New Year Sale 2026! Hurry Up, Grab the Special Discount - Save 25% - Ends In 00:00:00 Coupon code: SAVE25
Welcome to Pass4Success

- Free Preparation Discussions
Mail Us support@pass4success.com
Location US
Mob_nav_barsMENU

Eccouncil ICS-SCADA Exam - 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?

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 France at Sep 11, 2024, 02:58 PM

Limited Time Offer

25%

Off

Get Premium ICS-SCADA Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

0/2000 characters
Submit Cancel
Xochitl
3 months ago
I always thought it was 2 bytes, but I guess I was wrong!
upvoted 0 times
...
Gladys
3 months ago
Definitely 4 bytes, no doubt about it.
upvoted 0 times
...
Evangelina
3 months ago
Wait, is it really 4 bytes? I thought it was less.
upvoted 0 times
...
Polly
4 months ago
Totally agree, 4 bytes is correct!
upvoted 0 times
...
Hayley
4 months ago
It's 4 bytes for the TCP sequence number.
upvoted 0 times
...
Erinn
4 months ago
I’m leaning towards 4 bytes for the sequence number. It seems to match what I practiced in the review questions.
upvoted 0 times
...
Magnolia
4 months ago
I’m a bit confused. I thought TCP headers were always 20 bytes, but I can’t remember the size of the sequence number specifically.
upvoted 0 times
...
Maxima
4 months ago
I feel like I’ve seen a question like this before, and I think the answer is 4 bytes too. It’s definitely not 1 or 2 bytes.
upvoted 0 times
...
Chauncey
5 months ago
I think the TCP sequence number is 4 bytes, but I’m not completely sure. I remember it being a common topic in our networking class.
upvoted 0 times
...
Lucille
5 months ago
I'm a bit unsure about this one. The TCP header has a lot of different fields, and I don't want to just guess. I'll have to review my networking material to refresh my memory.
upvoted 0 times
...
Edelmira
5 months ago
Okay, the TCP sequence number is used for reliable data transfer, so the size must be large enough to handle the range of sequence numbers needed. I'm going to go with 4 bytes.
upvoted 0 times
...
Mabel
5 months ago
Hmm, I think I remember learning about the TCP sequence number, but I'm not totally sure about the size. I'll have to think this through carefully.
upvoted 0 times
...
Jacqueline
5 months ago
The TCP sequence number is definitely an important part of the TCP header, so I'm confident I can figure this out. Let me review the details in my notes.
upvoted 0 times
...
Alana
5 months ago
This one seems a bit tricky. I'm going to eliminate the options that don't sound right, and then make an educated guess on the correct answer.
upvoted 0 times
...
Tambra
5 months ago
Okay, so the calls aren't reaching the Expressway-C. I'm wondering if the transport protocol on the Expressway-C Traversal Client zone needs to be configured for TCP instead of the default.
upvoted 0 times
...
Daryl
9 months 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*
upvoted 0 times
...
Lavera
9 months 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!
upvoted 0 times
Alysa
8 months ago
Yeah, 4 bytes is definitely the right choice. Let's see what the next question is.
upvoted 0 times
...
Catalina
9 months ago
Imagine if it was only 1 byte, that would be a disaster!
upvoted 0 times
...
Sharen
9 months ago
I agree, 4 bytes is the correct size for the TCP sequence number.
upvoted 0 times
...
...
Karima
10 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!
upvoted 0 times
Mollie
9 months ago
I agree, D) 4 bytes seems like the correct answer for the TCP sequence number size.
upvoted 0 times
...
Quentin
9 months ago
I'm not sure, but I'll go with D) 4 bytes as well. It seems like the most logical choice.
upvoted 0 times
...
Rosann
9 months ago
I think it's D) 4 bytes too. It makes more sense for a sequence number.
upvoted 0 times
...
...
Malcom
10 months ago
Ah, the old TCP sequence number question. I remember this from my networking classes. Gotta be 4 bytes, no doubt about it!
upvoted 0 times
Michel
9 months ago
Agreed, 4 bytes is the correct size.
upvoted 0 times
...
Nakita
9 months ago
Definitely 4 bytes, no question about it.
upvoted 0 times
...
Wilda
9 months ago
Yeah, 4 bytes for sure, that's the standard.
upvoted 0 times
...
Skye
10 months ago
I think it's 4 bytes too, makes sense.
upvoted 0 times
...
...
Idella
10 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.
upvoted 0 times
Desiree
9 months ago
I agree, D) 4 sounds right.
upvoted 0 times
...
Alfreda
10 months ago
I think it's D) 4
upvoted 0 times
...
...
Sheridan
11 months ago
I agree, the TCP sequence number is typically 4 bytes long.
upvoted 0 times
...
Tesha
11 months ago
I think it's 4 bytes.
upvoted 0 times
...
Sheridan
11 months ago
What is the size of the TCP sequence number in the header?
upvoted 0 times
...

Save Cancel