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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?

A2

B1

C3

D4

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 France at Sep 11, 2024, 02:58 PM

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Daryl

19 days ago

Wait, is this a trick question? What if the answer is actually 3 bytes, just to mess with us? Nah, better stick with the classic 4 bytes. *chuckles*

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Lavera

20 days ago

If the TCP sequence number was only 1 byte, we'd be in trouble! Definitely going with D) 4 bytes. Bring on the next question!

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Karima

1 months ago

2 bytes? That's way too small for a sequence number. I'm feeling pretty confident about D) 4 bytes. Time to impress the examiner!

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Mollie

10 days ago

I agree, D) 4 bytes seems like the correct answer for the TCP sequence number size.

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Quentin

14 days ago

I'm not sure, but I'll go with D) 4 bytes as well. It seems like the most logical choice.

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Rosann

19 days ago

I think it's D) 4 bytes too. It makes more sense for a sequence number.

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Malcom

1 months ago

Ah, the old TCP sequence number question. I remember this from my networking classes. Gotta be 4 bytes, no doubt about it!

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Nakita

18 hours ago

Definitely 4 bytes, no question about it.

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Wilda

21 days ago

Yeah, 4 bytes for sure, that's the standard.

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Skye

1 months ago

I think it's 4 bytes too, makes sense.

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Idella

2 months ago

Hmm, let me think... TCP sequence numbers are crucial for tracking data flow, so the size must be a decent number. I'm going to go with D) 4 bytes.

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Desiree

21 days ago

I agree, D) 4 sounds right.

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Alfreda

30 days ago

I think it's D) 4

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Sheridan

2 months ago

I agree, the TCP sequence number is typically 4 bytes long.

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Tesha

2 months ago

I think it's 4 bytes.

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Sheridan

2 months ago

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

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