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EC-Council ICS-SCADA Exam - Topic 2 Question 44 Discussion

Which of the following ports are used for communications in Modbus TCP?
D) 502
A) 205
B) 405
C) 505

EC-Council ICS-SCADA Exam - Topic 2 Question 44 Discussion

Actual exam question for EC-Council's ICS-SCADA exam
Question #: 44
Topic #: 2
[All ICS-SCADA Questions]

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

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Suggested Answer: D

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.


by Anisha at May 29, 2026, 11:48 PM

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Novella
27 days ago
Same here! 502 is crucial for Modbus communication.
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Dorathy
1 month ago
I was confused at first, but 502 is the answer.
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Kristin
1 month ago
Yeah, 502 is the right choice. It’s widely used.
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Chantell
1 month ago
I remember reading about it. Definitely 502.
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Chandra
2 months ago
Agreed! Modbus TCP uses 502.
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Phyliss
2 months ago
I think it's D) 502. That's the standard port.
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Kattie
2 months ago
Yeah, 502 is the go-to port for that.
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Wayne
2 months ago
Nope, 502 is the one!
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Kina
2 months ago
Wait, are you sure? I thought it was 505.
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Brandee
2 months ago
Agreed, 502 is the standard for Modbus TCP.
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Lanie
3 months ago
It's definitely port 502!
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Jamal
3 months ago
I’m pretty confident it’s 502, but I might be mixing it up with another protocol.
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Mendy
3 months ago
I can't recall the exact port number, but I remember that Modbus TCP is a standard protocol. Could it be 405?
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Allene
3 months ago
I feel like I saw a question about Modbus ports in practice exams, and 502 was definitely mentioned there.
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King
3 months ago
I think Modbus TCP uses port 502, but I'm not completely sure. I remember it being a common one.
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