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無料CWNA-108試験問題CWNA-108実際のリアル試験問題
CWNP CWNA-108認定試験は、ワイヤレスネットワーキングのスキルと知識を向上させたいITプロフェッショナルにとって貴重な資格です。認証はグローバルに認識されており、エンタープライズワイヤレスネットワークの設計、インストール、設定、運用、およびトラブルシューティングに必要なスキルを検証するように設計されています。最新の更新により、CWNA-108試験は、ワイヤレスネットワーキング業界の最新のトレンド、テクノロジー、およびベストプラクティスを反映しており、ワイヤレスネットワーキングで働くITプロフェッショナルにとって不可欠な認証となっています。
CWNP CWNA-108（CWNP認定ワイヤレスネットワーク管理者）認定試験は、ワイヤレスネットワークにおけるスキルと知識を証明するために設計された、世界的に認知された認定資格です。この試験は、WLANハードウェアとソフトウェア、セキュリティ、トラブルシューティング、設計と分析など、広範なトピックをカバーしています。無線ネットワークの設計、実装、管理に関与している個人にとって理想的です。
CWNA-108認証試験は、ワイヤレスLANの設計、インストール、管理、セキュリティとトラブルシューティングなど、ワイヤレスネットワークに関連する幅広いトピックをカバーしています。この試験は、ワイヤレスネットワーキングテクノロジー、プロトコル、および標準に関する知識について候補者をテストするように設計されています。
質問 # 39
When using a spectrum to look for non Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a users workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?
- A. Bluetooth devices in the user's work area
- B. USB 3 devices in the user's work area
- C. Unintentional radiation from the PC power supply
- D. Excess RF energy from a nearby AP
正解：C
質問 # 40
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. Elevator shafts
- B. Narrow hallways
- C. Workspace dividers
- D. RFID chokepoints
- E. Microwave ovens
正解：A、E
質問 # 41
What is the final step in an effective troubleshooting process?
- A. Verify the solution
- B. Document the results
- C. Notify the users of problem resolution
- D. Disable the WLAN
正解：B
解説：
Explanation
The final step in an effective troubleshooting process is to document the results. Documentation is essential for keeping track of the problem history, the actions taken, the solutions implemented, and the outcomes achieved.
Documentation can also help to prevent future problems, improve best practices, and provide feedback for improvement. Documentation should include relevant information such as problem description, symptoms, root cause analysis, resolution steps, verification methods, and lessons learned. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 513; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 483.
質問 # 42
What statement describes the authorization component of a AAA implementation?
- A. Granting access to specific network services or resources according to a user profile.
- B. Verifying that a user is who he says he is.
- C. Validating client device credentials against a database.
- D. Implementing a WIPS as a full-time monitoring solution to enforce policies.
正解：A
解説：
Explanation
Granting access to specific network services or resources according to a user profile describes the authorization component of a AAA implementation. AAA stands for Authentication, Authorization, and Accounting, which are three functions that are used to control and monitor access to network resources and services. Authentication is the process of verifying that a user is who he says he is, by using credentials such as username, password, certificate, token, or biometric data. Authorization is the process of granting access to specific network services or resources according to a user profile, which defines the user's role, privileges, and permissions. Accounting is the process of recording and reporting the usage of network services or resources by a user, such as the duration, volume, type, and location of the access. AAA can be implemented by using different protocols and servers, such as RADIUS, TACACS+, LDAP, Kerberos, or Active Directory. References: 1, Chapter 11, page 449; 2, Section 7.1
質問 # 43
What frame type is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS?
- A. ACK
- B. Beacon
- C. PS-Poll
- D. RTS
正解：D
解説：
Explanation
The frame type that is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS is RTS. RTS stands for Request to Send and is a control frame that is sent by a station to request access to the medium for a specified duration. The RTS frame contains the source and destination MAC addresses, as well as a Network Allocation Vector (NAV) value that indicates how long the medium will be occupied. The destination station responds with a Clear to Send (CTS) frame that echoes the NAV value and grants permission to the source station. All other stations in the BSS hear either the RTS or CTS frame and update their NAV timers accordingly, deferring their transmissions until the medium is free. The RTS/CTS mechanism can be used to prevent hidden node problems, reduce collisions, and protect high data rate frames that use features such as 802.11n or 802.11ac that may not be compatible with legacy stations. ACK, Beacon, and PS-Poll are not used to reserve the medium for high data rate frames. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 112; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 102.
質問 # 44
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
正解：B
解説：
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.
質問 # 45
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 clients are configured to use WPA and 5 GHz channels only support WPA2.
- B. The access points are configured to disallow 5 GHz.
- C. The client drivers are faulty and should be upgraded.
- D. The antennas in the laptop have insufficient gain to detect the 5 GHz signals.
正解：C
解説：
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
質問 # 46
What cause of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries?
- A. Access pointsbroadcasting with too little power
- B. Client stations broadcasting with too much power
- C. Large 802.11 cells with physically distributed stations
- D. Data frames too large for the physical environment
正解：A
質問 # 47
A dual-band 802-1 lac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?
- A. 15.4 W
- B. 12.95 W
- C. 25. 5W
- D. 30 W
正解：C
解説：
Similar to a PoE network switch, the PoE plus switch also supplies power over two pairs, but it adds an additional power class that is able to deliver power up to 25.5W for a PD with a voltage range from
42.5V to 57V. The max power delivered by each port of a PoE+ switch is 30W, along with a voltage range from 50V to 57V.
https://community.fs.com/blog/poe-switch-types.html
https://en.wikipedia.org/wiki/Power_over_Ethernet#:~:text=Class%204%20can%20only%20be%2
0used%20by%20IEEE,0%20device.%20Configuration%20via%20Ethernet%20layer%202%20LL DP
質問 # 48
When implementing PoE, what role is played by a switch?
- A. PSE
- B. PD
- C. Power splitter
- D. Midspan injector
正解：A
解説：
Explanation
PoE stands for Power over Ethernet, which is a technology that allows network devices to receive power and data over the same Ethernet cable. PoE eliminates the need for separate power adapters or outlets for devices such as IP phones, cameras, or APs. PoE requires two types of devices: PSE (Power Sourcing Equipment) and PD (Powered Device). A PSE is a device that provides power to the Ethernet cable, such as a switch, injector, or splitter. A PD is a device that receives power from the Ethernet cable, such as an IP phone, camera, or AP. When implementing PoE, a switch plays the role of a PSE910. References: CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 293; CWNA-108 Study Guide, Chapter 7: Power over Ethernet (PoE), page 287.
質問 # 49
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 sec the activity that it is generating. What common spectrum analyzer view should you use for this analysis?
- A. Clients
- B. APs
- C. Waterfall/Spectrogram
- D. Real-Time FFT
正解：C
質問 # 50
What statements about the beamwidth of an RF antenna are true?
- A. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.
- B. Vertical beamwidth is displayed (in degree) on the antenna's Azimuth chart.
- C. Horizontal and vertical beamwidth are calculated at the points in which the main lobe decreases power by 3 dB
- D. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
正解：C
質問 # 51
When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?
- A. Each AP responds in turn after preparing a probe response and winning contention.
- B. Each AP checks with the DHCP server to see if it can respond and then acts accordingly.
- C. For each probe request frame, only one AP may reply with a probe response.
- D. After waiting a SIFS, all APs reply at the same time with a probe response.
正解：A
解説：
Explanation
A probe request frame is a management frame that is sent by a client station to discover available wireless networks in its vicinity. A probe request can be either unicast or broadcast, depending on whether it specifies a particular SSID (Service Set Identifier) or a wildcard SSID. A broadcast probe request with a wildcard SSID is used to solicit responses from all APs within range, regardless of their SSIDs. Each AP that receives a broadcast probe request prepares a probe response frame that contains information about its network, such as SSID, supported rates, channel, security, etc. However, before sending the probe response, each AP must contend for the medium using the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol, which is the basic access method for 802.11 WLANs. This means that each AP must sense the channel for a DIFS (Distributed Interframe Space) interval, which is longer than a SIFS interval, and then generate a random backoff time before transmitting. This reduces the probability of collisions and ensures fair access to the medium among multiple APs. Therefore, each AP responds in turn after preparing a probe response and winning contention . References: [CWNA-109 Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 215; [CWNA-108 Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 209;
[CWNA-109 Study Guide], Chapter 6: Wireless LAN Devices and Topologies, page 255.
質問 # 52
As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an area. What term describes the rate at which this expansion happens?
- A. Ohm's law
- B. Inverse square law
- C. Fresnel zone thinning
- D. MU-MIMO
正解：B
質問 # 53
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. 802.11 bridging to the response team headquarters
- C. Temporary wired DSL
- D. Turn up the output power of the WLAN at the response team headquarters
正解：A
解説：
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
質問 # 54
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. 15.4 W
- B. 12.95 W
- C. 25.5 W
- D. 30 W
正解：C
質問 # 55
You are managing a wireless access point in autonomous mode using the Web based interface. You capture traffic during this management task and notice that you can see the HTML code of the Web pages used for access point management. What error in administration could be the cause of this security concern?
- A. HTTP is in use instead of HTTPS
- B. WPA2 is disabled on the WLAN
- C. A VPN with the AP is not established
- D. IPsec is not in use of the management connection as recommended
正解：A
解説：
Explanation
The error in administration that could be the cause of this security concern is that HTTP is in use instead of HTTPS. HTTP is an unencrypted protocol that transfers data in plain text over the network. This means that anyone who captures the traffic can see the HTML code of the Web pages used for access point management, as well as any sensitive information such as passwords or configuration settings. HTTPS is an encrypted protocol that uses SSL/TLS to secure the data transmission between the Web browser and the Web server.
HTTPS prevents anyone from snooping on or tampering with the Web traffic. Therefore, HTTPS should always be used for Web based management of wireless access points, especially in autonomous mode where there is no centralized controller to enforce security policies. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 431; [HTTP vs HTTPS: What's The Difference And Why Should You Care?].
質問 # 56
A Wi-Fi Alliance interoperability certificate indicates that a device is a/b/g/n certified. It further indicates one transmit and receive spatial stream for both the 2.4 GHz and 5.0 GHz bands. It further indicates support for both WPA and WPA2 Enterprise and Personal. Finally, it indicates support for EAP-TLS, EAP-TTLS/MSCHAPv2, PEAPv0/EAP-MSCHAPv2 and PEAPv1/EAP- GTC.
Which one of the following statements is false?
- A. This client device supports protection mechanisms such as RTS/CTS and/or CTS-to-Self.
- B. This client device supports both TKIP and CCMP cipher suites.
- C. 300 Mbps is the maximum supported data rate for this device.
- D. This client device supports X.509 certificates for EAP authentication.
- E. This client device supports the ERP, OFDM, and HT physical layer specifications.
正解：C
質問 # 57
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