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Eccouncil Exam ICS-SCADA Topic 2 Question 23 Discussion

Actual exam question for Eccouncil's ICS-SCADA exam

Question #: 23
Topic #: 2

[All ICS-SCADA Questions]

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

A205

B405

C505

D502

Show Suggested 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 Nguyet at Jan 13, 2025, 09:18 PM

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Katheryn

2 months ago

I'm going with D) 502. It's the standard port for Modbus TCP, just like how 80 is the standard port for HTTP. Easy to remember!

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Raymon

1 months ago

Yes, D) 502 is the standard port for Modbus TCP communication.

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Lucina

1 months ago

I agree, D) 502 is the correct port for Modbus TCP.

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Lavonda

2 months ago

I'm not sure, but I'll go with D) 502 as well.

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Carri

2 months ago

I agree with Gearldine, port 502 is used for Modbus TCP communication.

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Gearldine

2 months ago

I think the correct answer is D) 502.

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Allene

2 months ago

D) 502 - Modbus TCP uses the same port as the original Modbus protocol. I'm not sure why the other options are there, but 502 is the correct answer.

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Paola

1 months ago

D) 502 - Yes, you're right. Modbus TCP does use port 502 for communication.

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Craig

1 months ago

A) 205 - I think it's D) 502, that's the correct port for Modbus TCP.

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Sherman

2 months ago

Hmm, I'm pretty sure it's 502. Modbus TCP is just the TCP version of the classic Modbus protocol, so the port number should be the same.

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Corinne

24 days ago

Hmm, I'm pretty sure it's 502. Modbus TCP is just the TCP version of the classic Modbus protocol, so the port number should be the same.

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Lavonne

26 days ago

D) 502

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Ling

29 days ago

C) 505

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Rodolfo

1 months ago

B) 405

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Emelda

1 months ago

A) 205

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Joaquin

2 months ago

Port 502? That's a no-brainer! Modbus TCP uses the same port as the original Modbus protocol. Easy peasy!

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Alita

1 months ago

That's correct! Port 502 is used for communications in Modbus TCP.

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Selma

2 months ago

Port 502 is the correct answer. It's the same port as the original Modbus protocol.

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Chana

2 months ago

Yes, you're right! Modbus TCP uses port 502.

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