ISA/IEC 62443 Cybersecurity Fundamentals Specialist — Question 48

What is the name of the protocol that implements serial Modbus over Ethernet?

Answer options

• A. MODBUS/CIP
• B. MODBUS/Ethernet
• C. MODBUS/Plus
• D. MODBUS/TCP

Correct answer: D

Explanation

The correct answer is D, MODBUS/TCP, which specifically defines how Modbus can be implemented over TCP/IP networks. The other options, while related to Modbus, do not describe the implementation of serial Modbus over Ethernet.