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NEW QUESTION # 61
AP-1 is a 3x3:2 AP. STA-3 is a 3x3:3 client. What is the maximum number of spatial streams that can be used for a downlink HT-OFDM transmission from AP-1 to STA-3?
- A. Two spatial streams, because the definition of the AP indicates that it is capable of only two spatial streams.
- B. One spatial stream, because the definition of the AP indicates that it is capable of only one spatial stream.
- C. Three spatial streams, because the definition of the AP indicates that it is capable of only three spatial streams.
- D. Three spatial streams, because the definition of the client indicates that it is capable of only three spatial streams.
Answer: A
NEW QUESTION # 62
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 # 63
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. Collect information about the company's security requirements and the current configuration of their RADIUS and user database servers
- B. Test several antenna types connected to the intended Aps for use in the eventual deployment
- C. Evaluate the building materials at ABC's facility and confirm that the floor plan documents are consistent with the actual building
- D. Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls
Answer: C
NEW QUESTION # 64
Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even when the two APs are operating on non-overlapping channels (e.g. 1 & 6).
What deployment flaw could cause this problem?
- A. Reflective objects in the area are causing significant multipath.
- B. The access points are not synchronized to the same NTP server.
- C. The access points are mounted too closely to one another.
- D. A client station is using active scanning to probe for access points on multiple channels.
Answer: C
NEW QUESTION # 65
You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to your
2.4 GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz SSIds, which are different than the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with no difficulty. What is the likely problem?
- A. DoS attack
- B. Interference from non-Wi-Fi sources
- C. Interference from other WLANs
- D. Faulty drivers
Answer: D
Explanation:
Explanation
The likely problem that causes this scenario is faulty drivers. Drivers are software components that enable the communication between the operating system and the hardware devices, such as the wireless adapters. Faulty drivers can cause various issues with the wireless connectivity, such as not detecting or connecting to certain networks, dropping connections, or reducing performance. Faulty drivers can be caused by corrupted files, outdated versions, incompatible settings, or hardware defects. To fix faulty drivers, you can try to update, reinstall, or roll back the drivers, or contact the manufacturer for support. Interference from non-Wi-Fi sources, DoS attack, or interference from other WLANs are not likely to cause this scenario, as they would affect all devices in the same area, not just the new laptops. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 562; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 532.
NEW QUESTION # 66
A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss.
If the cable is connected to an antenna with 9 dBi gain, what is the EIRP at the antenna element?
- A. 13 dBm
- B. 26 dBm
- C. 23 dBm
- D. 10 dBm
Answer: C
NEW QUESTION # 67
During a post-implementation survey, you have detected a non-802.11 wireless device transmitting in the area used by handheld 802.11g scanners. What is the most important factor in determining the impact of this non-
802.11 device?
- A. Receive sensitivity
- B. Protocols utilized
- C. Airtime utilization
- D. Channel occupied
Answer: C
NEW QUESTION # 68
What statement about the SSID is true?
- A. The SSID is an alphanumeric value assigned to devicemanufacturers by the IEEE.
- B. The SSID is a security session identifier used in RSNs.
- C. The SSID must be included in an association request frame.
- D. The SSID is a pseudo-random number assigned to each client by an AP.
Answer: C
NEW QUESTION # 69
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. WIPS
- B. SNMP
- C. WPA2
- D. RBAC
Answer: D
NEW QUESTION # 70
What statement about the IEEE 802.11-2016 QoS facility is true?
- A. Four 802.1p user priorities are mapped to eight 802.11 transmit queues.
- B. 802.11 control frames are assigned to the 802.11 EF priority queue.
- C. When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.
- D. 802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.
Answer: D
Explanation:
Explanation
802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention. 802.11 QoS is based on the Enhanced Distributed Channel Access (EDCA) mechanism, which defines four access categories (ACs) for different types of traffic: Voice, Video, Best Effort, and Background. Each AC has its own transmit queue and contention parameters, such as Arbitration Interframe Space (AIFS), Contention Window (CW), and Transmission Opportunity (TXOP). These parameters determine how long a station has to wait before transmitting a frame and how long it can occupy the channel. Higher priority ACs have shorter AIFS, smaller CW, and longer TXOP, which means they have more chances to access the channel and send more data than lower priority ACs. However, this does not guarantee that higher priority ACs will always win the contention, as there is still a random backoff process involved. Therefore, 802.11 QoS is a statistical service that provides different levels of service quality based on traffic categories. References: , Chapter 10, page 403; , Section 6.1
NEW QUESTION # 71
What term correctly completes the following sentence?
In an IEEE 802.11 frame, the IP packet is considered by the MAC layer to be a(n) _________.
- A. IP datagram
- B. PLCP Protocol Data Unit (PPDU)
- C. MAC Protocol Data Unit (MPDU)
- D. MAC Service Data Unit (MSDU)
- E. PLCP Service Data Unit (PSDU)
Answer: D
NEW QUESTION # 72
What is the most effective method for testing roaming in relation to 802.11 VoIP handsets?
- A. Use a spectrum analyzer to monitor RF activity during a VoIP call.
- B. Use the built-in roaming monitor built into all VoIP handsets.
- C. Use a protocol analyzer to capture the traffic generated when a laptop roams.
- D. Place a call with the handset and move around the facility to test quality during roaming.
Answer: D
Explanation:
Explanation
The most effective method for testing roaming in relation to 802.11 VoIP handsets is to place a call with the handset and move around the facility to test quality during roaming. This method allows you to evaluate the actual performance and user experience of VoIP calls over wireless networks, as well as identify any potential issues such as signal strength, interference, latency, jitter, packet loss, or handoff delays. A spectrum analyzer can only show you the RF activity during a VoIP call, but not how it affects the voice quality or roaming behavior. A protocol analyzer can capture the traffic generated when a laptop roams, but it cannot simulate the characteristics of a VoIP handset such as battery life, antenna design, codec support, or QoS features. A built-in roaming monitor is not a common feature in all VoIP handsets, and it may not provide accurate or comprehensive information about the roaming process. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 487; [Voice over Wireless LAN 4.1 Design Guide], page 6-19.
NEW QUESTION # 73
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?
- A. OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
- B. OFDM modulation is used only in 5 GHz 802.11 transmissions.
- C. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
- 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 # 74
What terms accurately complete the following sentence?
The IEEE 802.11-2016 standard specifies mandatory support of the _______________ cipher suite for Robust Security Network Associations, and optional use of the ________________ cipher suite, which is designed for use with pre-RSNA hardware and is deprecated.
- A. RC5, RC4
- B. TLS, SSL
- C. 802.1X/EAP, WEP
- D. CCMP, TKIP
Answer: D
NEW QUESTION # 75
The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz). What is the center frequency of channel 4?
- A. 2.417
- B. 2.427
- C. 2.413
- D. 2.422
Answer: B
NEW QUESTION # 76
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. IBSS
- C. Ad-hoc
- D. WPAN
Answer: A
NEW QUESTION # 77
What security solution is required to be used in place of Open System Authentication for all open network
802.11 implementations in the 6 GHz band?
- A. WPA3-Enterprise
- B. WPA3-SAE
- C. Kerberos
- D. OWE
Answer: D
NEW QUESTION # 78
You have received a report of poor wireless connections on the third floor of a building under your administration. Three individuals have reported the problem. Apparently, the connections are reporting a strong signal, but the users cannot access the Internet. With the problem identified, what is the next logical step in the troubleshooting process?
- A. Perform corrective actions
- B. Discover the scale of the problem
- C. Verify the solution
- D. Create a plan of action or escalate the problem
Answer: A
NEW QUESTION # 79
Which of the following frequency ranges are specified for use by IEEE 802.11 radios? (Choose all that apply.)
- A. 5.725 - 5.875 GHz
- B. 5.15 - 5.25 GHz
- C. 902 - 928 MHz
- D. 5.470 - 5.725 GHz
- E. 2.4000 - 2.4835 GHz
Answer: A,B,D,E
NEW QUESTION # 80
You are deploying a WLAN monitoring solution that utilizes distributed sensor devices. Where should sensors be deployed for best results? Choose the single best answer.
- A. Every 20 feet and alongside each AP
- B. Closer to the APs
- C. Closer to the client devices
- D. IN critical areas where WLAN performance must be high
Answer: C
NEW QUESTION # 81
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?
- A. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.
- B. VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.
- C. Legacy Power Save mode was removed in the 802.11ac amendment.
- D. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.
Answer: A
Explanation:
Explanation
VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them. VHT TXOP power save is a feature introduced in the 802.11ac amendment that improves battery life for devices on a WLAN by allowing them to enter sleep mode more frequently and for longer periods of time. It works by using a new field called partial AID in the preamble of VHT frames that indicates which stations are addressed by the frame. This allows stations to quickly determine if they need to wake up and receive the frame or stay in sleep mode and save power. This reduces the overhead and latency of legacy Power Save mode, which requires stations to wake up periodically and listen to Beacon frames or other control frames to check if there are any buffered frames for them at the AP. References: , Chapter 3, page 117; , Section 3.2
NEW QUESTION # 82
You are managing a wireless access point in autonomous mode using the Web based interface. You capture traffic during this management task and notice that you can see the HTML code of the Web pages used for access point management. What error in administration could be the cause of this security concern?
- A. IPsec is not in use of the management connection as recommended
- B. A VPN with the AP is not established
- C. WPA2 is disabled on the WLAN
- D. HTTP is in use instead of HTTPS
Answer: D
Explanation:
Explanation
The error in administration that could be the cause of this security concern is that HTTP is in use instead of HTTPS. HTTP is an unencrypted protocol that transfers data in plain text over the network. This means that anyone who captures the traffic can see the HTML code of the Web pages used for access point management, as well as any sensitive information such as passwords or configuration settings. HTTPS is an encrypted protocol that uses SSL/TLS to secure the data transmission between the Web browser and the Web server.
HTTPS prevents anyone from snooping on or tampering with the Web traffic. Therefore, HTTPS should always be used for Web based management of wireless access points, especially in autonomous mode where there is no centralized controller to enforce security policies. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 431; [HTTP vs HTTPS: What's The Difference And Why Should You Care?].
NEW QUESTION # 83
What ID is typically mapped to an AP's MAC address if a single BSS is implemented?
- A. SSID
- B. VLAN ID
- C. BSSID
- D. Device ID
Answer: C
Explanation:
Explanation
The BSSID (Basic Service Set Identifier) is typically mapped to an AP's MAC address if a single BSS is implemented. The BSSID is a unique identifier that distinguishes one BSS from another within the same RF medium. It is usually derived from the MAC address of the AP's radio interface, but it can also be manually configured or randomly generated by some vendors. The BSSID is used by client stations to associate with an AP and to send and receive frames within a BSS. References: , Chapter 1, page 24; , Section 1.2
NEW QUESTION # 84
When a STA has authenticated to an AP (AP-1), but still maintains a connection with another AP (AP-2), what is the state of the STA on AP-1?
- A. Transitional
- B. Authenticated and Associated
- C. Authenticated and Unassociated
- D. Unauthenticated and Unassociated
Answer: C
Explanation:
Explanation
Authenticated and Unassociated. According to one of the web search results1, a STA can be authenticated to multiple APs, but it can only be associated to one AP at a time. Association is the process of establishing a logical link between the STA and the AP, which allows the STA to send and receive data frames through the AP2. Therefore, when a STA has authenticated to an AP-1, but still maintains a connection with another AP-2, it means that the STA is authenticated to both APs, but only associated to AP-2. The state of the STA on AP-1 is authenticated and unassociated, which means that the STA can switch to AP-1 without repeating the authentication process, but it cannot send or receive data frames through AP-1 until it becomes associated.
NEW QUESTION # 85
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