Quick Answer
The answer is low data transfer rates, which is a defining characteristic of a Bluetooth Low Energy (BLE) IoT device that makes it ideal for a battery-powered sensor. BLE achieves its ultra-low power consumption by transmitting small packets of data in short bursts and then immediately entering a deep sleep mode, a design trade-off that inherently limits throughput but extends battery life to months or years on a coin cell. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of how IoT attack surfaces differ—attackers often target the constrained bandwidth or sleep cycles of BLE sensors rather than high-speed data channels. A common trap is confusing BLE’s low power with high data rates, but remember that classic Bluetooth or Wi-Fi prioritize speed over energy efficiency. For a quick memory tip: think “BLE = Burst, Low Energy, short range,” and recall that a sensor sending temperature readings every hour doesn’t need a 1 Mbps stream—just a tiny, efficient whisper of data.
This CEH practice question tests your understanding of wireless, iot and cloud security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are characteristics of a Bluetooth Low Energy (BLE) IoT device that make it suitable for a battery-powered sensor?
High data throughput.
Why wrong: BLE has low data rate.
Long range (up to 1 km).
Why wrong: BLE range is typically up to 100m.
Low energy consumption.
BLE is optimized for low power.
Low data transfer rates.
Sensors send small data.
Operates in unlicensed spectrum like Wi-Fi.
Why wrong: BLE uses 2.4 GHz but is not Wi-Fi.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Low energy consumption.
Option C is correct because BLE is specifically designed for ultra-low power consumption, enabling battery-powered sensors to operate for months or years on a coin cell battery. BLE achieves this by using short bursts of data transmission and then entering a deep sleep mode, drastically reducing energy usage compared to classic Bluetooth or Wi-Fi.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
High data throughput.
Why it's wrong here
BLE has low data rate.
Long range (up to 1 km).
Why it's wrong here
BLE range is typically up to 100m.
Low energy consumption.
Why this is correct
BLE is optimized for low power.
Related concept
Read the scenario before looking for a memorised answer.
Low data transfer rates.
Why this is correct
Sensors send small data.
Related concept
Read the scenario before looking for a memorised answer.
Operates in unlicensed spectrum like Wi-Fi.
Why it's wrong here
BLE uses 2.4 GHz but is not Wi-Fi.
Common exam traps
EC-Council often tests the misconception that 'low energy' means low data rate, but the trap here is that candidates might incorrectly select 'High data throughput' (A) or 'Long range' (B) because they confuse BLE with classic Bluetooth or other IoT protocols, overlooking BLE's explicit design trade-off for power efficiency over speed and distance.
Detailed technical explanation
BLE uses a connectionless advertising mode and adaptive frequency hopping to minimize power draw, with a peak current consumption of around 15 mA during transmission and less than 1 µA in sleep mode. In real-world IoT deployments, a BLE temperature sensor might transmit a few bytes of data every minute, achieving a battery life of over two years on a CR2032 coin cell. This contrasts with Wi-Fi, which requires a higher current draw and longer connection setup times, making it impractical for long-term battery operation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Wireless, IoT and Cloud Security — This question tests Wireless, IoT and Cloud Security — Read the scenario before looking for a memorised answer..
The correct answer is: Low energy consumption. — Option C is correct because BLE is specifically designed for ultra-low power consumption, enabling battery-powered sensors to operate for months or years on a coin cell battery. BLE achieves this by using short bursts of data transmission and then entering a deep sleep mode, drastically reducing energy usage compared to classic Bluetooth or Wi-Fi.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CEH practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CEH exam.
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