[2023年11月29日] 完全版最新のCWNA-108問題集で100%カバー率問題と解答があなたをリアル試験で合格させる
最新CWNA-108試験問題集で有効最新の問題集
CWNA-108試験はベンダー中立認証プログラムであるため、特定のワイヤレスベンダーに結び付けられていないことを意味します。この認定プログラムは、ワイヤレステクノロジーの知識を広げ、専門知識を認識したい専門家に最適です。 CWNA-108認定プログラムは、より高度なワイヤレス認定を追求したい専門家の足がかりです。
CWNA-108認定は、ワイヤレスネットワーキングでキャリアを進めようとしているITプロフェッショナルに最適なエントリーレベルの認定です。認定試験では、ワイヤレスLANの設計と展開、ワイヤレスLANセキュリティ、トラブルシューティング、管理など、幅広いトピックをカバーしています。
CWNA-108認証試験では、ワイヤレスネットワークアーキテクチャ、ワイヤレスLANセキュリティ、RFテクノロジー、アンテナの概念、WLANトラブルシューティング、ネットワーク管理など、幅広いトピックをカバーしています。この認定は、ネットワークエンジニア、ネットワーク管理者、ワイヤレスサポートスペシャリストなど、ワイヤレスネットワークの管理、維持、トラブルシューティングを担当するITプロフェッショナルに適しています。これは、ワイヤレスネットワーキングの専門知識を証明し、この分野でのキャリアの見通しを強化する優れた方法です。
質問 # 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. DSSS
- C. TVHT
- D. DMG
正解：B
解説：
https://www.cwnp.com/802-11ac-vht-just-the-facts/
質問 # 48
You have been tasked with creating a wireless link between two buildings on a single campus. The link must support at least 150 Mbps data rates. What kind of WLAN technology role should you deploy?
- A. WPAN
- B. Wireless bridging
- C. Access BSS
- D. IBSS
正解：B
解説：
Explanation
https://www.wlanmall.com/what-is-a-wireless-bridge/
Wireless bridging is a WLAN technology role that allows two or more networks to be connected wirelessly over a distance. A wireless bridge consists of two or more APs that are configured to operate in bridge mode and use directional antennas to establish a point-to-point or point-to-multipoint link. Wireless bridging can support high data rates and is suitable for scenarios where running cables is impractical or expensive. To create a wireless link between two buildings on a single campus that supports at least 150 Mbps data rates, wireless bridging is an appropriate solution678. References: CWNA-109 Study Guide, Chapter 6: Wireless LAN Devices and Topologies, page 271; CWNA-108 Study Guide, Chapter 6: Wireless LAN Devices and Topologies, page 265; Wi-Fi Wireless Bridging Explained.
質問 # 49
When an ACK frame is not received by the transmitting STA, what is assumed?
- A. The frame was not delivered and must be retransmitted
- B. The receiver is offline
- C. The receiver processed the frame, but did not respond with an ACK frame because 802.11w is enabled
- D. The frame was correctly delivered
正解：A
解説：
Explanation
An ACK (Acknowledgement) frame is a short control frame that is sent by the receiver of a data or management frame to confirm that the frame was received correctly. The ACK frame is sent after a SIFS (Short Interframe Space) interval, which is the shortest time gap between frames in 802.11. If the transmitter does not receive an ACK frame within a specified time, it assumes that the frame was not delivered and must be retransmitted. This is part of the 802.11 reliability mechanism that ensures reliable data delivery over an unreliable wireless medium . References: [CWNA-109 Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 209; [CWNA-108 Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 203.
質問 # 50
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. 1000 mW
- B. 2 W
- C. 250 mW
- D. 500 mW
正解：A
質問 # 51
Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?
- A. Patch and panel
- B. Grid and sector
- C. Dish and grid
- D. Dipole and yagi
正解：D
質問 # 52
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. Workspace dividers
- C. Microwave ovens
- D. RFID chokepoints
- E. Elevator shafts
正解：C、E
質問 # 53
You manage a WLAN with 100 802.1lac 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. The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
- B. The short guard interval is also enabled
- C. The clients are all 802.11n STAs or lower
- D. All clients implement single spatial stream radios
正解：A
質問 # 54
A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-802.11 device?
- A. Laptop-based spectrum analyzer with a directional antenna
- B. Laptop-based protocol analyzer with an omni-directional antenna
- C. Access point spectrum analyzer
- D. Laptop-based spectrum analyzer with an omni-directional antenna
正解：C
質問 # 55
You are troubleshooting an issue reported by several wireless users. The problem is contained to one cell (several users connected to the same AP). You manage the WLAN and no other network devices. After analysis it appears to be a switch problem. What action should be taken?
- A. Document the results and close the case
- B. Escalate the problem to the wireless vendor support staff
- C. Create a plan of action and implement it
- D. Escalate the problem to the network administration team
正解：D
質問 # 56
What primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?
- A. Signal strength of AP beacons received.
- B. FCS errors in frames transmitted to and from the AP.
- C. Throughput speed in Mbps.
- D. PING latency when testing against an Internet server.
正解：A
解説：
Explanation
When a station scans for available wireless networks, it listens for beacon frames sent by APs. A beacon frame contains information about the BSS, such as SSID, supported rates, channel, security, etc. The station also measures the signal strength of the beacon frames, which indicates how well the station can communicate with the AP. The signal strength is usually expressed in dBm or RSSI units. The higher the signal strength, the better the connection quality and performance. Therefore, the station can use the signal strength of AP beacons as the primary metric to select the best AP for connectivity to the desired BSS12. References: CWNA-109 Study Guide, Chapter 6: Wireless LAN Devices and Topologies, page 249; CWNA-108 Study Guide, Chapter
6: Wireless LAN Devices and Topologies, page 243.
質問 # 57
What factors does not influence the distance at which an RF signal can be effectively received?
- A. Transmitting station's output power
- B. Receiving station's output power
- C. Free Space Path Loss
- D. Receiving station's radio sensitivity
正解：A
質問 # 58
In a WALN security, what authentication method always creates Layer2 dynamic encryption keys?
- A. EAP-TLS
- B. Shared Key
- C. HTTPS captive portal
- D. WEP
正解：D
質問 # 59
A client complains of low data rates on his computer. When you evaluate the situation, you see that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an 802.11ac client and connects to an 802.11acAP. Both the client and AP are 2x2:2 devices.
What is the likely cause of the low data rate issue?
- A. CAT5e cabling run to the AP
- B. Lack of support for 802.11n
- C. Too few spatial streams
- D. Weak signal strength
正解：D
質問 # 60
What best describes WPA2 in relation to 802.11 wireless networks?
- A. WPA2 is the second version of WPA and it enhances security through the use of TKIP instead of WEP.
- B. WPA2 is the standard that defines security for WLANs.
- C. WPA2 is specified in the 802.11 standard as implementing CCMP/AES.
- D. WPA2 is a certification created by the Wi-Fi Alliance that validates devices correctly implement CCMP/ AES.
正解：B
質問 # 61
ABC Company has just purchased a 6 dBi patch antenna. After performing some tests with the 6 dBi antenna, they have concluded that more antenna gain is needed to cover their outdoor courtyard. When choosing an antenna with higher gain, what other antenna characteristic will also always change?
- A. Impedance
- B. Fresnel Zone size
- C. Beamwidth
- D. Maximum input power
- E. VSWR Ratio
正解：C
質問 # 62
A non-802.11 device is suspected of causing interference on the WLAN. You are not certain of the location or type of device. What is the best solution for locating this non-802.11 device?
- A. Laptop-based spectrum analyzer with a directional antenna
- B. Laptop-based spectrum analyzer with an omni-directional antenna
- C. Access point spectrum analyzer
- D. Laptop-based spectrum analyzer with an omni-directional antenna
正解：A
解説：
Explanation
A laptop-based spectrum analyzer with a directional antenna is the best solution for locating a non-802.11 device that is suspected of causing interference on the WLAN. A spectrum analyzer is a device or a software application that can measure and display the frequency spectrum of electromagnetic signals in a given range.
A spectrum analyzer can show the amplitude, frequency, bandwidth, modulation, and other characteristics of different signals in the spectrum, which can help identify their sources and types. A spectrum analyzer can also detect non-802.11 devices that may cause interference on the WLAN, such as microwave ovens, cordless phones, Bluetooth devices, or radar systems. A laptop-based spectrum analyzer is a software application that runs on a laptop computer and uses an external USB adapter as its RF interface. A laptop-based spectrum analyzer has the advantage of being portable, flexible, and cost-effective compared to a hardware-based spectrum analyzer. A directional antenna is an antenna that radiates or receives RF signals more strongly in one direction than in others. A directional antenna has a high gain and a narrow beamwidth, which means it can focus the RF energy in a specific direction and reduce the interference from other directions. A directional antenna can also increase the range and sensitivity of the RF signal detection. To locate a non-802.11 device that is causing interference on the WLAN, a laptop-based spectrum analyzer with a directional antenna can be used to perform a technique called RF hunting or triangulation. This technique involves pointing the directional antenna in different directions and observing the signal strength and characteristics of the interfering device on the spectrum analyzer. By moving around and changing the direction of the antenna, the location of the interfering device can be estimated based on where the signal strength is highest and most consistent. References: 1, Chapter 7, page 282; 2, Section 4.3
質問 # 63
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. Power save mode of clients
- B. Secondary channel offset
- C. RIFS mode
- D. Non-ERP Present field
- E. HT Protection mode
正解：C、E
解説：
4. RIFS Mode ( 1 bit)
Indicates whether the use of reduced interframe space is permitted within the BSS. RIFS can be used only when a HT Greenfield network is in place.
0 - RIFS is prohibited
1- RIFS is permitted
5. HT Protection
Indicates protection requirements of HT transmissions.
0 - no protection mode (Green Field mode)
1 - nonmember protection mode
2 - 20 MHz protection mode
3- non-HT mixed mode
https://mrncciew.com/2014/11/04/cwap-ht-operations-ie/
質問 # 64
What term describes the effect of increasing the intensity of an RF wave with an antenna by focusing the energy in a specific direction?
- A. Active Amplification
- B. Distributed Radiation
- C. Beam Compression
- D. RF Flooding
- E. Passive Gain
正解：E
質問 # 65
An IEEE 802.11 amendment is in the draft state. What impact does this draft amendment have on the 802.11 standard?
- A. The standard is changed to reflect the new capabilities as soon as amendment enters the draft stage.
- B. Devices will be released based on the draft amendment and the draft amendment features are part of the standard.
- C. No impact: Draft amendments do not become part of the standard until a working group is formed.
- D. No impact: Until an amendment is ratified, it does not become part of the standard.
正解：D
質問 # 66
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 stations to enter sleep mode and legacy Power Save does not.
- B. Legacy Power Save mode was removed in the 802.11ac amendment.
- C. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.
- D. VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.
正解：C
解説：
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
質問 # 67
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