DEX IOT DAY 2 EXAM STUDY GUIDE 2026
COMPLETE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED
PASS <RECENT VERSION>
1. In the context of IoT device provisioning, what is the primary purpose of a Device Identity
Composition Engine (DICE)?
A. To provide a user-friendly name for the device.
B. To generate a unique, hardware-based cryptographic identity from a foundational secret.
C. To compose a list of all installed software components.
D. To manage the device's power consumption profile.
ANSWER: B ✓
2. The MQTT protocol primarily operates over which transport layer protocol?
A. UDP
B. ICMP
C. TCP ✓
D. HTTP
3. A "brownout" condition refers to:
A. A complete loss of power.
B. A short-term increase in voltage.
C. A long-term decrease in voltage below the normal operating range. ✓
D. A fluctuation in electrical frequency.
4. Which of the following is a key characteristic of a "Day 2" operations mindset?
A. Focusing solely on the initial device deployment.
B. Proactive monitoring, management, and optimization of deployed assets. ✓
C. Designing the initial network architecture.
D. Ordering hardware for the pilot project.
5. The LoRaWAN protocol is best suited for applications requiring:
A. High-bandwidth video streaming.
B. Low-power, long-range communication for small data packets. ✓
C. Ultra-low latency for real-time control.
D. Wired, high-reliability connections.
,6. What is the main function of an IoT Gateway?
A. To act as a primary power source for sensors.
B. To provide a user interface for end-users.
C. To bridge communication between different networks or protocols (e.g., translating Zigbee to
Wi-Fi). ✓
D. To develop firmware for edge devices.
7. In a Zero-Trust architecture for IoT, the principle of "least privilege" means:
A. All devices are trusted once they are on the corporate network.
B. Devices and users are granted only the permissions essential to perform their function. ✓
C. Privileges are automatically escalated after 24 hours.
D. The system uses the least amount of electrical power possible.
8. Which component is responsible for securely storing cryptographic keys on an IoT device?
A. The Central Processing Unit (CPU).
B. The Hardware Security Module (HSM) or Trusted Platform Module (TPM). ✓
C. The main system RAM.
D. The device's serial port.
9. A device fleet manager notices that a group of devices is failing to download a firmware
update. The update server's logs show "Connection Reset by Peer." What is the MOST likely
cause?
A. The devices have insufficient storage space for the update package. ✓
B. The devices are using an incorrect encryption key.
C. The update server has a faulty CPU.
D. The network switch has failed.
10. The process of remotely wiping configuration and data from a lost or compromised IoT
device is known as:
A. Provisioning.
B. Sanitization. ✓
C. Reprovisioning.
D. Cloning.
11. What does the term "Device Twin" refer to in platforms like Azure IoT Hub or AWS IoT
Core?
A. A physical backup device.
B. A digital representation of a physical device that stores its state and metadata. ✓
C. A twin-core processor inside the device.
D. A method for pairing two devices together.
,12. The primary security risk associated with having a default, well-known password on an IoT
device is:
A. Increased power consumption.
B. Unauthorized access and device compromise. ✓
C. Slower network performance.
D. Incompatibility with newer protocols.
13. Which network topology is most resilient to a single point of failure?
A. Star
B. Bus
C. Ring
D. Mesh ✓
14. Anomaly detection in IoT sensor data is primarily used for:
A. Compressing data before transmission.
B. Identifying patterns that deviate from normal behavior, indicating potential faults or security
incidents. ✓
C. Converting analog signals to digital.
D. Increasing the sampling rate of the sensor.
15. What is the purpose of a "Watchdog Timer" in an embedded system?
A. To display the time to the user.
B. To automatically reset the device if the software hangs or fails to respond. ✓
C. To monitor for intruders on the network.
D. To time the duration of software operations.
16. The OTA (Over-The-Air) update mechanism MUST include which of the following to ensure
integrity?
A. A graphical user interface.
B. A low-latency connection.
C. Cryptographic verification of the update payload. ✓
D. A physical button press on the device.
17. A CAN (Controller Area Network) bus is commonly used in:
A. Home entertainment systems.
B. Automotive applications for communication between microcontrollers. ✓
C. Long-range agricultural sensors.
D. Underwater cabling.
, 18. The concept of "Digital Shadow" in IoT refers to:
A. A device's power consumption profile.
B. The digital footprint and data exhaust a device creates during its lifecycle. ✓
C. A type of encryption algorithm.
D. The physical shadow cast by a device's enclosure.
19. Which tool is best for capturing and analyzing network traffic to debug a communication
issue between an IoT device and the cloud?
A. A Multimeter
B. Wireshark ✓
C. An Oscilloscope
D. A Logic Analyzer
20. What is a primary benefit of using a message broker (like MQTT) in an IoT architecture?
A. It increases the clock speed of the device's CPU.
B. It decouples the producers and consumers of messages, enabling asynchronous
communication. ✓
C. It provides a physical connection between devices.
D. It converts AC power to DC power.
21. A "Thing" in the context of AWS IoT is defined as:
A. A virtual private cloud.
B. A logical representation of a device within the AWS cloud. ✓
C. A physical AWS data center.
D. An S3 storage bucket.
22. Which type of attack involves maliciously flooding a device with more traffic than it can
handle?
A. A Man-in-the-Middle attack.
B. A Denial-of-Service (DoS) attack. ✓
C. A Brute-force attack.
D. A Phishing attack.
23. The mosquitto_pub command-line tool is used with which protocol?
A. CoAP
B. HTTP
C. AMQP
D. MQTT ✓
COMPLETE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED
PASS <RECENT VERSION>
1. In the context of IoT device provisioning, what is the primary purpose of a Device Identity
Composition Engine (DICE)?
A. To provide a user-friendly name for the device.
B. To generate a unique, hardware-based cryptographic identity from a foundational secret.
C. To compose a list of all installed software components.
D. To manage the device's power consumption profile.
ANSWER: B ✓
2. The MQTT protocol primarily operates over which transport layer protocol?
A. UDP
B. ICMP
C. TCP ✓
D. HTTP
3. A "brownout" condition refers to:
A. A complete loss of power.
B. A short-term increase in voltage.
C. A long-term decrease in voltage below the normal operating range. ✓
D. A fluctuation in electrical frequency.
4. Which of the following is a key characteristic of a "Day 2" operations mindset?
A. Focusing solely on the initial device deployment.
B. Proactive monitoring, management, and optimization of deployed assets. ✓
C. Designing the initial network architecture.
D. Ordering hardware for the pilot project.
5. The LoRaWAN protocol is best suited for applications requiring:
A. High-bandwidth video streaming.
B. Low-power, long-range communication for small data packets. ✓
C. Ultra-low latency for real-time control.
D. Wired, high-reliability connections.
,6. What is the main function of an IoT Gateway?
A. To act as a primary power source for sensors.
B. To provide a user interface for end-users.
C. To bridge communication between different networks or protocols (e.g., translating Zigbee to
Wi-Fi). ✓
D. To develop firmware for edge devices.
7. In a Zero-Trust architecture for IoT, the principle of "least privilege" means:
A. All devices are trusted once they are on the corporate network.
B. Devices and users are granted only the permissions essential to perform their function. ✓
C. Privileges are automatically escalated after 24 hours.
D. The system uses the least amount of electrical power possible.
8. Which component is responsible for securely storing cryptographic keys on an IoT device?
A. The Central Processing Unit (CPU).
B. The Hardware Security Module (HSM) or Trusted Platform Module (TPM). ✓
C. The main system RAM.
D. The device's serial port.
9. A device fleet manager notices that a group of devices is failing to download a firmware
update. The update server's logs show "Connection Reset by Peer." What is the MOST likely
cause?
A. The devices have insufficient storage space for the update package. ✓
B. The devices are using an incorrect encryption key.
C. The update server has a faulty CPU.
D. The network switch has failed.
10. The process of remotely wiping configuration and data from a lost or compromised IoT
device is known as:
A. Provisioning.
B. Sanitization. ✓
C. Reprovisioning.
D. Cloning.
11. What does the term "Device Twin" refer to in platforms like Azure IoT Hub or AWS IoT
Core?
A. A physical backup device.
B. A digital representation of a physical device that stores its state and metadata. ✓
C. A twin-core processor inside the device.
D. A method for pairing two devices together.
,12. The primary security risk associated with having a default, well-known password on an IoT
device is:
A. Increased power consumption.
B. Unauthorized access and device compromise. ✓
C. Slower network performance.
D. Incompatibility with newer protocols.
13. Which network topology is most resilient to a single point of failure?
A. Star
B. Bus
C. Ring
D. Mesh ✓
14. Anomaly detection in IoT sensor data is primarily used for:
A. Compressing data before transmission.
B. Identifying patterns that deviate from normal behavior, indicating potential faults or security
incidents. ✓
C. Converting analog signals to digital.
D. Increasing the sampling rate of the sensor.
15. What is the purpose of a "Watchdog Timer" in an embedded system?
A. To display the time to the user.
B. To automatically reset the device if the software hangs or fails to respond. ✓
C. To monitor for intruders on the network.
D. To time the duration of software operations.
16. The OTA (Over-The-Air) update mechanism MUST include which of the following to ensure
integrity?
A. A graphical user interface.
B. A low-latency connection.
C. Cryptographic verification of the update payload. ✓
D. A physical button press on the device.
17. A CAN (Controller Area Network) bus is commonly used in:
A. Home entertainment systems.
B. Automotive applications for communication between microcontrollers. ✓
C. Long-range agricultural sensors.
D. Underwater cabling.
, 18. The concept of "Digital Shadow" in IoT refers to:
A. A device's power consumption profile.
B. The digital footprint and data exhaust a device creates during its lifecycle. ✓
C. A type of encryption algorithm.
D. The physical shadow cast by a device's enclosure.
19. Which tool is best for capturing and analyzing network traffic to debug a communication
issue between an IoT device and the cloud?
A. A Multimeter
B. Wireshark ✓
C. An Oscilloscope
D. A Logic Analyzer
20. What is a primary benefit of using a message broker (like MQTT) in an IoT architecture?
A. It increases the clock speed of the device's CPU.
B. It decouples the producers and consumers of messages, enabling asynchronous
communication. ✓
C. It provides a physical connection between devices.
D. It converts AC power to DC power.
21. A "Thing" in the context of AWS IoT is defined as:
A. A virtual private cloud.
B. A logical representation of a device within the AWS cloud. ✓
C. A physical AWS data center.
D. An S3 storage bucket.
22. Which type of attack involves maliciously flooding a device with more traffic than it can
handle?
A. A Man-in-the-Middle attack.
B. A Denial-of-Service (DoS) attack. ✓
C. A Brute-force attack.
D. A Phishing attack.
23. The mosquitto_pub command-line tool is used with which protocol?
A. CoAP
B. HTTP
C. AMQP
D. MQTT ✓
