Deal of The Day! 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 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?

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 Nguyet at Jan 13, 2025, 09:18 PM

Limited Time Offer

25%

Off

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

Contribute your Thoughts:

Submit Cancel
Katheryn
12 days 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!
upvoted 0 times
Lucina
2 days ago
I agree, D) 502 is the correct port for Modbus TCP.
upvoted 0 times
...
...
Lavonda
13 days ago
I'm not sure, but I'll go with D) 502 as well.
upvoted 0 times
...
Carri
16 days ago
I agree with Gearldine, port 502 is used for Modbus TCP communication.
upvoted 0 times
...
Gearldine
18 days ago
I think the correct answer is D) 502.
upvoted 0 times
...
Allene
18 days 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.
upvoted 0 times
Craig
4 days ago
A) 205 - I think it's D) 502, that's the correct port for Modbus TCP.
upvoted 0 times
...
...
Sherman
1 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.
upvoted 0 times
Rodolfo
1 days ago
B) 405
upvoted 0 times
...
Emelda
6 days ago
A) 205
upvoted 0 times
...
...
Joaquin
1 months ago
Port 502? That's a no-brainer! Modbus TCP uses the same port as the original Modbus protocol. Easy peasy!
upvoted 0 times
Alita
6 days ago
That's correct! Port 502 is used for communications in Modbus TCP.
upvoted 0 times
...
Selma
17 days ago
Port 502 is the correct answer. It's the same port as the original Modbus protocol.
upvoted 0 times
...
Chana
18 days ago
Yes, you're right! Modbus TCP uses port 502.
upvoted 0 times
...
...

Save Cancel