
er: C
nation: Heatmaps help visualize areas with strong and weak signals, allowing designers to id ones that require additional coverage.
ion: 650
onfiguring a WIDS (Wireless Intrusion Detection System), which of the following paramet for detecting rogue APs?
D broadcasting SI thresholds annel utilization
EAP types er: B
nation: RSSI thresholds are vital for WIDS to accurately determine the strength of signals fro APs and identify any unauthorized or rogue devices in the network.
To ensure that the APs are powered correctly
To d
To i
To c Answ
Expla entify
dead z
Quest
When c ers is
crucial
1. SSI
2. RS
3. Ch D.
Answ
Expla m
various
Question: 651
When configuring a wireless network that requires user authentication, which of the following protocols would be the least secure option for protecting against unauthorized access?
1. EAP-TTLS
2. EAP-MSCHAPv2
3. PEAP
4. EAP-FAST
Answer: B
Explanation: EAP-MSCHAPv2 is less secure than the other options because it relies on password-based authentication without the additional security provided by certificates, making it more vulnerable to attacks.
ion: 652
work engineer is implementing a WLAN in a large warehouse. What is the most critical fact er when selecting access points for this environment?
cess point aesthetics mber of available SSIDs pport for legacy devices
rability and range of access points er: D
nation: Durability and range are crucial in a warehouse environment due to potential physical and the need for extensive coverage across large areas.
ion: 653
pany implements a captive portal for guest access to its WLAN. Which of the following urations would best enhance security while still providing user convenience?
quire users to input their email address before accessing the network ow unlimited access without any authentication
plement a time-limited guest access token
Quest
A net or to
consid
1. Ac
2. Nu
3. Su
4. Du
Answ Expla
damage
Quest
A com config
1. Re
2. All
3. Im
4. Use a simple password shared openly with all guests Answer: C
Explanation: Implementing a time-limited guest access token enhances security by restricting the duration of access, while still providing a convenient way for guests to connect to the network.

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