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Eccouncil 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

Eccouncil ICS-SCADA Exam - Topic 2 Question 44 Discussion

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

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

Show Suggested Answer Hide Answer
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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Phyliss
4 days ago
I think it's D) 502. That's the standard port.
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Kattie
9 days ago
Yeah, 502 is the go-to port for that.
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Wayne
14 days ago
Nope, 502 is the one!
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Kina
19 days ago
Wait, are you sure? I thought it was 505.
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Brandee
24 days ago
Agreed, 502 is the standard for Modbus TCP.
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Lanie
29 days ago
It's definitely port 502!
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Jamal
1 month ago
I’m pretty confident it’s 502, but I might be mixing it up with another protocol.
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Mendy
1 month 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
1 month 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
2 months ago
I think Modbus TCP uses port 502, but I'm not completely sure. I remember it being a common one.
upvoted 0 times
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