Feb 09, 2024 PASS CWNP CWNA-108 EXAM WITH UPDATED DUMPS
CWNA-108 Questions PDF [2024] Use Valid New dump to Clear Exam
NEW QUESTION # 34
You are implementing a VHT-capable AP. Which one of the following channels is available in the
802.11-2016 standard that was not available before the ratification of 802.11 ac?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
Explanation
Channel 144 is a new channel that was added to the 5 GHz band by the 802.11ac amendment, which defines the VHT (Very High Throughput) PHY for WLANs. Channel 144 has a center frequency of 5720 MHz and a bandwidth of 20 MHz. It can also be combined with adjacent channels to form wider channels of 40 MHz, 80 MHz, or 160 MHz. Channel 144 is available in some regions, such as North America and Europe, but not in others, such as Japan and China . References: [CWNA-109 Study Guide], Chapter 3: Antennas and Accessories, page 121; [CWNA-108 Study Guide], Chapter 3: Antennas and Accessories, page 115;
[Wikipedia], List of WLAN channels.
NEW QUESTION # 35
When implementing PoE, what role is played by a switch?
- A. Power splitter
- B. PD
- C. PSE
- D. Midspan injector
Answer: C
NEW QUESTION # 36
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. Verify the solution
- C. Discover the scale of the problem
- D. Create a plan of action or escalate the problem
Answer: C
Explanation:
Explanation
Discovering the scale of the problem is the next logical step in the troubleshooting process after identifying the problem of poor wireless connections on the third floor of a building under your administration.
Troubleshooting is a systematic process of finding and resolving problems or issues in a network or a system.
Troubleshooting usually follows a general methodology that consists of several steps or phases, such as:
* Identifying the problem: This step involves defining and describing the problem clearly and accurately based on the symptoms and evidence observed or reported by users or administrators. For example, in this case, the problem is that three individuals have reported poor wireless connections on the third floor of a building.
* Discovering the scale of the problem: This step involves determining how widespread and severe the problem is by gathering more information and data from different sources and perspectives. For example, in this case, this step could involve checking if other users or devices on the third floor or other floors are experiencing similar issues, verifying if there are any changes or updates in the network configuration or environment that could affect the wireless connections, testing if there are any differences in performance or quality between different access points or channels on the third floor, etc.
* Performing corrective actions: This step involves applying possible solutions or fixes to resolve or mitigate the problem based on logical reasoning and analysis. For example, in this case, this step could involve adjusting the output power or channel assignment of the access points on the third floor, relocating or reorienting some access points or antennas to improve coverage or reduce interference, updating or replacing some faulty or outdated hardware or software components, etc.
* Verifying the solution: This step involves confirming that the problem is solved or improved by testing and monitoring the network performance and user satisfaction after applying corrective actions. For example, in this case, this step could involve measuring and comparing the signal strength and
* throughput of wireless connections on the third floor before and after performing corrective actions, asking for feedback from users who reported poor wireless connections to see if their issues are resolved or reduced, etc.
* Creating a plan of action or escalating the problem: This step involves documenting and reporting the problem and its solution for future reference and improvement purposes. It also involves deciding whether to close or escalate the problem depending on its status and severity. For example, in this case, this step could involve creating a report that summarizes what was done to troubleshoot and fix poor wireless connections on the third floor with relevant data and evidence to support it. It could also involve escalating poor wireless connections to higher-level administrators if they persist or worsen despite performing corrective actions.
References: 1, Chapter 12, page
NEW QUESTION # 37
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. 30 W
- B. 12.95 W
- C. 15.4 W
- D. 25.5 W
Answer: D
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 # 38
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. Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls
- C. Test several antenna types connected to the intended Aps for use in the eventual deployment
- D. Evaluate the building materials at ABC's facility and confirm that the floor plan documents are consistent with the actual building
Answer: D
NEW QUESTION # 39
You are implementing a multi-AP WLAN and fast secure roaming is essential. Which one of the following methods is an IEEE 802.11 standard method for fast roaming?
- A. Band steering
- B. Load balancing
- C. OKC
- D. FT
Answer: D
Explanation:
Explanation
FT (Fast Transition) is an IEEE 802.11 standard method for fast roaming. FT is defined in the IEEE 802.11r amendment and is also known as Fast BSS Transition (FBT) or Fast Secure Roaming. FT is a feature that allows a client station to quickly switch from one AP to another within the same ESS (Extended Service Set) without having to re-authenticate and re-associate with each AP. This reduces the latency and packet loss that may occur during roaming, thus improving the user experience and maintaining the security of the connection.
FT works by using pre-authentication and key caching mechanisms that allow the client station and the APs to exchange security information before the actual roaming occurs. This way, when the client station decides to roam to a new AP, it can use a fast reassociation request and response that contain only a few fields, instead of a full authentication and association exchange that require more time and data. References: 1, Chapter 9, page
367; 2, Section 6.3
NEW QUESTION # 40
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. 1000 mW
- C. 2 W
- D. 500 mW
Answer: B
NEW QUESTION # 41
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 allows the WLAN transceiver to disable more components when in a low power state.
- B. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.
- C. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.
- D. Legacy Power Save mode was removed in the 802.11ac amendment.
Answer: C
NEW QUESTION # 42
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 AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
- C. The short guard interval is also enabled
- D. The clients are all 802.11n STAs or lower
Answer: D
Explanation:
Explanation
https://7signal.com/802-11ac-migration-part-2-whats-nobodys-telling-you-about-80mhz-and-160mhz-channel-bo The clients are all 802.11n STAs or lower is the likely cause of this behavior. If a WLAN with 100 802.11ac access points is configured to use 80 MHz channels, but only 40 MHz communications are seen in a particular BSS, it means that the clients in that BSS do not support 80 MHz channels. This could be because they are using older standards, such as 802.11n or lower, that do not support 80 MHz channels. Alternatively, they could be using newer standards, such as 802.11ac or ax, but have their channel width settings limited to 40 MHz or lower due to device capabilities or configuration options. In either case, the AP will adapt to the client's channel width and use only 40 MHz of the 80 MHz allocated bandwidth to communicate with them.
This will reduce the potential throughput and efficiency of the WLAN. References: , Chapter 3, page 111; , Section 3.2
NEW QUESTION # 43
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. 10 mW
- B. 25 mW
- C. 250 mW
- D. 50 mW
- E. 1000 mW
Answer: E
NEW QUESTION # 44
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. UL-MU-MIMO
- B. TWT
- C. BSS Color
- D. OFDMA
Answer: B
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 # 45
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. Interference from no-Wi-Fi sources
- B. DoS attack
- C. Interference from other WLANs
- D. Faulty drivers Dos attack
Answer: A
NEW QUESTION # 46
What ID is typically mapped to an AP's MAC address if a single BSS is implemented?
- A. VLAN ID
- B. Device ID
- C. BSSID
- D. SSID
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 # 47
What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?
- A. SIG
- B. TVHT
- C. DMG
- D. DSSS
Answer: D
Explanation:
https://www.cwnp.com/802-11ac-vht-just-the-facts/
NEW QUESTION # 48
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
- A. 104 ms
- B. 400 ns
- C. 10 ms
- D. 800 ns
Answer: B
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 # 49
You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you look for in a protocol analyzers?
- A. Retransmitted frames from multiple STAs at higher rates than other STAs
- B. Frames transmitted from the AP without acknowledgement
- C. Frames with the HN bit set to 1
- D. Frames with the retry bit set to 0
Answer: A
Explanation:
http://setup-wireless.blogspot.com/2008/11/wireless-hidden-node.html
NEW QUESTION # 50
You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of this connection?
- A. 54 Mbps because that is the actual maximum throughput of an 802.11 connection
- B. 150 Mbps because the data rate is equal to the throughput
- C. Less than 150 Mbps because of 802.11 overhead and contention
- D. More than 150 Mbps because of compression
Answer: C
NEW QUESTION # 51
What factor will have the most significant impact on the amount of wireless throughput available to each station within a BSS?
- A. The Layer 3 protocol used by each station to transmit data over the wireless link
- B. The number of client stations associated to the BSS
- C. The presence of co-located (10m away) access points on non-overlapping channels
- D. The power management settings in the access point beacons
Answer: B
NEW QUESTION # 52
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