2023年最新の実際に出るCWNA-108問題集には試験のコツがあるPDF試験材料
心強いCWNA-108PDF問題集はCWNA-108問題
質問 # 48
What is an advantage of using WPA2-Personal instead of WEP-128 as a security solution for
802.11 networks?
- A. WPA2-Personal uses dynamic encryption keys, and WEP-128 uses static keys
- B. WPA2-Personal uses CCMP for encryption, and WEP-128 uses TKIP for encryption
- C. WPA2-Personal uses 802.1X/EAP for authentication, and WEP-128 uses preshared keys
- D. WPA2-Personal is based on IEEE 802.11 industry standards, but WEP is not
正解：A
質問 # 49
In addition to coverage analysis results, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?
- A. Layer 4 protocol availability analysis results
- B. Capacity analysis results
- C. WAN interface analysis results
- D. Application Layer protocol availability analysis results
正解：B
解説：
Explanation
In addition to coverage analysis results, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance is Capacity analysis results. Capacity analysis is a method of testing the ability of the WLAN to support the expected number and type of users, devices, and applications. Capacity analysis can help to determine the optimal number and placement of access points, the appropriate channel and power settings, the required QoS policies, and the expected throughput and latency levels. Capacity analysis results can help to verify that the WLAN meets the performance requirements and service level agreements (SLAs) of the organization. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 548; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 518.
質問 # 50
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. Create a plan of action or escalate the problem
- B. Discover the scale of the problem
- C. Perform corrective actions
- D. Verify the solution
正解：B
解説：
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
質問 # 51
What best describes WPA2 in relation to 802.11 wireless networks?
- A. WPA2 is the standard that defines security for WLANs.
- B. WPA2 is specified in the 802.11 standard as implementing CCMP/AES.
- C. WPA2 is the second version of WPA and it enhances security through the use of TKIP instead of WEP.
- D. WPA2 is a certification created by the Wi-Fi Alliance that validates devices correctly implement CCMP/ AES.
正解：A
質問 # 52
Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even when the two APs are operating on non-overlapping channels (e.g. 1 & 6).
What deployment flaw could cause this problem?
- A. The access points are mounted too closely to one another.
- B. The access points are not synchronized to the same NTP server.
- C. A client station is using active scanning to probe for access points on multiple channels.
- D. Reflective objects in the area are causing significant multipath.
正解：A
質問 # 53
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
正解：D
解説：
Explanation
質問 # 54
You are evaluating access points for use in the 5GHz frequency band.
What PHY supports this band and supports 80 MHz channels?
- A. ERP
- B. OFDM
- C. HT
- D. VHT
正解：D
質問 # 55
What standard is referenced in the 802.11-2016 specification and is recommended for robust WLAN client security?
- A. SSID hiding
- B. WEP
- C. 802.1X/EAP
- D. IPSec VPN
正解：C
質問 # 56
A WLAN is implemented using wireless controllers. The APs must locate the controllers when powered on and connected to the network. Which one of the following methods is commonly used to locate the controllers by the APs?
- A. DHCP
- B. GRE
- C. SNMP
- D. NTP
正解：A
質問 # 57
What statement about the IEEE 802.11e QoS facility is true?
- A. Four 802.1p user priorities are mapped to eight 802.11 transmit queues.
- B. When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.
- C. 802.11 control frames are assigned to the 802.11 EF priority queue.
- D. 802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.
正解：D
質問 # 58
The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The users indicate that they need more throughput and all stations are 5 GHz capable 802.11ac clients. The current AP configuration uses 20 MHz channels in both 2.4 GHz and 5 GHz. What is the least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended?
- A. Use a 40 MHz channel on the 5 GHz radio
- B. Install a second AP in the coverage area
- C. Use a 40 MHz channel on the 2.4 GHz radio
- D. Use a 160 MHz channel on the 5 GHz radio
正解：A
解説：
Explanation
The least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended is to use a 40 MHz channel on the 5 GHz radio. This solution can double the channel bandwidth and increase the data rates for the 5 GHz capable 802.11ac clients. Using a
40 MHz channel on the 5 GHz radio is also less likely to cause co-channel interference or overlap with other channels than using a 40 MHz channel on the 2.4 GHz radio, which has only three non-overlapping channels.
Using a 160 MHz channel on the 5 GHz radio may provide even higher throughput, but it may also consume too much of the available spectrum and cause more interference with other devices or networks. Installing a second AP in the coverage area may also improve the throughput, but it may require additional costs and configuration. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 216; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 206.
質問 # 59
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. Site survey utility
- B. Spectrum analyzer
- C. WLAN scanner tool
- D. Protocol analyzer
正解：C
質問 # 60
What factor is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS?
- A. Implementation Fast BSS Transition (FT) for roaming
- B. Implementation of several other clients in the same BSS using 802.11g radios.
- C. Increasing or decreasing the number of spatial streams in use by the client station and AP
- D. RF interference from more than 10 nearby Bluetooth transmitters
正解：A
解説：
https://www.networkcomputing.com/wireless-infrastructure/wifi-fast-roaming-simplified
質問 # 61
The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).
What is the center frequency of channel 4?
- A. 2.417 GHz
- B. 2.422 GHz
- C. 2.427 GHz
- D. 2.413 GHz
正解：C
質問 # 62
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
正解：D
解説：
Explanation
Shared Key Authentication is a security solution that was defined in the original 802.11 standard as an alternative to Open System Authentication, which does not provide any security at all. Shared Key Authentication uses WEP (Wired Equivalent Privacy) to encrypt and authenticate data frames between the client station and the AP. However, WEP has been proven to be extremely vulnerable to various attacks that can easily crack the encryption key and compromise the network security. Therefore, Shared Key Authentication is deprecated in the 802.11 standard and should never be used in any modern WLAN deployment . References: [CWNA-109 Study Guide], Chapter 10: Wireless LAN Security, page 401;
[CWNA-108 Study Guide], Chapter 10: Wireless LAN Security, page 391; [Wikipedia], Wired Equivalent Privacy.
質問 # 63
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 invalid because the AP will compress all data before transmitting it onto the Ethernet link.
- B. His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
- C. 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 .
- D. His concern is valid and the company should upgrade all Ethernet link to 10 Gbps immediately.
正解：C
解説：
https://blogs.cisco.com/wireless/deploying-testing-and-tuning-802-11ac
質問 # 64
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.
正解：B
質問 # 65
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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。
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