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Question 65 - ICS-SCADA Cyber Security discussion

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Which of the following ports are used for communications in Modbus TCP?

A.
205
Answers
A.
205
B.
405
Answers
B.
405
C.
505
Answers
C.
505
D.
502
Answers
D.
502
Suggested answer: D

Explanation:

Modbus TCP is a variant of the Modbus family of simple, networked protocols aimed at industrial automation applications. Unlike the original Modbus protocol, which runs over serial links, Modbus TCP runs over TCP/IP networks.

Port 502 is the standard TCP port used for Modbus TCP communications. This port is designated for Modbus messages encapsulated in a TCP/IP wrapper, facilitating communication between Modbus devices and management systems over an IP network.

Knowing the correct port number is crucial for network configuration, security settings, and troubleshooting communications within a Modbus-enabled ICS/SCADA environment.

Reference

Modbus Organization, 'MODBUS Application Protocol Specification V1.1b3'.

'Modbus TCP/IP -- A Comprehensive Network protocol,' by Schneider Electric.

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asked 18/09/2024
Ravi Bhatt
28 questions
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