NEW 2023 Certification Sample Questions CWNA-108 Dumps & Practice Exam

CWNA-108 Deluxe Study Guide with Online Test Engine

NEW QUESTION # 71
What is appended to the end of each 802.11 data frame after the payload?

• A. PHY header
• B. FCS
• C. MAC header
• D. Preamble

Answer: B

NEW QUESTION # 72
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. Lack of support for 802.11n
• B. CAT5e cabling run to the AP
• C. Weak signal strength
• D. Too few spatial streams

Answer: C

Explanation:
Explanation/Reference:

NEW QUESTION # 73
Your consulting firm has recently been hired to complete a site survey for a company. Your engineers use predictive design software for the task, but the company insists on a pre- deployment site visit. What task should be performed as part of the pre-deployment visit to prepare for a predictive design?

• A. Evaluate the building materials at ABC's facility and confirm that the floor plan documents are consistent with the actual building
• B. Test several antenna types connected to the intended Aps for use in the eventual deployment
• C. Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls
• D. Collect information about the company's security requirements and the current configuration of their RADIUS and user database servers

Answer: A

NEW QUESTION # 74
In an infrastructure Basic Service Set (BSS), how does the passive scanning process occur?

• A. Access points broadcast Beacons on all channels of each radio within the regulatory domain.
  Nearby client stations record information found in the Beacons for use in the association process.
• B. Client stations broadcast Probe Request frames on the single channel for which they are programmed. Nearby access points respond on that channel with Probe Response frames. Client stations record information found in the Probe Response frames for use in the association process.
• C. Access points broadcast Beacons on a single channel for which they are programmed. Nearby client stations listen for Beacon frames and record information found in the Beacons for use in the association process.
• D. Client stations broadcast Probe Request frames on all supported channels in the regulatory domain. Nearby access points respond with Probe Response frames. Client stations record information in the Probe Response frames for use in the association process.

Answer: C

NEW QUESTION # 75
What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?

• A. Grid antennas at each endpoint
• B. A minimum antenna gain of 11 dBi at both endpoints
• C. A Fresnel Zone that is at least 60% clear of obstructions
• D. Minimum output power level of 2 watts

Answer: C

NEW QUESTION # 76
In addition to throughput enhancements, what other improvements does a dual-band 802.11ac AP provide when compared with 802.11a/g APs? (Choose 2)

• A. Introduces "fast transition" roaming protocols for VoWiFi phones
• B. Increases in receive sensitivity enhance RTLS location accuracy
• C. Better link reliability between 802.11a/b/g client devices and 802.11ac APs
• D. Stronger security with more robust encryption modes.
• E. Improves service quality for real-time applications at greater distances

Answer: C,E

NEW QUESTION # 77
You are installing an AP to be used by 27 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?

• A. A 5 GHz channel, because channels 1 and 6 are 2.4 GHz channels they have no impact on the decision
• B. Channel 6, because it is always best to use this channel
• C. Channel 11, because channels 1 and 6 are in use nearby
• D. Channel 1, because it is best to use the channel with the lowest frequency

Answer: A

Explanation:
Explanation
A 5 GHz channel should be used for this AP because channels 1 and 6 are 2.4 GHz channels and they have no impact on the decision. The 5 GHz frequency band offers more non-overlapping channels than the 2.4 GHz frequency band, which reduces interference and improves performance. The 5 GHz frequency band also supports higher data rates and wider channel bandwidths than the 2.4 GHz frequency band, which increases capacity and throughput. The 5 GHz frequency band also has less interference from other devices and sources than the 2.4 GHz frequency band, which enhances reliability and quality of service. Therefore, it is recommended to use the 5 GHz frequency band for WLANs whenever possible. Channels 1 and 6 are two of the three non-overlapping channels in the 2.4 GHz frequency band (the other one is channel 11). They are used by a neighbor network in this scenario, but they do not affect the channel selection for this AP because they operate in a different frequency band than the 5 GHz frequency band. Channel 6 is not always best to use; it depends on the interference and congestion level in the environment. Channel 1 is not best to use because it has a lower frequency than channel 6; frequency does not determine channel quality or performance. Channel
11 is not best to use because it is also a 2.4 GHz channel and it may interfere with channels 1 and
6. References: CWNA-109 Study Guide, Chapter 4: Antenna Systems and Radio Frequency (RF) Components, page 113

NEW QUESTION # 78
A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following methods is commonly used to locate the controllers by the APs?

• A. DHCP
• B. NTP
• C. SNMP
• D. GRE

Answer: A

Explanation:
Explanation
DHCP (Dynamic Host Configuration Protocol) is a commonly used method to locate the controllers by the APs in a WLAN that is implemented using wireless controllers. DHCP is a protocol that allows a device to obtain an IP address and other network configuration parameters from a server. In a wireless controller scenario, the APs can use DHCP to request an IP address from a DHCP server, which can also provide the IP address or hostname of the wireless controller as an option in the DHCP response. This way, the APs can discover the wireless controller and establish a connection with it. Alternatively, the APs can also use other methods to locate the wireless controller, such as DNS (Domain Name System), broadcast or multicast discovery, or manual configuration. References: 1, Chapter 8, page 309; 2, Section 5.2

NEW QUESTION # 79
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

• A. 4 and 6
• B. 1 and 5
• C. 7 and 11
• D. 2 and 8

Answer: B

Explanation:
Explanation
In an 802.11 2.4 GHz system, channels 1 and 5 are considered non-overlapping. In the 2.4 GHz band, there are
14 channels defined by the IEEE 802.11 standard, but only 11 of them are available in North America and most other regions. Each channel has a bandwidth of 22 MHz, but they are spaced only 5 MHz apart from each other. This means that adjacent channels overlap with each other and cause interference. To avoid interference, it is recommended to use only non-overlapping channels, which are channels that do not share any frequency range with each other. In the 2.4 GHz band, there are only three non-overlapping channels:
channel 1, channel 6, and channel 11. However, some devices can use channel bonding to combine two adjacent channels into one wider channel of 40 MHz, which can provide higher throughput but also more interference. In this case, there are only two non-overlapping channels: channel 1+5 and channel
6+10. References: 1, Chapter 3, page 86; 2, Section 3.2

NEW QUESTION # 80
An 802.11-based network uses an AP and has several connecting clients. The clients include iPhones, iPads, laptops and one desktop. What WLAN use case is represented?

• A. BSS
• B. WPAN
• C. Ad-hoc
• D. IBSS

Answer: A

Explanation:
Explanation/Reference:

NEW QUESTION # 81
You are troubleshooting a problem with interference from a non-802.11 device. Given that the device is not a WLAN device, you cannot use a protocol analyzer and have chosen to use a spectrum analyzer. You want to view the signal from the interfering device over time to see the activity that is generating.
What common spectrum analyzer view should you use for this analysis?

• A. Clients
• B. Real-time FFT
• C. Waterfall/Spectrogram
• D. APs

Answer: C

NEW QUESTION # 82
What cipher suite is specified by the 802.11-2016 standard and is not deprecated?

• A. Wired Equivalent Privacy
• B. Temporal Key Integrity Protocol
• C. Extensible Authentication Protocol
• D. Counter Mode with CBC-MAC Protocol

Answer: D

Explanation:
Explanation
The cipher suite specified by the 802.11-2016 standard and is not deprecated is Counter Mode with CBC-MAC Protocol (CCMP). CCMP is an encryption protocol that uses Advanced Encryption Standard (AES) as the underlying cipher and provides confidentiality, integrity, and origin authentication for wireless data. CCMP is the mandatory encryption protocol for WPA2 and WPA3. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 295; [IEEE Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications], page 1560.

NEW QUESTION # 83
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. VHT (802.11ac)
• D. DSSS (802.11-Prime)

Answer: B

NEW QUESTION # 84
802. 11ax (HE) introduces Resource Units that can be used to allow communications with multiple devices at the same time, on the same channel, in the same BSS. What feature of 802.1 lax provides this functionality?

• A. Wi-Fi-LTE
• B. TWT
• C. OFDMA
• D. 6 GHz support

Answer: C

Explanation:
Explanation
The feature of 802.11ax (HE) that provides this functionality is OFDMA. OFDMA stands for Orthogonal Frequency Division Multiple Access and is a technology that allows multiple devices to communicate simultaneously on the same channel in the same BSS. OFDMA works by dividing a channel into smaller subchannels called Resource Units (RUs), which are composed of groups of subcarriers or tones. Each RU can be assigned to a different device based on its bandwidth requirement and signal quality. This way, OFDMA can increase the efficiency and capacity of the channel by reducing overhead, contention, and latency.
OFDMA can also support both uplink and downlink multi-user transmissions using trigger frames and buffer status reports. 6 GHz support, TWT, and Wi-Fi-LTE are not features of 802.11ax that provide this functionality. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 226; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 216.

NEW QUESTION # 85
What term describes the effect of increasing the intensity of an RF wave with an antenna by focusing the energy in a specific direction?

• A. Distributed Radiation
• B. Active Amplification
• C. RF Flooding
• D. Beam Compression
• E. Passive Gain

Answer: E

Explanation:
https://electronics.stackexchange.com/questions/312530/antenna-concept-is-it-a-passive-device- buthow-about-gain

NEW QUESTION # 86
When using a spectrum to look for non Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a users workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?

• A. Unintentional radiation from the PC power supply
• B. Excess RF energy from a nearby AP
• C. Bluetooth devices in the user's work area
• D. USB 3 devices in the user's work area

Answer: A

NEW QUESTION # 87
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

• A. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
• B. OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
• C. OFDM modulation is used only in 5 GHz 802.11 transmissions.
• D. OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.

Answer: D

Explanation:
Explanation

NEW QUESTION # 88
The network administrator at XYZ Company recently attended a training class on wireless security and realized that he should update the corporate security policy to address WLAN technology. The network administrator is listing the items that should be addressed in the security policy update, and has asked for your input.
What WLAN topics should be addressed by a company security policy? (Choose 3)

• A. Theft prevention and data security of WLAN infrastructure devices
• B. Training of the IT staff on WLAN operational security
• C. Wireless intrusion monitoring and response procedures
• D. WLAN performance analysis baseline documentation
• E. Wired network performance analysis and baseline documentation
• F. User density planning and AP client association thresholds

Answer: A,B,C

NEW QUESTION # 89
You are troubleshooting a controller-based AP that is unable to locate the controller. DHCP is not use and the controller is located at 10.10.10.81/24 while the AP is on the 10.10.16.0/24 network.
What should be inspected to verify proper configuration?

• A. AP hosts file
• B. NTP
• C. BOOTH
• D. DNS

Answer: D

NEW QUESTION # 90
You support a WLAN using dual-band 802.11ac three stream access points. All access points have both the
2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 5 GHz and 20 MHz channels in 2.4 GHz. A manager is concerned about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios. What do you tell him?

• A. His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
• B. His concern is valid and the company should upgrade all Ethernet links to 10 Gbps immediately.
• C. Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.
• D. His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.

Answer: C

Explanation:
Explanation
What you should tell him is that due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gbps Ethernet link. This is because the actual throughput of an 802.11 network is much lower than the theoretical data rates due to factors such as overhead, contention, interference, retransmissions, and environmental conditions. Moreover, the data rates used by devices on the network vary depending on their distance, signal quality, capabilities, and configuration.
Therefore, it is unlikely that both radios of the AP will simultaneously use the maximum data rates and saturate the 1 Gbps Ethernet link. Upgrading to a 10 Gbps Ethernet link or running a second 1 Gbps Ethernet link may be unnecessary and costly. Compressing all data before transmitting it onto the Ethernet link may introduce additional overhead and latency. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 227; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 217.

NEW QUESTION # 91
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?

• A. Install a second AP in the coverage area
• B. Use a 160 MHz channel on the 5 GHz radio
• C. Use a 40 MHz channel on the 2.4 GHz radio
• D. Use a 40 MHz channel on the 5 GHz radio

Answer: D

Explanation:
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. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 216; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 206.

NEW QUESTION # 92
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?

• A. 10 ms
• B. 104 ms
• C. 800 ns
• D. 400 ns

Answer: D

Explanation:
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 . References: [CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 163; [CWNA-108 Study Guide], Chapter 4:
Radio Frequency Signal and Antenna Concepts, page 157.

NEW QUESTION # 93
What authentication method is referenced in the 802.11-2016 and 802.11-2020 specifications and is recommended for robust WI-AN client security?

• A. 802.1X/EAP
• B. WEP
• C. IPSec
• D. SSL

Answer: A

Explanation:
Explanation
The authentication method that is referenced in the 802.11-2016 and 802.11-2020 specifications and is recommended for robust WLAN client security is 802.1X/EAP. 802.1X/EAP stands for IEEE 802.1X Port-Based Network Access Control with Extensible Authentication Protocol and is a framework that provides strong authentication and dynamic encryption key generation for WLAN clients. 802.1X/EAP involves three parties: the supplicant (the client), the authenticator (the AP or the controller), and the authentication server (usually a RADIUS server). The supplicant sends its credentials (such as username and password, certificate, or token) to the authenticator, which forwards them to the authentication server. The authentication server verifies the credentials and sends a response to the authenticator, which grants or denies access to the supplicant. The authentication server also generates a master key that is used to derive encryption keys for the data frames between the supplicant and the authenticator. 802.1X/EAP supports various EAP methods that offer different levels of security and flexibility, such as EAP-TLS, EAP-PEAP, EAP-TTLS, EAP-FAST, and EAP-SIM. SSL, IPSec, and WEP are not authentication methods, but rather encryption or security protocols that are not specific to WLANs or referenced in the 802.11 specifications. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 299; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 289.

NEW QUESTION # 94
Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?

• A. RADIUS
• B. DHCP
• C. LDAP
• D. DNS

Answer: B

Explanation:
Explanation
DHCP (Dynamic Host Configuration Protocol) is the network service where option 43 must be configured to allow access points to locate controllers. DHCP is a protocol that allows a device to obtain an IP address and other network configuration parameters from a server. In a wireless controller scenario, the access points can use DHCP to request an IP address from a DHCP server, which can also provide the IP address or hostname of the wireless controller as an option in the DHCP response. Option 43 is a vendor-specific option that can be used to encode custom information for different types of devices. For example, Cisco access points can use option 43 to receive the IP address of the wireless controller from the DHCP server, while Aruba access points can use option 43 to receive the hostname of the wireless controller from the DHCP server. This way, the access points can discover the wireless controller and establish a connection with it. References: 1, Chapter 8, page 309; 2, Section 5.2

NEW QUESTION # 95
You are the network administrator for ABC Company. Your manager has recently attended a wireless security seminar. The seminar speaker taught that a wireless network could be hidden from potential intruders if you disabled the broadcasting of the SSID in Beacons and configured the access points not to respond to Probe Request frames that have a null SSID field.
Your manager suggests implementing these security practices. What response should you give to this suggestion?

• A. To improve security by hiding the SSID, the AP and client stations must both be configured to remove the SSID from association request and response frames. Most WLAN products support this.
• B. Any tenants in the same building using advanced penetration testing tools will be able to obtain the SSID by exploiting WPA EAPOL-Key exchanges. This poses an additional risk of exposing the WPA key.
• C. This security practice prevents manufacturers' client utilities from detecting the SSID. As a result, the SSID cannot be obtained by attackers, except through social engineering, guessing, or use of a WIPS.
• D. Any 802.11 protocol analyzer can see the SSID in clear text in frames other than Beacons frames. This negates any security benefit of trying to hide the SSID in Beacons and Probe Response frames.

Answer: D

NEW QUESTION # 96
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CWNP CWNA-108 certification exam is an essential certification program for professionals who are responsible for designing, implementing, and managing wireless networks. CWNP Certified Wireless Network Administrator Exam certification program is globally recognized and vendor-neutral, making it an excellent choice for IT professionals who want to enhance their skills and knowledge in wireless networking technologies. The CWNP organization is known for its rigorous certification programs that are designed to test the candidate's practical knowledge and real-world experience.

 

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