The answer is to re-establish correct segmentation between the CDE and corporate network first. This is the priority because a segmentation failure immediately expands the PCI DSS scope—if the boundary is broken, the entire corporate network could be considered part of the cardholder data environment, dramatically increasing the number of systems that must comply with all PCI DSS requirements. On the CompTIA SecurityX CAS-004 exam, this tests your understanding that scope reduction through segmentation is a foundational control; patching vulnerabilities is critical but secondary when the security perimeter itself is compromised. A common trap is to focus on the urgent 30-day remediation deadline for vulnerabilities, but the exam emphasizes that a segmentation failure invalidates the entire compliance boundary. Remember the mnemonic: “Fix the fence before patching the holes”—without segmentation, everything is in scope.
CAS-004 Governance, Risk and Compliance Practice Question
This CAS-004 practice question tests your understanding of governance, risk and compliance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are the compliance officer for a financial institution that must adhere to the Payment Card Industry Data Security Standard (PCI DSS). During a quarterly vulnerability scan, you discover that several critical vulnerabilities in the cardholder data environment (CDE) were not remediated within the required 30-day window. Additionally, the most recent penetration test report shows that a segmentation control between the CDE and the corporate network is not functioning as intended. The next PCI DSS assessment is in two months. Which of the following remediation actions should be prioritized FIRST to maintain compliance?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Re-establish correct segmentation between CDE and corporate network
Option D is correct because fixing the segmentation failure is critical; without proper segmentation, the entire network might be considered in scope, increasing compliance burden. Option A is wrong because patching vulnerabilities is important but the segmentation issue broader. Option B is wrong because compensating controls may be temporary but segmentation is a fundamental requirement. Option C is wrong because delaying assessment is not a remediation.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Implement a compensating control for the segmentation failure and document it
Why it's wrong here
Compensating controls are acceptable but fixing segmentation is primary.
✗
Immediately patch all critical vulnerabilities in the CDE
Why it's wrong here
Important but segmentation issue has larger impact on scope.
✗
Request an extension from the acquirer for the next assessment
Why it's wrong here
Extensions are not guaranteed and do not fix the issues.
✓
Re-establish correct segmentation between CDE and corporate network
Why this is correct
Segmentation is foundational to PCI DSS compliance.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
Governance, Risk and Compliance — This question tests Governance, Risk and Compliance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Re-establish correct segmentation between CDE and corporate network — Option D is correct because fixing the segmentation failure is critical; without proper segmentation, the entire network might be considered in scope, increasing compliance burden. Option A is wrong because patching vulnerabilities is important but the segmentation issue broader. Option B is wrong because compensating controls may be temporary but segmentation is a fundamental requirement. Option C is wrong because delaying assessment is not a remediation.
What should I do if I get this CAS-004 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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