Exam Questions and Answers for CWNA-108 Study Guide Questions and Answers!
CWNP Certified Wireless Network Administrator Exam Certification Sample Questions and Practice Exam
The CWNA-108 exam is a vendor-neutral certification that covers the key aspects of wireless networking, including RF technologies, wireless LAN hardware and software, network architecture, security, and troubleshooting. CWNP Certified Wireless Network Administrator Exam certification exam is designed to provide a solid foundation for wireless network administrators, technicians, and engineers. CWNA-108 exam is also suitable for professionals who work in IT support roles and want to enhance their knowledge of wireless networking.
The CWNA-108 certification is an excellent choice for professionals who want to advance their careers in the field of wireless networking. CWNP Certified Wireless Network Administrator Exam certification demonstrates the candidate's expertise in wireless networking and their ability to design, implement, and troubleshoot wireless networks. CWNP Certified Wireless Network Administrator Exam certification is recognized globally and is highly valued by employers.
NEW QUESTION # 58
You are using a site survey tool for post-implementation validation. You have installed the appropriate adapter driver and imported a floor plan. Now, you want to take the next step in proper tool use. What must you do before gathering survey data after the floor plan is imported?
- A. Install iPerf
- B. Nothing, you can simply start capturing signal readings
- C. Install WinPCAP
- D. Calibrate the floor plan
Answer: D
Explanation:
Explanation
Calibrating the floor plan is what you must do before gathering survey data after the floor plan is imported when using a site survey tool for post-implementation validation. A site survey tool is a software application that can run on a laptop, tablet, smartphone, or other device that has a Wi-Fi adapter and a GPS receiver. A site survey tool can scan the wireless environment and collect information about the detected access points and client stations, such as their SSID, BSSID, channel, signal strength, security, and data rate. A site survey tool can also measure and display various metrics of network performance, such as throughput, jitter, packet loss, delay, and SNR. A site survey tool can also use a floor plan to visualize the wireless coverage and quality in different locations on a map. A floor plan is an image file that shows the layout and dimensions of a building or an area where the WLAN is deployed. A floor plan can be imported from various sources, such as a CAD file, a PDF file, an image file, or a Google Maps screenshot. After importing a floor plan into a site survey tool, it is necessary to calibrate the floor plan before gathering survey data. Calibrating the floor plan means adjusting the scale and orientation of the floor plan to match the actual size and direction of the area.
Calibrating the floor plan can be done by using a reference point or a reference line that has a known distance or angle in the real world. Calibrating the floor plan ensures that the survey data is accurate and consistent with the physical environment. References: 1, Chapter 7, page 290; 2, Section 4.3
NEW QUESTION # 59
You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you document your findings, what term do you use to describe the problem in this configuration?
- A. ACI
- B. CCI
- C. CCC
- D. Non-Wi-Fi interference
Answer: B
Explanation:
Explanation
The term used to describe the problem in this configuration is Co-Channel Interference (CCI)1. CCI occurs when multiple access points are on the same or overlapping channels, causing interference and degradation in network performance1. In this case, one AP is on channel 1 and the other is on channel 2, which are overlapping channels, leading to CCI1.
NEW QUESTION # 60
You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you look for in a protocol analyzers?
- A. Frames with the HN bit set to 1
- B. Retransmitted frames from multiple STAs at higher rates than other STAs
- C. Frames transmitted from the AP without acknowledgement
- D. Frames with the retry bit set to 0
Answer: B
NEW QUESTION # 61
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. BSS Color
- B. 6 GHz band support
- C. uplink MU-MIMO
- D. TWT
Answer: A
NEW QUESTION # 62
What parameter of the client driver should be configured on a Windows computer to optimize moving from one AP to another within the ESS?
- A. Roaming threshold
- B. ESSID selection
- C. SSID selection
- D. Band preference
Answer: A
NEW QUESTION # 63
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. WPAN
- B. BSS
- C. Ad-hoc
- D. IBSS
Answer: B
Explanation:
Explanation
A BSS (Basic Service Set) is a WLAN use case that represents an 802.11-based network that uses an AP (Access Point) and has several connecting clients. The AP acts as a central point of coordination and communication for the clients, which can include iPhones, iPads, laptops, desktops, or any other devices that have Wi-Fi capabilities. A BSS can be identified by a unique BSSID (Basic Service Set Identifier), which is usually the MAC address of the AP's radio interface. A BSS can also be associated with an SSID (Service Set Identifier), which is a human-readable name that identifies the network. References: , Chapter 1, page 23; , Section 1.1
NEW QUESTION # 64
Which one of the following frequency ranges is not specified for use by IEEE 802.11 radios as of
802.11-2012?
- A. 600-630 MHz
- B. 5.15-5.25 GHz
- C. 5.725-5.874 GHz
- D. 2.4000-2.4835 MHz
Answer: A
NEW QUESTION # 65
ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous) 802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux- based RADIUS server will be used for authentication. What device in the bridge Implementation as the 802.1X Authenticator?
- A. The Ethernet switch
- B. The RADIUS server
- C. The root bridge
- D. All non-root bridges
Answer: A
NEW QUESTION # 66
Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?
- A. Grid and sector
- B. Dish and grid
- C. Dipole and yagi
- D. Patch and panel
Answer: C
NEW QUESTION # 67
You administer a small WLAN with nine access point. As a small business, you do not rum a RADIUS server and use WPA2-Personal for security. Recently, you changed the passphrase for WPA2-personal in all Aps and clients. Several users are now reporting the inability to connect to the network at time and it is constrained to one area of the building. When using scanner, you see that the AP covering that area is online
- A. The AP that covers the problem area is improperly configured
- B. The AP that covers the problem area requires a firmware update
- C. The clients are improperly configured
- D. The AP that covers the problem area has failed
Answer: B
NEW QUESTION # 68
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 first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
- D. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
Answer: C
Explanation:
Explanation
OFDM is a modulation method that divides the channel bandwidth into multiple subcarriers, each carrying a single data symbol. This allows for higher data rates and more robust transmissions in multipath environments.
OFDM was first introduced in the 802.11a standard, which operates in the 5 GHz band and supports data rates up to 54 Mbps. Later, the 802.11g standard adopted OFDM for the 2.4 GHz band, and the 802.11n and
802.11ac standards enhanced OFDM with features such as MIMO (Multiple Input Multiple Output), channel bonding, and higher-order modulation schemes to achieve data rates up to 600 Mbps and 6.9 Gbps, respectively. These standards are collectively known as the ERP (Extended Rate PHY), HT (High Throughput), and VHT (Very High Throughput) PHYs . 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 # 69
You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2.
When you document yoy findings, what term do you use to describe the problem in this configuration?
- A. Bluetooth interference
- B. CCI
- C. ACI
- D. Non-Wi-Fi interference
Answer: C
Explanation:
Adjacent channel interference is more serious and occurs when 2 or more AP's are on overlapping channels, for example channel 1 + 4 on the 2.4Ghz band. ACI creates overlap in the frequency space causing corrupted data and layer 2 re-transmissions.
NEW QUESTION # 70
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. APs
- B. Real-time FFT
- C. Clients
- D. Waterfall/Spectrogram
Answer: D
NEW QUESTION # 71
What is an advantage of using WPA3-Personal instead of WPA2-Personal as a security solution for 802.11 networks?
- A. WPA3-Personal, also called WPA3-SAE, uses an authentication exchange and WPA2-Personal does not
- B. WPA3-Personal, also called WPA3-SAE, uses a stronger authentication exchange to better secure the network
- C. WPA3-Personal, also called WPA3-SAE, uses AES for encryption and WPA2-Personal does not
- D. WPA3-Personal, also called WPA3-SAE, uses a better encryption algorithm than WPA2-Personal
Answer: B
Explanation:
Explanation
An advantage of using WPA3-Personal instead of WPA2-Personal as a security solution for 802.11 networks is that WPA3-Personal, also called WPA3-SAE, uses a stronger authentication exchange to better secure the network. WPA3-Personal uses Simultaneous Authentication of Equals (SAE) as the key exchange protocol, which provides stronger protection against offline dictionary attacks and password guessing than WPA2-Personal. SAE uses a Diffie-Hellman key exchange with elliptic curve cryptography (ECC) to establish a pairwise master key (PMK) between the AP and the client without revealing it to any eavesdropper. SAE also provides forward secrecy, which means that if one PMK is compromised, it does not affect the security of other PMKs. WPA2-Personal uses Pre-Shared Key (PSK) as the key exchange protocol, which is vulnerable to offline brute-force attacks if the passphrase is weak or leaked. Both WPA3-Personal and WPA2-Personal use AES for encryption, so there is no difference in that aspect. WPA3-Personal does not use a different encryption algorithm than WPA2-Personal, but rather a different key exchange protocol. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 307; [CWNA:
Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 297.
NEW QUESTION # 72
What standard is referenced in the 802.11-2016 specification and is recommended for robust WLAN client security?
- A. IPSec VPN
- B. SSID hiding
- C. WEP
- D. 802.1X/EAP
Answer: D
NEW QUESTION # 73
You are reporting on the RF environment in you facility. The manager asks you do describe the noise floor noted in the report. Which of the following is the best explanation?
- A. The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.
- B. The extra energy radiated by access points and clint devices beyond that intended for the signal.
- C. The RF energy that exists in the environment from intentional and unintentional RF radiators that forms the baseline above which the intentional signal of your WLAN must exist.
- D. The noise caused elevators, microwave ovens, and video transmitters.
Answer: C
NEW QUESTION # 74
What is an advantage of using WPA2-Personal instead of WEP-128 as a security solution for
802.11 networks?
- A. WPA2-Personal uses CCMP for encryption, and WEP-128 uses TKIP for encryption
- B. WPA2-Personal uses 802.1X/EAP for authentication, and WEP-128 uses preshared keys
- C. WPA2-Personal is based on IEEE 802.11 industry standards, but WEP is not
- D. WPA2-Personal uses dynamic encryption keys, and WEP-128 uses static keys
Answer: D
NEW QUESTION # 75
Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter. What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?
- A. A significant impedance mismatch between components in the RF system
- B. The use of 50 ohm cables longer than one meter in the RF system
- C. A Voltage Standing Wave Ratio (VSWR) of 1:1
- D. High output power at the transmitter and use of a low-gain antenna
Answer: A
Explanation:
Explanation
Return loss is a measure of how well the components of an RF system are matched in terms of their impedance. Impedance is the opposition to the flow of alternating current in a circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. When the impedance of the source, the transmission line, and the load are not equal, some of the power is reflected back to the source, causing a loss of forward power. This loss is expressed in decibels (dB) as return loss. The higher the return loss, the lower the reflection and the better the impedance matching. Conversely, the lower the return loss, the higher the reflection and the worse the impedance matching.
VSWR (Voltage Standing Wave Ratio) is another way of expressing the same concept. It is the ratio of the maximum voltage to the minimum voltage along a transmission line due to the interference of the incident and reflected waves. A VSWR of 1:1 means that there is no reflection and perfect impedance matching. A VSWR higher than 1:1 means that there is some reflection and impedance mismatch. The higher the VSWR, the higher the reflection and the lower the return loss.
Therefore, a significant impedance mismatch between components in an RF system will cause high reflection, high VSWR, and low return loss.
NEW QUESTION # 76
When a client moves to a new BSS within an ESS, what step is a part of the 802.11 reassociation process?
- A. The new access point transmits a Reassociation Response to the client station with a status value.
- B. The client station transmits a Reassociation Request frame to its currentaccess point.
- C. The current access point informs the IP gateway of the reassociation.
- D. The current access point triggers the client's reassociation service.
Answer: A
NEW QUESTION # 77
What statement about 802.11 WLAN bridges is true?
- A. WLAN bridges may support MIMO communication, but only if used in the GHz frequency band
- B. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
- C. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge
- D. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
Answer: A
NEW QUESTION # 78
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?
- A. 4 and 6
- B. 7 and 11
- C. 1 and 5
- D. 2 and 8
Answer: C
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 # 79
ABC Company has thousands of Wi-Fi users accessing their network on a daily basis. Their WLAN consists of 700 access points, 6 WLAN controllers, and a wireless network management system.
What network functions are performed by the enterprise-class WNMS?
- A. Radio management, fast roaming, key caching, and other centralized control plane operations
- B. Generating, encrypting, and decrypting 802.11 frames and collecting RF radio data.
- C. Centralized bridging of guest data traffic and application of firewall and QoS policies to data
- D. Management of WLAN controller configuration and provisioning of firmware updates
Answer: D
NEW QUESTION # 80
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CWNP CWNA-108 is a certification exam that is designed to test the skills and knowledge of individuals who want to become certified wireless network administrators. CWNA-108 exam is conducted by the Certified Wireless Network Professional (CWNP), which is a vendor-neutral organization that offers a range of certifications related to wireless networking.
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