Eccouncil Exam ICS-SCADA Topic 4 Question 1 Discussion

Actual exam question for Eccouncil's ICS-SCADA exam

Question #: 1
Topic #: 4

[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 Domingo at May 22, 2024, 12:05 PM

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Beckie

10 months ago

D) 502 - Easy peasy, Modbus TCP is all about that port 502. It's like the secret handshake of industrial protocols.

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William

9 months ago

C) 505 - Incorrect, the correct port for Modbus TCP is 502.

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Yolande

9 months ago

A) 205 - Nope, that's not the correct port for Modbus TCP.

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Colette

9 months ago

D) 502 - That's correct! Port 502 is indeed used for communications in Modbus TCP.

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Sharee

10 months ago

A) 205 - Hmm, I'm not too sure about this one. Maybe I should have paid more attention in that Modbus class.

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Meghan

10 months ago

C) 505 - Yes, it's definitely D) 502 for Modbus TCP communications.

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Elliot

10 months ago

B) 405 - I remember learning that it's D) 502 as well.

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Hoa

10 months ago

A) 205 - Don't worry, I think it's D) 502.

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Maybelle

10 months ago

C) 505 - Haha, I bet the person who wrote this question is trying to trick us. Nice try, but I'm not falling for it!

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Brandon

9 months ago

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

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Aide

9 months ago

A) 205 - I think it might be 502 actually.

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Cecily

9 months ago

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

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Stevie

10 months ago

C) 505 - Haha, I bet the person who wrote this question is trying to trick us. Nice try, but I'm not falling for it!

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Lashonda

10 months ago

A) 205 - I think it's 502, not 505.

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Ashton

10 months ago

D) 502 - Yeah, I agree. 505 seems like a trick answer.

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Rima

10 months ago

A) 205 - I think it's 502, not 505.

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Justa

11 months ago

D) 502 - I'm pretty sure that's the correct answer, as Modbus TCP uses port 502 for communication.

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Kenny

9 months ago

Good to know, thanks for sharing!

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Shawnta

9 months ago

There are many, such as port 80 for HTTP and port 443 for HTTPS.

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Sharmaine

10 months ago

So, what other ports are commonly used for communication protocols?

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My

10 months ago

No problem, happy to help!

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Dewitt

10 months ago

I wasn't sure about that, thanks for clarifying.

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Cammy

10 months ago

Yes, you are correct. Port 502 is indeed used for communications in Modbus TCP.

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Allene

10 months ago

D) 502 - I'm pretty sure that's the correct answer, as Modbus TCP uses port 502 for communication.

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Ivette

10 months ago

Yes, you are correct. Port 502 is indeed used for communications in Modbus TCP.

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Melda

10 months ago

D) 502 - I'm pretty sure that's the correct answer, as Modbus TCP uses port 502 for communication.

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