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CWNP CWNA-108 (CWNP Certified Wireless Network Administrator) Exam is a certification exam designed for professionals who want to demonstrate their expertise in the field of wireless networking. CWNA-108 exam covers a wide range of topics related to wireless networking, such as wireless LAN design, installation, and troubleshooting. It is an industry-standard certification that is recognized globally and is highly valued by employers.
The CWNA-108 (CWNP Certified Wireless Network Administrator) certification exam is a highly sought after certification in the wireless networking field. CWNP Certified Wireless Network Administrator Exam certification exam is designed to test the knowledge and skills of wireless network administrators who are responsible for the design, implementation, and management of wireless networks.
CWNP CWNA-108 certification exam is a valuable certification for IT professionals who want to demonstrate their skills and knowledge in wireless networking technologies. CWNP Certified Wireless Network Administrator Exam certification is vendor-neutral and globally recognized by employers in the IT industry. It is an excellent investment for professionals who want to advance their careers in wireless networking, and it provides a solid foundation for further professional development and specialization.
NEW QUESTION # 24
What statement about 802.11 WLAN bridges is true?
- A. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
- B. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
- C. WLAN bridges may support MIMO communication, but only if used in the GHz frequency band
- D. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge
Answer: C
NEW QUESTION # 25
An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss.
The cable is connected to an antenna with 16 dBi of gain.
What is the EIRP power output?
- A. 250 mW
- B. 500 mW
- C. 2 W
- D. 1000 mW
Answer: D
NEW QUESTION # 26
When an ACK frame is not received by the transmitting STA, what is assumed?
- A. The receiver is offline
- B. The receiver processed the frame, but did not respond with an ACK frame because 802.11w is enabled
- C. The frame was correctly delivered
- D. The frame was not delivered and must be retransmitted
Answer: D
NEW QUESTION # 27
What factors will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS?
- A. The number of client stations associated to the BSS
- B. The layer 3 protocol used by each station to transmit data over the wireless link
- C. The presence of co-located (10m away) access points on non-overlapping channels
- D. The power management settings in the access point's beacons
Answer: A
NEW QUESTION # 28
What is the final step in an effective troubleshooting process?
- A. Document the results
- B. Disable the WLAN
- C. Verify the solution
- D. Notify the users of problem resolution
Answer: A
Explanation:
Explanation
The final step in an effective troubleshooting process is to document the results. Documentation is essential for keeping track of the problem history, the actions taken, the solutions implemented, and the outcomes achieved.
Documentation can also help to prevent future problems, improve best practices, and provide feedback for improvement. Documentation should include relevant information such as problem description, symptoms, root cause analysis, resolution steps, verification methods, and lessons learned. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 513; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 483.
NEW QUESTION # 29
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. RBAC
- B. VRRP
- C. WIPS
- D. IPSec
- E. WPA2
- F. SNMP
Answer: A
NEW QUESTION # 30
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 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. Due to 802.11 network operations and dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gbps Ethernet link .
- C. His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.
- D. His concern is valid and the company should upgrade all Ethernet link to 10 Gbps immediately.
Answer: D
NEW QUESTION # 31
When considering data rates available in HT and VHT PHY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?
- A. Antenna Height
- B. guard interval
- C. Frequency band in use
- D. client drivers
Answer: B
Explanation:
Explanation
The guard interval is a short period of time inserted between the symbols of an OFDM signal to prevent inter-symbol interference and improve the robustness of the transmission1. The guard interval can have different values depending on the 802.11 standard and the configuration of the device. For example, 802.11n supports two guard intervals: 800 ns (normal) and 400 ns (short)2. 802.11ac supports the same guard intervals as 802.11n, plus an optional 200 ns guard interval for 80 MHz and 160 MHz channels3. 802.11ax supports three guard intervals: 800 ns, 1600 ns, and 3200 ns4.
The guard interval affects the data rate because it determines the duration of each symbol. A shorter guard interval means more symbols can be transmitted in a given time, resulting in a higher data rate. However, a shorter guard interval also means less protection against inter-symbol interference, which may degrade the signal quality and increase the error rate. Therefore, there is a trade-off between data rate and reliability when choosing the guard interval.
The MCS tables for HT and VHT PHY devices show the data rates for different combinations of modulation, coding, channel width, spatial streams, and guard intervals. For example, for a VHT device using MCS 9 with QAM-256 modulation, 5/6 coding rate, 80 MHz channel width, and one spatial stream, the data rate is 433.3 Mbps with a normal guard interval (800 ns) and 486.7 Mbps with a short guard interval (400 ns)2. Therefore, the guard interval impacts the data rate according to the MCS tables.
NEW QUESTION # 32
The OSI model is a 7-layer model for understanding the functions of a communication system.
What OSI sublayers are specifically addressed by the IEEE 802.11-2012 standard? (Choose 2)
- A. Network
- B. Transport
- C. IP
- D. MAC
- E. PLCP
- F. PPDU
Answer: D,E
NEW QUESTION # 33
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 pseudo-random number assigned to each client by an AP.
- C. The SSID must be included in an association request frame.
- D. The SSID is a security session identifier used in RSNs.
Answer: C
NEW QUESTION # 34
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 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. Due to 802.11 network operations and dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gbps Ethernet link .
- C. His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.
- D. His concern is valid and the company should upgrade all Ethernet link to 10 Gbps immediately.
Answer: B
Explanation:
https://blogs.cisco.com/wireless/deploying-testing-and-tuning-802-11ac
NEW QUESTION # 35
What information is transmitted in the Beacon management frames of an HT access point to communicate about backward compatibility with ERP and HR/DSSS stations? (Choose 2)
- A. HT Protection mode
- B. Secondary channel offset
- C. Non-ERP Present field
- D. Power save mode of clients
- E. RIFS mode
Answer: A,B
NEW QUESTION # 36
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 was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
- C. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
- D. OFDM modulation is used only in 5 GHz 802.11 transmissions.
Answer: B
Explanation:
https://en.wikipedia.org/wiki/IEEE_802.11
NEW QUESTION # 37
What statement describes the authorization component of a AAA implementation?
- A. Verifying that a user is who he says he is.
- B. Validating client device credentials against a database.
- C. Granting access to specific network services or resources according to a user profile.
- D. Implementing a WIPS as a full-time monitoring solution to enforce policies.
Answer: C
NEW QUESTION # 38
In which plane of the three networking planes is an access point configured by a WLAN controller?
- A. Security
- B. Control
- C. Data
- D. Management
Answer: D
Explanation:
Explanation
An access point is configured by a WLAN controller in the management plane of the three networking planes.
The management plane is responsible for the configuration, administration, and monitoring of network devices, such as access points, switches, routers, and controllers. The WLAN controller communicates with the access point using a management protocol, such as CAPWAP or SNMP, to send configuration commands and receive status information. The control plane is responsible for the routing, switching, and forwarding of network traffic, such as data frames and control frames. The WLAN controller may also participate in the control plane by performing functions such as authentication, encryption, roaming, and load balancing. The security plane is responsible for the protection of network devices and data from unauthorized access, modification, or disclosure. The WLAN controller may also participate in the security plane by implementing features such as firewall, VPN, IDS/IPS, and WIPS. The data plane is responsible for the transmission and reception of user data, such as voice, video, or web traffic. The WLAN controller may or may not participate in the data plane depending on the architecture of the WLAN. In some cases, the access point forwards the user data directly to the wired network without involving the WLAN controller (distributed data forwarding).
In other cases, the access point tunnels the user data to the WLAN controller before forwarding it to the wired network (centralized data forwarding). References: CWNA-109 Study Guide, Chapter 9: Wireless LAN Architecture, page 279
NEW QUESTION # 39
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. Fresnel zone thinning
- B. MU-MIMO
- C. Ohm's law
- D. Inverse square law
Answer: D
NEW QUESTION # 40
Which one of the following channels can be used for VHT transmissions?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 41
In a long-distance RF link, what statement about Fade Margin is true?
- A. The Fade Margin is a measurement of signal loss through free space, and is a function of frequency and distance.
- B. Fade Margin is an additional pad of signal strength designed into theRF system to compensate for unpredictable signal fading.
- C. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnelzone is clear of obstructions.
- D. The Fade Margin of a long-distance radio link should be equivalent to the receiver's antenna gain.
Answer: B
NEW QUESTION # 42
Option 43 must be configured to allow access points to locate controller. In what network service should this option be configured?
- A. DNS
- B. RADIUS
- C. LDAP
- D. DHCP
Answer: D
NEW QUESTION # 43
What statement about 802.11 WLAN bridges is true?
- A. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
- B. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
- C. WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band
- D. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge
Answer: A
Explanation:
Explanation
WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally. A WLAN bridge is a device that connects two or more networks using the 802.11 protocol. A WLAN bridge must have a clear and strong signal between the two endpoints to ensure reliable and fast data transmission. The signal-to-noise ratio (SNR) is a measure of the quality of the signal, which depends on the distance, interference, obstacles, and antenna gain between the transceivers. A higher SNR means a better signal quality and a higher data rate. A lower SNR means a worse signal quality and a lower data rate. Therefore, a WLAN bridge must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally1.
NEW QUESTION # 44
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. Protocol analyzer
- B. WLAN scanner tool
- C. Site survey utility
- D. Spectrum analyzer
Answer: B
NEW QUESTION # 45
What frame type is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS?
- A. Beacon
- B. PS-Poll
- C. RTS
- D. ACK
Answer: C
Explanation:
Explanation
The frame type that is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS is RTS. RTS stands for Request to Send and is a control frame that is sent by a station to request access to the medium for a specified duration. The RTS frame contains the source and destination MAC addresses, as well as a Network Allocation Vector (NAV) value that indicates how long the medium will be occupied. The destination station responds with a Clear to Send (CTS) frame that echoes the NAV value and grants permission to the source station. All other stations in the BSS hear either the RTS or CTS frame and update their NAV timers accordingly, deferring their transmissions until the medium is free. The RTS/CTS mechanism can be used to prevent hidden node problems, reduce collisions, and protect high data rate frames that use features such as 802.11n or 802.11ac that may not be compatible with legacy stations. ACK, Beacon, and PS-Poll are not used to reserve the medium for high data rate frames. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 112; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 102.
NEW QUESTION # 46
As you prepare for a site survey in a multi-floor corporate office, you have learned about several wireless devices that support connection-oriented, real-time applications. These applications are sensitive to service interruptions and require excellent signal quality, low latency, and low loss.
For that reason, it is important to identify sources of RF interference as well as building characteristics that would cause RF blockage or dead spots.
What systems or environmental characteristics are most likely to cause interference or RF blockage and disrupt service for these applications? (Choose 2)
- A. Narrow hallways
- B. Elevator shafts
- C. Workspace dividers
- D. Microwave ovens
- E. RFID chokepoints
Answer: B,D
NEW QUESTION # 47
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