A solar-powered IoT node runs an RTOS and must operate through the night on battery. The node has a sensor that must sample every 1 second, but the CPU can be put into a low-power state between samples. The developer is considering two approaches: (A) use a tickless idle mode that wakes on a timer, or (B) use a periodic tick interrupt every 1 ms to maintain timing accuracy. Which approach is more appropriate for maximizing battery life?

Use a busy-wait loop with a high-resolution timer

Use tickless idle mode to keep the CPU asleep until the next sensor sample is due

Use dynamic voltage and frequency scaling (DVFS) to reduce the CPU voltage during idle

Use a periodic tick interrupt every 1 ms to maintain timing accuracy

A smart agriculture system uses a gateway that collects data from sensors over Zigbee and sends it to the cloud over Ethernet. The gateway runs an embedded OS. Which networking capability must the OS support?

Only a TCP/IP stack with Ethernet driver

Both a Zigbee protocol stack and a TCP/IP stack with Ethernet driver

A Bluetooth Low Energy stack and a Wi-Fi stack

A manufacturer of smart locks wants to ensure that only signed firmware can run on the device and that a compromised application cannot read the cryptographic keys stored in flash. Which combination of OS features should they enable?

Dynamic memory allocation and a heap overflow detector

A real-time scheduler with priority inversion prevention

Secure boot with signature verification and a memory protection unit that isolates the key storage region

A debugger interface and a serial console for troubleshooting

Which factor is most important when selecting an IoT operating system for a battery-powered sensor that must last for years?

Compatibility with desktop applications

Ability to run multiple virtual machines

Support for a graphical user interface

Low power consumption and efficient sleep modes

A company is building a smart speaker that needs to run a voice recognition model, connect to Wi-Fi, and support over-the-air updates. The device has 512 MB of RAM and a dual-core ARM Cortex-A processor. Which OS is most appropriate?

A general-purpose OS like Linux

A real-time OS with a cooperative scheduler

A bare-metal firmware without an OS

A lightweight RTOS like FreeRTOS

EC-CouncilIoT Security Essentials

Domain 2Objective 2

IoT Operating Systems ISE Practice Questions (Page 4)

Part of the IoT Hardware and Platforms domain, which makes up ~18% of our current practice bank. EC-Council does not publish an official question count, but from its 120-minute exam (~50–80 total, ~9–14 in this domain), expect 2–4 from this objective — we provide 44 practice questions to prepare you well beyond it. (estimate)

44questions here

9free pages

8concepts

Questions 16–20

16expert · hard
A solar-powered IoT node runs an RTOS and must operate through the night on battery. The node has a sensor that must sample every 1 second, but the CPU can be put into a low-power state between samples. The developer is considering two approaches: (A) use a tickless idle mode that wakes on a timer, or (B) use a periodic tick interrupt every 1 ms to maintain timing accuracy. Which approach is more appropriate for maximizing battery life?
Select an answer first
17application · medium
A smart agriculture system uses a gateway that collects data from sensors over Zigbee and sends it to the cloud over Ethernet. The gateway runs an embedded OS. Which networking capability must the OS support?
Select an answer first
18application · medium
A manufacturer of smart locks wants to ensure that only signed firmware can run on the device and that a compromised application cannot read the cryptographic keys stored in flash. Which combination of OS features should they enable?
Select an answer first
19foundation · easy
Which factor is most important when selecting an IoT operating system for a battery-powered sensor that must last for years?
Select an answer first
20application · medium
A company is building a smart speaker that needs to run a voice recognition model, connect to Wi-Fi, and support over-the-air updates. The device has 512 MB of RAM and a dual-core ARM Cortex-A processor. Which OS is most appropriate?
Select an answer first

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