A team is developing a wireless soil-moisture sensor that must run for two years on two AA batteries. The sensor wakes up every 15 minutes, takes a reading, transmits it over LoRaWAN, and then goes back to sleep. Which power management approach is most effective for maximizing battery life?

Use a microprocessor that can run Linux and use its built-in power management

Keep the microcontroller in active mode but lower the clock frequency to reduce power

Use a microcontroller with a deep-sleep mode that draws microamps and wake on a timer interrupt

Disable the radio and keep the CPU running to respond to interrupts

An industrial IoT company is selecting a processor for a vibration sensor that will be deployed in a factory. The sensor must sample vibration data at 20 kHz, perform FFT analysis locally, and send alerts only when anomalies are detected. The device is powered by a wired 24V supply, so power is not a constraint. The team is considering an ARM Cortex-M7 and an ARM Cortex-A53. Which factor is most important in choosing the Cortex-M7?

It has a higher clock speed than the Cortex-A53, enabling faster FFT computation.

It has a floating-point unit (FPU) and DSP instructions that are sufficient for FFT analysis at 20 kHz.

It can run Linux, which simplifies the implementation of the FFT algorithm.

It supports a memory management unit (MMU) for better memory protection.

EC-CouncilIoT Security Essentials

Domain 2Objective 1

IoT Hardware Devices and Processors ISE Practice Questions (Page 5)

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 48 practice questions to prepare you well beyond it. (estimate)

48questions here

10free pages

9concepts

Questions 21–25

21application · medium
A team is developing a wireless soil-moisture sensor that must run for two years on two AA batteries. The sensor wakes up every 15 minutes, takes a reading, transmits it over LoRaWAN, and then goes back to sleep. Which power management approach is most effective for maximizing battery life?
Select an answer first
22expert · hard
An industrial IoT company is selecting a processor for a vibration sensor that will be deployed in a factory. The sensor must sample vibration data at 20 kHz, perform FFT analysis locally, and send alerts only when anomalies are detected. The device is powered by a wired 24V supply, so power is not a constraint. The team is considering an ARM Cortex-M7 and an ARM Cortex-A53. Which factor is most important in choosing the Cortex-M7?
Select an answer first
23application · medium
A developer is selecting a processor for a smart home hub that must run a Linux-based application, handle Wi-Fi and Zigbee communications, and support a touchscreen display. The device will be plugged into AC power, so energy efficiency is not the primary concern. Which processor architecture is the most appropriate choice?
Select an answer first
24foundation · easy
An IoT device needs to store small amounts of configuration data (e.g., device ID, calibration values) that must survive power cycles. Which memory type is most appropriate for this purpose?
Select an answer first
25foundation · easy
In a smart agriculture IoT deployment, soil moisture sensors collect data and send it to a central hub that forwards it to the cloud. Which IoT hardware device category does the central hub represent?
Select an answer first

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IoT Hardware Devices and Processors ISE Practice Questions (Page 5)

Questions 21–25

A team is developing a wireless soil-moisture sensor that must run for two years on two AA batteries. The sensor wakes up every 15 minutes, takes a reading, transmits it over LoRaWAN, and then goes back to sleep. Which power management approach is most effective for maximizing battery life?

An IoT device needs to store small amounts of configuration data (e.g., device ID, calibration values) that must survive power cycles. Which memory type is most appropriate for this purpose?

In a smart agriculture IoT deployment, soil moisture sensors collect data and send it to a central hub that forwards it to the cloud. Which IoT hardware device category does the central hub represent?

Keep studying — IoT Hardware and Platforms