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| Section | Objectives |
|---|---|
| Deployment and Troubleshooting | - Performance optimization - Basic troubleshooting methodologies - IoT deployment considerations |
| Wireless IoT Fundamentals | - Device types and ecosystems - IoT architecture concepts - Wireless IoT use cases |
| Networking and Protocols | - IoT communication protocols (MQTT, CoAP concepts) - IP networking fundamentals for IoT |
| Security in Wireless IoT | - Wireless security mechanisms - Threats and mitigation strategies - IoT device security principles |
| Wireless Technologies for IoT | - LPWAN technologies (e.g., LoRaWAN, NB-IoT concepts) - Wi-Fi for IoT applications - Bluetooth and BLE |
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NEW QUESTION # 39
As an RF signal propagates it becomes weaker as it gets farther away from the transmitter. What concept is described?
Answer: A
Explanation:
The concept described is Free Space Path Loss (FSPL). FSPL refers to the reduction in power density of an electromagnetic wave as it propagates through a clear, unobstructed path in free space. This weakening of the signal is due to the spreading of the wavefront as it travels, causing the power to be distributed over a larger area. The FSPL can be calculated using the Friis Transmission Equation, which shows that the received power decreases with the square of the distance from the transmitter. This concept is fundamental to understanding the behavior of RF signals in various communication systems, including wireless IoT, where the signal strength at the receiver is a critical factor for reliable data transmission.
NEW QUESTION # 40
In a wireless link, as the signal strength decreases, what else may decrease?
Answer: B
Explanation:
* Signal Strength and Data Rate: In wireless links, weaker signal strength often directly correlates to reduced transmission speeds. Modern wireless technologies use adaptive modulation and coding, sacrificing speed for reliability when signals become weaker.
* Noise and Interference: While these can impact performance, they don't inherently decrease simply because signal strength drops.
* Latency: Latency can be affected by poor signal, but its primary drivers are distance and network congestion.
References:
Wireless Signal Strength vs. Speed: Articles explaining the relationship and how adaptive modulation works.
Modulation and Coding Schemes (MCS): Technical descriptions of how Wi-Fi and other wireless technologies adjust speeds based on signal quality.
NEW QUESTION # 41
Which metric is MOST useful for evaluating wireless coverage for an IoT sensor with low receiver sensitivity?
Answer: C
Explanation:
Low-sensitivity sensors require sufficient signal strength (RSSI) for stable operation. Throughput and latency are less relevant for low-data IoT devices.
NEW QUESTION # 42
What is a valid reason to continue using older wireless networking technologies?
Answer: D
Explanation:
* Legacy Support: The primary reason to continue using older wireless technologies is the need to connect with devices that don't support newer standards (e.g., old sensors or equipment).
* Other Reasons (Not as Strong):
* Cost: Replacing legacy devices can be expensive.
* Reliability: Some legacy technologies might be well-proven in specific settings.
NEW QUESTION # 43
What user authentication method is commonly used in guest Wi-Fi networks in the hospitality industry?
Answer: D
Explanation:
* Captive Portals for Guest Access: These are web pages that intercept users' requests before granting full internet access. They often require agreeing to terms, entering basic information, or viewing ads.
* Hospitality Fit: Captive portals are simple to deploy, require minimal user setup, and provide control for the hospitality provider (e.g., usage limits).
* Why Other Options Are Less Common:
* NTLM: Microsoft authentication, mainly for corporate networks, too complex for casual guest use.
* Kerberos: Complex authentication for enterprise, overkill for guest Wi-Fi
* SIM Cards: Used in cellular devices, not for general Wi-Fi access.
References:
Captive Portals: Explanations of how they work and their use cases.
Guest Wi-Fi in Hospitality: Best practices highlight the prevalence of captive portals in this industry.
NEW QUESTION # 44
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