Free CWNA-108 Sample Questions and 100% Cover Real Exam Questions (Updated 123 Questions)
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The CWNA-108 exam covers a wide range of topics, including wireless network design, security, troubleshooting, and implementation. CWNP Certified Wireless Network Administrator Exam certification program is designed to provide candidates with a comprehensive understanding of wireless networking and prepare them for real-world scenarios. CWNA-108 exam is vendor-neutral, which means that it focuses on fundamental concepts and principles of wireless networking rather than specific vendor technologies.
NEW QUESTION # 65
You administer a WLAN that offers a guest SSID of GUESTNWORK. Users connect to the GUESTNWORK SSID, but report that they cannot browse the Internet. The devices simply report no Internet connection. What common problem causes this scenario?
- A. NTP issues
- B. Captive portal issues
- C. IP routing issues
- D. Hardware issues
Answer: B
Explanation:
Explanation
A common problem that causes this scenario is captive portal issues. A captive portal is a web page that requires users to authenticate or accept terms and conditions before accessing the Internet through a WLAN. A captive portal is often used for guest networks to provide security and control over the network access. A captive portal works by intercepting the user's web requests and redirecting them to the portal page until the user completes the required action. However, sometimes the captive portal may not work properly due to various reasons, such as browser settings, firewall rules, DNS configuration, or network errors. This can prevent the user from browsing the Internet or seeing the portal page. To troubleshoot captive portal issues, you can try to use a different browser, clear the browser cache and cookies, disable any VPN or proxy settings, manually enter the portal URL, or contact the network administrator. NTP issues, hardware issues, or IP routing issues are not common problems that cause this scenario. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 343; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 333.
NEW QUESTION # 66
As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an area. What describes the rate at which this expansion happens?
- A. Fresnel zone thinning
- B. Inverse square law
- C. Ohm's law
- D. MU-MIMO
Answer: B
Explanation:
Explanation
The inverse square law states that the signal strength of an RF wave is inversely proportional to the square of the distance from the source. This means that as the distance from the transmitter increases, the signal strength decreases rapidly.
References: Wireless Network Administrator Official Study Guide, Chapter 3, page 64.
NEW QUESTION # 67
You are deploying a WLAN with the access points configured for 10 mW of output power on the 2.4 GHz radios and 20 mW of output power on the 5GHz radios. Some semi-directional antennas are also in use. What kind of deployment is described?
- A. SOHO
- B. Standard office
- C. Residential
- D. High density
Answer: D
Explanation:
Explanation
A high-density deployment is a wireless network that is designed to support a large number of users and devices in a relatively small area. This type of deployment is often used in enterprise environments, such as offices, schools, and hospitals.
The use of semi-directional antennas in the deployment described in the question is a good indication that it is a high-density deployment. Semi-directional antennas can be used to focus the signal from an access point in a specific direction. This can help to reduce interference and improve performance in high-density environments.
The other answer choices are less likely to be correct for the following reasons:
* SOHO (small office/home office) deployments are typically smaller and less complex than high-density deployments.
* Residential deployments are typically even smaller and less complex than SOHO deployments.
* Standard office deployments may be high-density, but they may also be lower-density.
It is important to note that the type of deployment is not determined solely by the output power of the access points. However, the use of 10 mW of output power on the 2.4 GHz radios and 20 mW of output power on the
5GHz radios is also consistent with a high-density deployment.
Here are some additional tips for deploying a high-density wireless network:
* Use a site survey to determine the optimal placement of access points.
* Configure the access points to use non-overlapping channels.
* Use semi-directional or directional antennas to focus the signal and reduce interference.
* Implement a wireless intrusion prevention system (WIPS) to detect and mitigate rogue access points and other security threats.
NEW QUESTION # 68
What statement about 802.3. Clause 33 Power over Ethernet is true?
- A. When using CAT5 cabling, you increase the maximum draw available to the PD over that available with CAT6.
- B. Only endpoint PSEs are supported.
- C. Only midspan PSEs are supported.
- D. The lowest voltage drop is achieved when using CAT6 cable instead of CAT5 or CAT5e.
Answer: D
Explanation:
http://poe-world.com/Calculator/
NEW QUESTION # 69
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. WPAN
- D. Ad-hoc
Answer: A
Explanation:
Explanation/Reference:
NEW QUESTION # 70
A natural disaster has occurred in a remote area that is approximately 57 miles from the response team headquarters. The response team must implement a local wireless network using 802.11 WLAN access points.
What is the best method, of those listed, for implementation of a network back-haul for communications across the Internet in this scenario?
- A. Cellular/LTE/5G
- B. Temporary wired DSL
- C. 802.11 bridging to the response team headquarters
- D. Turn up the output power of the WLAN at the response team headquarters
Answer: A
Explanation:
Explanation
Cellular/LTE/5G is the best method for implementing a network backhaul for communications across the Internet in a remote area that is affected by a natural disaster. This is because cellular/LTE/5G networks are wireless and do not depend on physical infrastructure that may be damaged or unavailable in such scenarios.
Cellular/LTE/5G networks also offer high-speed data transmission and wide coverage area, which are essential for emergency response operations. 802.11 bridging to the response team headquarters is not feasible because it requires line-of-sight and has limited range. Turning up the output power of the WLAN at the response team headquarters is not effective because it may cause interference and does not guarantee reliable connectivity. Temporary wired DSL is not practical because it requires installing cables and equipment that may not be available or accessible in a remote area. References: CWNA-109 Study Guide, Chapter 7: Wireless LAN Topologies, page 2031
NEW QUESTION # 71
What feature of 802.1 lax (HE) is managed with beacon and trigger frames and is primarily a power management method, but also provides more efficient access to the channel used within a BSS?
- A. TWT
- B. OFDMA
- C. UL-MU-MIMO
- D. BSS Color
Answer: A
Explanation:
Explanation
TWT is the feature of 802.11ax (HE) that is managed with beacon and trigger frames and is primarily a power management method, but also provides more efficient access to the channel used within a BSS. TWT stands for target wake time, which is a mechanism that allows an access point and a client device to negotiate and schedule specific times for data transmission and reception. This enables the client device to enter a low-power sleep mode when it is not expected to communicate with the access point, which saves battery life and reduces power consumption. TWT also reduces contention and interference on the channel used within a BSS, as it coordinates the transmissions of multiple client devices and avoids collisions. TWT is managed with beacon and trigger frames, which are two types of management frames that are used to announce and initiate data exchanges. A beacon frame is a frame that is periodically sent by an access point to advertise its presence, capabilities, and parameters to client devices. A trigger frame is a frame that is sent by an access point or a client device to request or initiate a data transmission with another device. BSS color, UL-MU-MIMO, and OFDMA are other features of 802.11ax (HE) that are not primarily power management methods, but rather performance enhancement methods. BSS color is a feature that assigns a color code to each BSS to differentiate it from other BSSs that use the same channel. This reduces interference and improves spatial reuse of the channel. UL-MU-MIMO is a feature that allows an access point to receive multiple simultaneous transmissions from different client devices using multiple spatial streams. This increases capacity and throughput of the uplink direction. OFDMA is a feature that divides a channel into smaller subchannels called resource units (RUs) that can be allocated to different devices for concurrent transmissions. This increases efficiency and flexibility of the channel utilization. References: CWNA-109 Study Guide, Chapter 10:
Wireless LAN Operation, page 323
NEW QUESTION # 72
A string of characters and digits is entered into an AP and a client STA for WPA2 security. The string is 8 characters long. What is this string called?
- A. MSK
- B. WEP key
- C. Passphrase
- D. PSK
Answer: D
NEW QUESTION # 73
Which one of the following 802.11 PHYs is more likely to be used in an industrial deployment but not likely to be used in standard office deployments?
- A. HT
- B. OFDM
- C. SIG
- D. VHT
Answer: D
NEW QUESTION # 74
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. Faulty drivers
- D. Interference from other WLANs
Answer: C
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 # 75
A natural disaster has occurred in a remote area that is approximately 57 miles from the response team headquarters. The response team must implement a local wireless network using 802.11 WLAN access points.
What is the best method, of those listed, for implementation of a network back-haul for communications across the Internet in this scenario?
- A. Cellular/LTE/5G
- B. Temporary wired DSL
- C. 802.11 bridging to the response team headquarters
- D. Turn up the output power of the WLAN at the response team headquarters
Answer: A
Explanation:
Explanation
Cellular/LTE/5G is the best method for implementing a network backhaul for communications across the Internet in a remote area that is affected by a natural disaster. This is because cellular/LTE/5G networks are wireless and do not depend on physical infrastructure that may be damaged or unavailable in such scenarios.
Cellular/LTE/5G networks also offer high-speed data transmission and wide coverage area, which are essential for emergency response operations. 802.11 bridging to the response team headquarters is not feasible because it requires line-of-sight and has limited range. Turning up the output power of the WLAN at the response team headquarters is not effective because it may cause interference and does not guarantee reliable connectivity. Temporary wired DSL is not practical because it requires installing cables and equipment that may not be available or accessible in a remote area. References: CWNA-109 Study Guide, Chapter 7: Wireless LAN Topologies, page 2031
NEW QUESTION # 76
You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?
- A. All clients implement single spatial stream radios
- B. The clients are all 802.11n STAs or lower
- C. The short guard interval is also enabled
- D. The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
Answer: B
NEW QUESTION # 77
You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to 2.4 GHz APs, but is does not even see 5 GHz APs. While evaluating the issue, you determine that this problem is happening for all of the laptops of this model in the organization. Several other tablets connect on channel 48 and channel
52 in the same work areas. What is the likely problem?
- A. The access points are configured to disallow 5 GHz.
- B. The clients are configured to use WPA and 5 GHz channels only support WPA2.
- C. The antennas in the laptop have insufficient gain to detect the 5 GHz signals.
- D. The client drivers are faulty and should be upgraded.
Answer: D
Explanation:
Explanation
The client drivers are faulty and should be upgraded is the likely problem for the laptop that can see and connect to 2.4 GHz APs, but does not even see 5 GHz APs. The client drivers are the software components that enable the wireless adapter of the laptop to communicate with the operating system and the network. The client drivers are responsible for scanning the available wireless channels, detecting and connecting to the access points, negotiating the security and data rate parameters, and transmitting and receiving data frames. If the client drivers are faulty, outdated, or incompatible, they may cause various issues with the wireless performance and functionality, such as low data rates, poor signal strength, frequent disconnections, or inability to see or connect to certain access points or channels.
One of the possible causes of faulty client drivers is that they do not support or recognize some of the features or standards of the 802.11ac technology, such as wider channel bandwidths, higher modulation schemes, or DFS (Dynamic Frequency Selection) channels. This could explain why the laptop can see and connect to 2.4 GHz APs, but not 5 GHz APs, as 802.11ac operates only in the 5 GHz band and uses channels that are wider (up to 160 MHz) and higher (up to channel 165) than those used by previous standards. Moreover, some of the
5 GHz channels are subject to DFS rules, which require the access points and client stations to monitor and avoid using channels that are occupied by radar systems or other primary users. If the client drivers do not support or comply with DFS rules, they may not be able to see or connect to access points that use DFS channels.
To solve this problem, the client drivers should be upgraded to the latest version that supports and is compatible with 802.11ac features and standards. This can be done by downloading and installing the updated driver software from the manufacturer's website or using a device manager tool. Upgrading the client drivers may also improve other aspects of wireless performance and functionality, such as data rates, signal strength, security, and stability. References: 1, Chapter 12, page 493; 2, Section 8.1
NEW QUESTION # 78
Which unit of measurement is an absolute unit that is used to quantify received signal power levels on a logarithmic scale?
- A. SNR
- B. VSWR
- C. RSSI
- D. dBm
Answer: D
NEW QUESTION # 79
What security solution is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment?
- A. AES
- B. Open System Authentication
- C. CCMP
- D. Shared Key Authentication
Answer: D
NEW QUESTION # 80
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. RIFS mode
- B. HT Protection mode
- C. Secondary channel offset
- D. Non-ERP Present field
- E. Power save mode of clients
Answer: B,C
NEW QUESTION # 81
A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?
- A. 25.5 W
- B. 12.95 W
- C. 30 W
- D. 15.4 W
Answer: A
Explanation:
Explanation
PoE has different standards that define different power levels for PSEs and PDs. The original standard, IEEE
802.3af, defines two classes of PSEs: Class 3 (15.4 W) and Class 4 (30 W). The newer standard, IEEE 802.3at, also known as PoE+, defines four classes of PSEs: Class 0 (15.4 W), Class 1 (4 W), Class 2 (7 W), and Class 3 (12.95 W). The power level received at the PD is always lower than the power level provided by the PSE, due to cable resistance and power dissipation. The IEEE standards specify the minimum power level that must be received at the PD for each class of PSE. For a Class 4 PSE, the minimum power level received at the PD is
25.5 W910. References: CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page
295; CWNA-108 Study Guide, Chapter 7: Power over Ethernet (PoE), page 289.
NEW QUESTION # 82
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