Discuss EC-Council ICS-SCADA Exam Topic 5 Question 9

How many firewalls are there in the most common ICS/SCADA architecture?

CNone of these

Suggested Answer: D

The most common ICS/SCADA architecture typically includes two firewalls. This dual firewall configuration often involves one firewall placed between the enterprise network and the ICS/SCADA network, and another between the ICS/SCADA network and the plant floor devices. This arrangement, known as a 'demilitarized zone' (DMZ) between the two firewalls, adds an additional layer of security to help isolate and protect sensitive operational technology (OT) environments from threats originating from IT networks. Reference:

National Institute of Standards and Technology (NIST), 'Guide to Industrial Control Systems (ICS) Security'.

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42 comments · newest first

Coral 10 months ago

Nope, it's usually just 1 in simpler systems.

Terrilyn 11 months ago

Really? I find that hard to believe.

Reita 11 months ago

Definitely 2, that's standard practice.

Vesta 11 months ago

I thought it was 3!

Mabel 11 months ago

Most common ICS/SCADA setups have 2 firewalls.

Louvenia 12 months ago

I’m leaning towards three firewalls based on what I practiced, but I might be mixing it up with another topic.

Rolland 12 months ago

I feel like I saw a practice question that mentioned one firewall being common, but that seems too low for security.

Bettina 12 months ago

I remember studying that there can be multiple firewalls, but I can't recall if it's three or two.

Carry 1 year ago

I think there are usually two firewalls in ICS/SCADA setups, but I’m not entirely sure.

Shalon 1 year ago

Ah, I remember learning about this in class. I believe the standard ICS/SCADA architecture has 2 firewalls, so I'll select option D.

Emmett 1 year ago

The question is asking about the "most common" architecture, so I'm guessing the answer is either 1, 2, or 3 firewalls. I'll eliminate the "None of these" option and try to narrow it down.

Ciara 1 year ago

Hmm, I'm not too familiar with the typical ICS/SCADA setup. I'll have to think this one through carefully before answering.

Mignon 1 year ago

I'm pretty sure the most common ICS/SCADA architecture has 3 firewalls, so I'll go with option A.

Kris 1 year ago

Hmm, this seems like a tricky one. I'll need to carefully read through the options and think about the logical flow of the configuration changes.

Caitlin 1 year ago

Hmm, I'm a bit unsure about this one. FMEA is used in safety-critical systems, but I'm not sure if it's required for all systems. I'll have to think this through carefully.

Adelina 1 year ago

This seems straightforward - I'll start by locating the "Oregon" range and then clearing the contents of the selected cells.

Eun 1 year ago

I'm not entirely sure about this one, but I'll make my best guess and go with option A. Hopefully, that's the right call.

Celestina 2 years ago

I'm feeling confident that the correct answer is D, 2 firewalls. That's the standard configuration I've seen in most industrial control systems.

Brynn 2 years ago

↳ replying to Celestina

I agree with you, D seems like the correct answer.

Shaun 2 years ago

↳ replying to Celestina

I'm not sure, but I think it might be B, 1 firewall.

Carlee 2 years ago

↳ replying to Celestina

I believe it's D, 2 firewalls.

Gregoria 2 years ago

↳ replying to Celestina

I think the answer is A, 3 firewalls.

Candida 2 years ago

Haha, if there were no firewalls, I'd be pretty worried about the security of the ICS/SCADA system! Gotta be at least 1, right?

Shawna 2 years ago

I think the answer is B) 1, as having just one firewall may be sufficient for some ICS/SCADA architectures.

Deonna 2 years ago

I'm not sure, but I think having multiple firewalls would provide better security.

Danilo 2 years ago

Well, I know there's at least 1 firewall, but 3 seems like a lot. Maybe the answer is D, 2 firewalls?

Fairy 2 years ago

↳ replying to Danilo

Yeah, 2 firewalls sounds more reasonable in the common ICS/SCADA architecture.

Caitlin 2 years ago

↳ replying to Danilo

I agree, having 3 firewalls does seem like a lot.

Janessa 2 years ago

↳ replying to Danilo

I think the answer is D, 2 firewalls.

Kristofer 2 years ago

↳ replying to Danilo

Yeah, 2 firewalls sounds more reasonable in the common ICS/SCADA architecture.

Willie 2 years ago

↳ replying to Danilo

I agree, having 3 firewalls does seem like a lot.

Marshall 2 years ago

↳ replying to Danilo

I think the answer is D, 2 firewalls.

Natalie 2 years ago

I disagree, I believe the answer is D) 2.

Lillian 2 years ago

Hmm, I'm going to have to go with 'None of these'. I think the number can vary depending on the specific architecture.

Catalina 2 years ago

↳ replying to Lillian

I'm going with 'None of these'.

Brice 2 years ago

↳ replying to Lillian

I think it's 2.

Huey 2 years ago

I'm pretty sure it's 2 firewalls. That's what I remember from my ICS/SCADA security training.

Kristofer 2 years ago

↳ replying to Huey

Great, thanks for confirming!

Mira 2 years ago

↳ replying to Huey

Yes, 2 firewalls is the correct answer.

Alesia 2 years ago

↳ replying to Huey

I remember learning that too.

Gussie 2 years ago

↳ replying to Huey

I think it's 2 firewalls.

Crista 2 years ago

I think the answer is A) 3.

EC-Council ICS-SCADA Exam - Topic 5 Question 9 Discussion