ICT Mobile and IoT Devices 3 — Questions and Answers
Question 1: An IoT temperature sensor needs to transmit data over several miles with very low power. Which LPWAN technology is most appropriate?
- Bluetooth 5.0
- LoRaWAN (Correct answer)
- Wi-Fi Direct
- NFC
Correct answer: LoRaWAN
LoRaWAN (Long Range Wide Area Network) supports long-range transmission (up to 15+ km) with extremely low power consumption, ideal for remote IoT sensors.
Question 2: Which mobile device management (MDM) enrollment method requires no user interaction and automatically configures corporate settings when a new device is first powered on?
- BYOD enrollment
- Zero-touch enrollment (Correct answer)
- QR code enrollment
- Manual enrollment
Correct answer: Zero-touch enrollment
Zero-touch enrollment pre-configures devices before distribution so they automatically enroll in MDM when first activated.
Question 3: What is the purpose of an eSIM in modern mobile devices?
- Expands internal storage capacity
- Provides a programmable SIM without a physical card (Correct answer)
- Enables dual-band Wi-Fi
- Encrypts SMS messages
Correct answer: Provides a programmable SIM without a physical card
An eSIM (embedded SIM) is a programmable chip built into the device that can be remotely provisioned with carrier information without a physical SIM card.
Question 4: A smart home hub uses Z-Wave to control devices. What frequency band does Z-Wave primarily operate on in the US?
- 2.4 GHz
- 5 GHz
- 908.42 MHz (Correct answer)
- 433 MHz
Correct answer: 908.42 MHz
Z-Wave in the US operates at 908.42 MHz, which provides better wall penetration than 2.4 GHz and avoids Wi-Fi congestion.
Question 5: Which feature in iOS allows apps to continue brief background tasks after the user switches away, such as finishing a download?
- App Nap
- Background App Refresh (Correct answer)
- Handoff
- Universal Control
Correct answer: Background App Refresh
Background App Refresh allows iOS apps to fetch new content and complete tasks in the background when on Wi-Fi or cellular.
Question 6: What does 'tethering' refer to on a mobile device?
- Connecting a wearable to a smartphone via Bluetooth
- Sharing a mobile data connection with other devices (Correct answer)
- Syncing contacts between devices
- Locking a device to prevent theft
Correct answer: Sharing a mobile data connection with other devices
Tethering allows a mobile device to share its cellular data connection with other devices via Wi-Fi hotspot, USB, or Bluetooth.
Question 7: Which security feature on modern smartphones stores cryptographic keys and performs sensitive operations in an isolated hardware environment separate from the main OS?
- Trusted Platform Module (TPM)
- Secure Enclave / Secure Element (Correct answer)
- Sandbox environment
- Knox container
Correct answer: Secure Enclave / Secure Element
A Secure Enclave (Apple) or Secure Element is dedicated hardware that stores keys and performs cryptographic operations in isolation from the main processor.
ICT Mobile and IoT Devices 3
An IoT temperature sensor needs to transmit data over several miles with very low power.
Which LPWAN technology is most appropriate?