CWNP Updated CWISA-102 Exam Questions and Answers by selena

• 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/

• 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.

• SINR vs. SNR:
• Practical Importance: SINR is a more realistic indicator of real-world signal quality in wireless environments where interference is a significant factor.

References

• SINR: https://en.wikipedia.org/wiki/Signal-to-interference-plus-noise_ratio
• SNR: https://en.wikipedia.org/wiki/Signal-to-noise_ratio

• 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:

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