SecOT+ Common OT Protocols Modbus and DNP3 Quiz

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Thames
T
Thames
Community Contributor
Quizzes Created: 8865 | Total Attempts: 106,055
| Questions: 20 | Updated: Aug 13, 2026
Please wait...
Question 1 / 21
🏆 Rank #-- ▾
0 %
0/100
Score 0/100

1. What does APDU stand for in DNP3 terminology?

Submit
Please wait...
About This Quiz
SecOT+ Common Ot Protocols Modbus and Dnp3 Quiz - Quiz

This quiz evaluates your understanding of Modbus and DNP3, two critical protocols in operational technology (OT) environments. You'll assess key concepts including protocol architecture, security vulnerabilities, authentication mechanisms, and real-world deployment considerations. Mastering these protocols is essential for professionals securing industrial control systems and SCADA networks.

2.

What first name or nickname would you like us to use?

You may optionally provide this to label your report, leaderboard, or certificate.

2. Modbus RTU uses ____ transmission mode, requiring a quiet period between messages for frame delimitation.

Submit

3. DNP3 Secure Authentication employs ____ as the primary cryptographic hash algorithm.

Submit

4. In Modbus, the ____ register type is used to store read-write integer values.

Submit

5. DNP3 uses a ____ byte header for all APDU messages to identify message type and control flags.

Submit

6. The Modbus protocol default port number for TCP communication is____.

Submit

7. DNP3 Level 2 authentication provides protection against which specific attack vector?

Submit

8. Modbus function code 16 is used to write which type of data?

Submit

9. In DNP3, what is the primary function of the link layer?

Submit

10. Modbus Secure (Modbus Security Suite) adds which security feature to standard Modbus TCP?

Submit

11. What is the primary transport layer protocol used by standard Modbus TCP?

Submit

12. DNP3 uses a 16-bit address space for device identification. What is the maximum number of devices addressable?

Submit

13. Which Modbus variant is most commonly used in modern networked industrial systems?

Submit

14. In Modbus TCP, the transaction identifier serves what primary purpose?

Submit

15. DNP3 uses which error detection mechanism at the data link layer?

Submit

16. What is the maximum data payload size in a standard Modbus RTU frame?

Submit

17. DNP3 Secure Authentication (SA) primarily protects against which threat?

Submit

18. In Modbus, what does the function code 03 represent?

Submit

19. DNP3 uses a hierarchical communication model consisting of how many layers?

Submit

20. Which of the following is a key vulnerability of legacy Modbus RTU?

Submit
×
Saved
Thank you for your feedback!
View My Results
Cancel
  • All
    All (20)
  • Unanswered
    Unanswered ()
  • Answered
    Answered ()
What does APDU stand for in DNP3 terminology?
Modbus RTU uses ____ transmission mode, requiring a quiet period...
DNP3 Secure Authentication employs ____ as the primary cryptographic...
In Modbus, the ____ register type is used to store read-write integer...
DNP3 uses a ____ byte header for all APDU messages to identify message...
The Modbus protocol default port number for TCP communication is____.
DNP3 Level 2 authentication provides protection against which specific...
Modbus function code 16 is used to write which type of data?
In DNP3, what is the primary function of the link layer?
Modbus Secure (Modbus Security Suite) adds which security feature to...
What is the primary transport layer protocol used by standard Modbus...
DNP3 uses a 16-bit address space for device identification. What is...
Which Modbus variant is most commonly used in modern networked...
In Modbus TCP, the transaction identifier serves what primary purpose?
DNP3 uses which error detection mechanism at the data link layer?
What is the maximum data payload size in a standard Modbus RTU frame?
DNP3 Secure Authentication (SA) primarily protects against which...
In Modbus, what does the function code 03 represent?
DNP3 uses a hierarchical communication model consisting of how many...
Which of the following is a key vulnerability of legacy Modbus RTU?
play-Mute sad happy unanswered_answer up-hover down-hover success oval cancel Check box square blue
Alert!