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| Section | Objectives |
|---|---|
| Security in Wireless IoT | - IoT device security principles - Wireless security mechanisms - Threats and mitigation strategies |
| Networking and Protocols | - IP networking fundamentals for IoT - IoT communication protocols (MQTT, CoAP concepts) |
| Deployment and Troubleshooting | - Performance optimization - IoT deployment considerations - Basic troubleshooting methodologies |
| Wireless Technologies for IoT | - Wi-Fi for IoT applications - LPWAN technologies (e.g., LoRaWAN, NB-IoT concepts) - Bluetooth and BLE |
| Wireless IoT Fundamentals | - IoT architecture concepts - Wireless IoT use cases - Device types and ecosystems |
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NEW QUESTION # 74
How is ASK modulation different from FSK modulation?
Answer: C
Explanation:
ASK (Amplitude Shift Keying): Digital data is represented by changes in the amplitude (strength) of a carrier wave.
FSK (Frequency Shift Keying): Digital data is represented by changes in the frequency of a carrier wave.
NEW QUESTION # 75
As an RF signal propagates it becomes weaker as it gets farther away from the transmitter. What concept is described?
Answer: C
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.
References:The information provided aligns with the Friis Transmission Equation, which models how the power of an RF signal decreases with distance1. Additionally, the concept of FSPL is a well-known phenomenon in RF propagation, affecting the design and optimization of wireless communication systems
NEW QUESTION # 76
You are defining capacity for a wireless solution. What is the most important factor related to each use case defined in relation to capacity?
Answer: B
Explanation:
* 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.
NEW QUESTION # 77
What process, used for security in wireless solutions, is defined as the encoding of information to prevent readability by unauthorized users?
Answer: D
Explanation:
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.
NEW QUESTION # 78
How is ASK modulation different from FSK modulation?
Answer: C
Explanation:
* Key Modulation Differences:
* ASK (Amplitude Shift Keying): Digital data is represented by changes in the amplitude (strength) of a carrier wave.
* FSK (Frequency Shift Keying): Digital data is represented by changes in the frequency of a carrier wave.
References
* ASK: https://en.wikipedia.org/wiki/Amplitude-shift_keying
* FSK: https://en.wikipedia.org/wiki/Frequency-shift_keying
NEW QUESTION # 79
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