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Eccouncil ICS-SCADA Exam - Topic 7 Question 34 Discussion

Actual exam question for Eccouncil's ICS-SCADA exam
Question #: 34
Topic #: 7
[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 Oretha at Aug 18, 2025, 04:03 PM

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Oliva
2 months ago
Wait, are you guys sure about that?
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Lottie
2 months ago
Definitely, it's 502 for sure!
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Mabel
3 months ago
502 is the standard port, no doubt!
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Melda
3 months ago
I thought it was 505?
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Dottie
3 months ago
Modbus TCP uses port 502.
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Mona
3 months ago
I remember reading about Modbus TCP and its ports, and I think 502 is definitely the right choice. It’s the one that keeps coming up in my notes.
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Moon
4 months ago
I’m a bit confused. I thought there were multiple ports for Modbus, but I can’t recall if 502 is the only one used for TCP.
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Eric
4 months ago
I practiced a question like this before, and I believe 502 was the answer. It seems to be the standard for Modbus.
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France
4 months ago
I think Modbus TCP uses port 502, but I’m not completely sure. I remember it being one of the common ports.
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Jaime
4 months ago
Wait, is it 502? Or was it something else... Ugh, I'm drawing a blank on the Modbus TCP port details. I better review my notes before answering this one.
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Iesha
4 months ago
Easy peasy! Modbus TCP uses port 502 for communications. I remember learning that in my networking class. Gotta love those standard port numbers.
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Queen
5 months ago
Hmm, I'm a bit unsure about this one. I know Modbus is a common industrial protocol, but I can't remember the specific port numbers off the top of my head. I'll have to think this through carefully.
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Ammie
5 months ago
I'm pretty sure the correct answer is D. 502 is the standard Modbus TCP port, so that's the one I'll go with.
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Denny
5 months ago
I agree with Tyisha, D) 502 is the correct port for Modbus TCP.
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Rex
6 months ago
Aha! I remember learning about this in my networking class. Definitely going with D. 502 is the one.
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Cassi
6 months ago
Hmm, I'm pretty sure it's 502. Modbus TCP has been around for a while, and that's the standard port they use.
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Rodolfo
5 months ago
Yeah, I remember setting up Modbus TCP and it was definitely port 502.
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Whitley
5 months ago
I think you're right, Modbus TCP does use port 502.
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Tyisha
6 months ago
I think the answer is D) 502.
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