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CWNP Certified Wireless IoT Solutions Administrator 認定 CWISA-102 試験問題 (Q26-Q31):
質問 # 26
What is a fundamental structural feature of JSON? (Choose the single best answer.)
- A. It Is a compressed data structure optimized for low bandwidth applications
- B. It is a data structure stored in MySQL databases for configuration management
- C. It is a plaintext data structure that consists of free-form Key:Value pairs
- D. It is an encrypted data structure optimized for secure applications
正解：C
解説：
JSON Fundamentals: JSON (JavaScript Object Notation) is a text-based format for representing data in a structured, yet flexible way. Its key features are:
Key-Value Pairs: Information is organized as "key":"value" pairs, making it human-readable.
Plaintext: JSON is not encrypted, ensuring easy parsing across different systems.
JSON vs. Other Options
Not Encrypted: Security must be handled at a higher layer if needed.
Not Optimized for Databases: While JSON can be stored in databases, it's designed for data exchange, not database structure.
Not Inherently Compressed: Compression can be used with JSON, but it's not a core feature.
References:
JSON Introduction: Clear definitions and examples of its syntax. (e.g., https://www.json.org/json-en.html) JSON Data Structures: References of how arrays and nested objects are handled within JSON.
質問 # 27
What best describes the area covered or connected by a WWAN?
- A. In-building
- B. Campus
- C. City
- D. Region
正解：D
解説：
WWAN (Wide-Area Wireless Network): WWANs provide connectivity over extensive geographic areas, typically covering regions or even entire countries.
Cellular Technology: WWANs often rely on cellular networks (3G, 4G, 5G) offered by mobile carriers.
References
WWAN: https://en.wikipedia.org/wiki/Wireless_wide_area_network
質問 # 28
You are performing an implementation for a cloud-based wireless solution. How is connectivity to the cloud established? (Choose the single best answer.)
- A. Through cellular Internet connections only
- B. Through the use of IPX/SPX routers
- C. Through any Layer 3 network connected to the Internet
- D. Through BLE Layer 2 connections that do not use IP
正解：C
解説：
Cloud Connectivity Relies on IP: Most cloud-based services operate via the internet, which utilizes Internet Protocol (IP) at Layer 3 of the network model.
Flexibility: Various Layer 2 technologies (Ethernet, Wi-Fi) can connect to a Layer 3 network that ultimately provides Internet access BLE Exception: Bluetooth Low Energy can have cloud connectivity, but often through gateways and not as a direct Layer 2 connection.
Eliminating Incorrect Options: IPX/SPX is an outdated protocol, and cellular is only one possible way to achieve Internet access.
References:
OSI Model: Descriptions of Network Layers, especially Layer 2 (Data Link) and Layer 3 (Network).
Cloud Architecture: Diagrams showing how devices commonly access cloud resources through internet-based infrastructures.
質問 # 29
You are troubleshooting a problem with a wireless solution that uses MQTT where the IoT end devices are not reporting to the MQTT server/broker. At what Layer of the OSI Model should troubleshooting begin when using a bottom-up method?
- A. Layer 5
- B. Layer 4
- C. Layer 6
- D. Layer 1
正解：D
解説：
Bottom-Up Troubleshooting: The OSI model provides a structured diagnostic approach. Starting at Layer 1 ensures basic physical connectivity issues are ruled out first.
MQTT Relies on IP: MQTT operates at a higher layer of the OSI model, relying on TCP/IP (Layers 4 and 3) for communication. Problems at the physical layer will disrupt everything built upon it.
Checking the Fundamentals: Before investigating complex application issues (MQTT), verify cables, link lights, Wi-Fi signal strength, etc.
References:
OSI Model: Descriptions of the seven layers, emphasizing the foundation provided by Layer 1 (Physical).
Network Troubleshooting Guides: Resources that outline common Layer 1 problems and their symptoms.
質問 # 30
What does the number in the various Quadrature Amplitude Modulation levels, such as 16 in QAM-16 and 64 in QAM-64, indicate? (Choose the single best answer.)
- A. The number of target points in the QAM constellation, which are equivalent to amplitude and phase combinations
- B. The speed of data transfer, which is four times the number in the QAM level
- C. The number of spatial streams, which is 1/4 the number in the QAM level
- D. The channel width, which is stipulated in MHz
正解：A
解説：
QAM Constellations: QAM (Quadrature Amplitude Modulation) uses a constellation diagram where points represent unique combinations of amplitude and phase.
Bits per Symbol: The number in QAM-XX indicates the number of points:
QAM-16: 16 points = 2
