hardMultiple Choice
CAS-004 Practice Question: A multinational organization is adopting a zero…
A multinational organization is adopting a zero trust architecture and needs to align its network segmentation with regulatory requirements. The compliance team has identified that certain data must be isolated to meet PCI DSS scope reduction. Which of the following design approaches BEST supports both zero trust and PCI DSS compliance?
⚠ Common exam trap
CompTIA often tests the misconception that VLANs are sufficient for security segmentation, but the trap here is that VLANs lack the identity-aware, dynamic policy enforcement and east-west traffic control required by zero trust, and they do not provide the auditable, scope-reducing isolation that PCI DSS demands.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implementing microsegmentation with software-defined networking
Microsegmentation with software-defined networking (SDN) enables granular, identity-aware isolation of workloads at the virtual network layer, which directly supports zero trust's 'never trust, always verify' principle by restricting lateral movement. For PCI DSS scope reduction, microsegmentation allows the organization to create a logical, auditable boundary around cardholder data environment (CDE) assets without relying on physical network topology, thereby reducing the scope of PCI DSS compliance assessments. This approach is superior because it provides dynamic, policy-driven segmentation that can adapt to regulatory changes while maintaining strict least-privilege access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploying VLANs to separate cardholder data from other traffic
Why it's wrong here
VLANs segment Layer 2 broadcast domains but do not enforce identity-aware, per-flow policy between workloads, which zero trust requires. It is tempting because VLANs are the traditional PCI DSS CDE isolation method, yet they alone cannot deliver microsegmentation.
- ✓
Implementing microsegmentation with software-defined networking
Why this is correct
Microsegmentation with software-defined networking enforces per-workload, identity-based policies at Layer 3–7, isolating cardholder data environment segments to shrink PCI DSS scope. This granular east-west control satisfies zero trust's least-privilege assumption and continuous verification requirements, unlike coarse VLAN or perimeter-based segmentation.
- ✗
Using network access control (NAC) to enforce endpoint compliance
Why it's wrong here
NAC enforces endpoint posture at connection time; it does not isolate cardholder data flows to shrink PCI DSS scope. It is tempting because NAC underpins zero trust access decisions, but segmentation of the CDE requires enforcing policy between workloads, not endpoint admission checks.
- ✗
Placing all systems that process cardholder data in a DMZ
Why it's wrong here
A DMZ isolates internet-facing services, not internal cardholder data systems, and does not provide east-west microsegmentation. It is tempting because DMZs are a recognised PCI DSS segmentation control for public-facing components, but placing the whole CDE there misapplies the pattern.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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