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Eccouncil Exam ICS-SCADA Topic 5 Question 14 Discussion

Actual exam question for Eccouncil's ICS-SCADA exam
Question #: 14
Topic #: 5
[All ICS-SCADA Questions]

What is the size in bytes of the TCP sequence number in the header?

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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 France at Sep 11, 2024, 02:58 PM

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Avery
6 months ago
I remember studying that it's D) 502 because it's the default port for Modbus TCP.
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Hoa
6 months ago
Ding ding ding! 502 is the winner! Hey, at least they're not asking about the secret Modbus dance moves.
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Rex
6 months ago
Hmm, let me think... 502 sounds right. Although, I do enjoy a good game of 'guess the port number'.
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Norah
5 months ago
User 4: 502 is the port used for Modbus TCP communication.
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Loreta
5 months ago
I'm not sure, but I'll go with 502 too.
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Lucy
5 months ago
I agree, 502 is the correct port.
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Launa
5 months ago
I think it's 502.
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Yolando
6 months ago
I'm not sure, but I think it's either C) 505 or D) 502.
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Tony
6 months ago
I agree with Timmy, port 502 is used for Modbus TCP communication.
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Reuben
6 months ago
Oh, come on! 502 is the standard Modbus TCP port. I could answer this in my sleep.
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Lovetta
6 months ago
Port 502? Really? That's so obvious, even a toddler would know that.
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Lynette
5 months ago
Good to know, thanks for sharing!
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Gerald
6 months ago
Yeah, Port 502 is commonly used for Modbus TCP.
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Gilma
6 months ago
Oh, I didn't know that. Thanks for the info!
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Howard
6 months ago
Port 502 is correct for Modbus TCP communication.
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Charlesetta
6 months ago
It's a common port number for Modbus TCP, easy to remember.
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Moira
6 months ago
Yes, port 502 is used for Modbus TCP communication.
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Timmy
7 months ago
I think the correct answer is D) 502.
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