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完全版CWISA-102練習テスト69特別な問題と解答が待ってます！今すぐゲットせよ！
質問 # 31
Among these choices, what is the most common reason administrators use scripting during the deployment of a wireless solution?
- A. To reduce configuration errors
- B. To increase the signal strength of the resulting wireless links
- C. To provide time for playing solitaire
- D. To enhance the capabilities of the resulting solution
正解：A
解説：
Automation for Consistency: Scripts eliminate the potential for human error during repetitive configuration tasks on multiple devices. This ensures uniformity across the wireless solution.
Speed and Efficiency: Scripts can be much faster than manual configuration, particularly in large deployments.
Other Benefits: While scripts might aid signal strength (e.g., optimizing settings) or enhance solution capabilities, their core value in configuration is reducing errors.
References:
Network Automation: Benefits of using scripts for configuration management.
Configuration Management Best Practices: Emphasize the importance of consistency and repeatability.
質問 # 32
You are creating documentation for a new wireless solution that is deployed in the organization. Why is it important to document APIs in use within the system?
- A. The APIs in use will not function without this documentation. The documentation is linked to the executable process of the APIs.
- B. It allows future support to implement APIs that have not been used at the time of deployment.
- C. If APIs are in use, it typically indicates the use of custom scripts or application code. Future support will be easier when the APIs in use are documented.
- D. If APIs are in use, it typically indicates that the vendor has not provided ideal support. Without documentation, you cannot prove this reality for a discount.
正解：C
解説：
Customization and Integrations: The presence of APIs often suggests a system is integrated with other platforms or has custom-built elements.
Understanding Dependencies: Documenting used APIs helps clarify how different parts of the system interact and where potential issues might arise.
Troubleshooting Efficiency: Detailed API documentation aids in resolving problems, allowing staff to assess interconnected systems effectively.
Knowledge transfer: Future support teams won't have to reverse-engineer the system; documentation ensures smooth handover and understanding.
References:
Best practices API documentation: Guides on API documentation formats and the level of detail needed for maintenance. [Example: Swagger, OpenAPI Specification] (https://swagger.io/) Software Development Life Cycle (SDLC): Materials emphasizing the importance of documentation during development and support phases.
質問 # 33
How does OFDMA differ from OFDM?
- A. OFDMA offers greater range by using multiple channels at once
- B. OFDMA allows multiple devices to transmit simultaneously on the same frequency
- C. OFDMA uses multiple radios to achieve higher throughput
- D. Subcarriers of OFDMA can contain data destined for a different receiver
正解：B
解説：
OFDM vs. OFDMA:
OFDM (Orthogonal Frequency-Division Multiplexing): Divides a channel into multiple subcarriers for data transmission.
OFDMA (Orthogonal Frequency-Division Multiple Access): Extends OFDM by allowing multiple users to share subcarriers simultaneously, improving efficiency and spectral utilization.
References
OFDM: https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDMA: https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiple_access
質問 # 34
What process, used for security in wireless solutions, is defined as the encoding of information to prevent readability by unauthorized users?
- A. Authentication
- B. Encryption
- C. Access Control
- D. Authorization
正解：B
解説：
Encryption vs. Other Options:
Access Control: Limits who can access data, but doesn't make it unreadable.
Authentication: Validates user/device identity, but not focused on data confidentiality.
Authorization: Determines the actions a user is allowed, separate from securing the data itself.
How encryption works: Encryption uses algorithms and keys to turn plaintext into unreadable ciphertext. Only those with the correct key can decrypt it.
Data in motion vs. data at rest: Encryption protects sensitive information both when transmitted over the wireless network and when stored on devices.
References:
Encryption standards and protocols: Resources on common wireless encryption types (WPA2, WPA3, TLS) and their implementation.
質問 # 35
You are planning a wireless implementation. At what point should you begin to consider security requirements for the implementation?
- A. During hand-off to support
- B. In the planning phase
- C. In the implementation phase
- D. In the acceptance testing phase
正解：B
解説：
Security by Design: Security should be a fundamental consideration from the initial planning stages of any wireless implementation. This ensures:
Risk Assessment: Identifying potential vulnerabilities early on.
Security Controls: Choosing appropriate encryption, authentication, and access control mechanisms.
Integration: Security measures are seamlessly woven into the system's architecture, not retrofitted later, which can be less effective.
質問 # 36
When deploying devices in an indoor manufacturing environment, which IP rating is more likely to be required?
- A. IP38
- B. IP47
- C. IP46
- D. IP66
正解：D
解説：
IP Ratings & Manufacturing: IP66 provides:
Dust-tight: (First '6') Complete protection against dust ingress.
Powerful Water Jets: (Second '6') Protection against strong water jets from any direction.
Harsh Manufacturing Environments: IP66 is common due to dust, dirt, and potential exposure to liquids during cleaning or spills.
References
IP Ratings: https://en.wikipedia.org/wiki/IP_Code
質問 # 37
You have implemented a wireless mesh network. All mesh nodes are properly configured for participation in the same mesh network. Several of the mesh nodes are unable to connect to other mesh nodes. What action may provide a solution to this problem?
- A. Place the faulty mesh nodes in their own mesh network
- B. Move the faulty mesh nodes to provide for better signal strength
- C. Change the security settings on the faulty mesh nodes
- D. Change the output power settings only on the faulty mesh nodes
正解：B
解説：
Mesh Connectivity Depends on Signal: Mesh nodes relay data for each other. Weak signal strength between nodes can disrupt connectivity throughout the network.
Troubleshooting Signal Issues: Physically relocating affected nodes can improve their ability to form stable connections with other nodes in the mesh.
Why Other Options May Not Help:
Separate Mesh: Splits the network, not solving the root connectivity issue Output Power: May help marginally, but significant improvement is typically achieved through repositioning.
Security Settings: Unlikely to cause connectivity issues between properly configured nodes in the same mesh.
References:
Wireless Mesh Network Troubleshooting: Guides addressing signal strength and coverage concerns.
RF Site Survey Tools: Resources on software that can help visualize signal strength and aid in node placement.
質問 # 38
What modulation is used by LoRa?
- A. ASK
- B. OFDM
- C. OFDMA
- D. CSS
正解：D
解説：
LoRa Modulation: LoRa (Long Range) is a proprietary wireless technology that utilizes Chirp Spread Spectrum (CSS) modulation.
CSS Characteristics:
Spread spectrum technique for resilience against interference.
Chirps (frequency sweeps) enable operation below the noise floor for long range.
References
LoRa: https://en.wikipedia.org/wiki/LoRa
Chirp Spread Spectrum (CSS): https://en.wikipedia.org/wiki/Chirp_spread_spectrum
質問 # 39
What organization maintains and publishes the 802.15.4 Standard?
- A. IEEE
- B. Zigbee Alliance
- C. IETF
- D. Bluetooth SIG
正解：A
解説：
IEEE 802.15.4: The IEEE 802.15.4 standard is a fundamental specification for low-rate wireless personal area networks (LR-WPANs). It serves as the basis for many wireless IoT protocols.
IEEE's Role: The Institute of Electrical and Electronics Engineers (IEEE) is the organization responsible for creating, maintaining, and publishing the 802.15.4 standard.
References
IEEE 802.15.4 Standard: https://standards.ieee.org/standard/802_15_4-2020.html IEEE Website: https://www.ieee.org/
質問 # 40
What consideration is found in PtMP systems that is not found in PtP systems?
- A. SINR optimization
- B. Airtime management
- C. Frequency selection
- D. Interference avoidance
正解：B
解説：
PtMP (Point-to-Multipoint): A single access point (AP) communicates with multiple client devices. This means the AP needs to manage how the available airtime is shared among those clients.
Airtime Fairness: Mechanisms are needed to ensure that:
Each client gets a fair chance to communicate
High-priority traffic isn't starved by low-priority traffic
PtP (Point-to-Point): A dedicated link only has two devices, eliminating the need for complex airtime management.
Considerations in Both: While interference, SINR, and frequency selection are important in both PtMP and PtP systems, the need for airtime management is unique to the multipoint scenario.
References:
Wireless Network Topologies (PtP vs. PtMP): References of the differences in how communication is managed in each scenario.
TDMA (Time Division Multiple Access): A common airtime sharing method used in PtMP systems.
質問 # 41
What metric is used to express a relative increase or decrease in signal strength?
- A. W
- B. dBm
- C. mW
- D. dB
正解：D
解説：
Decibel (dB): A logarithmic unit expressing ratios of power or signal strength. It's used in RF contexts due to the wide range of signal levels encountered.
Examples:
dBm: Decibels relative to one milliwatt (power measurement).
dBi: Decibels relative to an isotropic antenna (antenna gain).
References
Decibel: https://en.wikipedia.org/wiki/Decibel
質問 # 42
In the simplified three-layer model for wireless IoT, what is the universal primary function of the Perception layer?
- A. Decrypting local data to send across the unencrypted IoT network
- B. Providing the network across which data can be transmitted to the cloud
- C. Analyzing data for actions and reporting using AI and ML
- D. Gathering and transmitting data to be used for actions, analysis or reporting
正解：D
解説：
Perception Layer: The foundation of an IoT system, it consists of sensors and actuators that:
Sense: Collect data about the environment or object being monitored.
Actuate: Potentially make changes based on commands (e.g., a smart valve opening/closing).
Transmit: Send gathered data to upper layers for processing.
質問 # 43
What is the typical range of a wireless body area network (WBAN)?
- A. 10 centimeters
- B. 10 square meters
- C. 10 meters
- D. 1-2 meters
正解：D
解説：
WBAN Range: Wireless Body Area Networks (WBANs) specialize in short-range communication around the human body. Typical ranges fall within 1-2 meters.
Purpose: This range is designed to:
Connect sensors monitoring health metrics.
Transmit data to a central coordinator device (e.g., smartphone).
Minimize interference potential with other wireless networks.
References
WBAN Overview: https://en.wikipedia.org/wiki/Body_area_network
WBAN Research Paper (Check Range Discussion): https://www.mdpi.com/2224-2708/11/4/67
質問 # 44
What advantage is provided by using an NTP server within a wireless solution architecture?
- A. It provides for name resolution for older network devices
- B. It ensures security through AES encryption
- C. It provides for semi-automatic IP addressing in wireless sensor networks
- D. It ensures uniform, synchronized time among devices
正解：D
解説：
Importance of Time Sync in IoT: Coordinated actions, accurate data analysis, and event logging in wireless IoT solutions often rely on devices having a shared time reference.
NTP's Role: Network Time Protocol (NTP) enables devices to synchronize their clocks against a reliable time source (NTP server), ensuring consistency across the network.
Why Other Options Don't Fit:
IP Addressing: Usually handled by DHCP, not NTP.
Encryption: SSL/TLS secure data in transit, not related to timekeeping.
Name Resolution: Purpose of DNS, not NTP.
References:
Network Time Protocol (NTP): How it works and its importance in distributed systems.
IoT Time Synchronization Challenges: Articles highlighting the need for accuracy in sensor networks and similar use cases.
質問 # 45
What is the primary difference between LoRa and LoRaWAN
- A. LoRa is the Physical Layer and LoRaWAN is the Transport Layer
- B. LoRa is the modulation method (using CSS modulation at the Physical Layer) and LoRaWAN is the MAC sub-layer of the Data Link layer
- C. LoRa uses RF and LoRaWAN uses light-based communications
- D. LoRa is used for communicating across the Internet and LoRaWAN is used only on the local link
正解：B
解説：
LoRa: This refers to the underlying radio modulation technique using Chirp Spread Spectrum (CSS). It defines how data is physically encoded onto the wireless signal.
LoRaWAN: This is the network protocol built on top of LoRa. It manages device communication, network topology, and aspects like security. It operates at the MAC sublayer of the Data Link layer (Layer 2) of the OSI model LoRa vs. LoRaWAN: Key takeaway is that LoRa is the physical layer technology, while LoRaWAN adds the networking layer for management.
References:
LoRa Modulation: Technical explanations of Chirp Spread Spectrum (CSS).
LoRaWAN Specification: Official documentation detailing the network architecture and MAC layer functions.
OSI Model: Descriptions of the Data Link layer and its role in networking.
質問 # 46
Key performance indicators and business requirements are most relevant to what operational activity for an existing wireless IoT solution?
- A. Monitoring
- B. Upgrading
- C. Removal
- D. Implementation
正解：A
解説：
KPI alignment: Key Performance Indicators (KPIs) define success metrics for the wireless IoT solution (e.g., uptime, device responsiveness, data accuracy). Continuous monitoring tracks performance against these KPIs.
Meeting Business Needs: Monitoring ensures the solution delivers the intended value. Are response times fast enough? Are business processes supported effectively?
Proactive maintenance: Monitoring can reveal performance issues before they become critical failures, allowing for proactive fixes.
Optimization: Monitoring data over time helps identify areas for fine-tuning the solution to further align with business requirements.
References
Wireless IoT monitoring tools: Vendor documentation or articles on specific tools and the KPIs they can track.
ITIL (Information Technology Infrastructure Library): Frameworks emphasizing monitoring and continuous improvement.
質問 # 47
What is the spacing between ZigBee channels when operating in the 2.4 GHz frequency band?
- A. 5 MHz
- B. 2 MHz
- C. 1 MHz
- D. 25 MHz
正解：A
解説：
ZigBee Channel Spacing: ZigBee channels in the 2.4 GHz band are spaced 5 MHz apart. This helps manage interference in the crowded 2.4 GHz spectrum.
質問 # 48
You are defining capacity for a wireless solution. What is the most important factor related to each use case defined in relation to capacity?
- A. Support for mobility
- B. Total airtime utilization
- C. Number of devices
- D. Protocols used on each device
正解：C
解説：
Capacity Planning: The number of devices a wireless network can support is the primary determinant of its required capacity. This is because:
Traffic Load: Each device generates network traffic that contributes to the overall load.
Resource Sharing: Devices compete for airtime and bandwidth resources.
Device Type: Requirements vary; a simple sensor has different needs than a video camera.
質問 # 49
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