CAS-004 Security Architecture Practice Question
A security architect is designing a zero-trust architecture for a multi-cloud environment. Which principle is essential for enforcing identity-centric micro-segmentation?
⚠ Common exam trap
The trap is equating network controls (VPNs, firewalls, NAT) with zero-trust — candidates pick perimeter firewalls because they 'segment the network,' but zero-trust requires identity-based, per-request authorization, not location-based trust.
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
✓
Identity-based access policies
Identity-based access policies are essential for zero-trust micro-segmentation because they authorize every request based on the verified identity of the user, device, or workload — not on network location. In a multi-cloud zero-trust model, policy decisions follow the identity (via IAM, OIDC, SPIFFE, or mTLS) so that workloads are segmented by who they are, not where they sit. This is the core of identity-centric micro-segmentation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Identity-based access policies
Why this is correct
Identity-based access policies evaluate each request against user identity and context rather than network location, which is what enables micro-segmentation to be enforced per identity across multiple clouds. Network-centric controls alone cannot deliver identity-centric segmentation in a multi-cloud estate.
- ✗
VPN concentrators
Why it's wrong here
VPN concentrators grant broad network-level access after authentication, which contradicts the per-request, identity-based segmentation zero trust requires. They are tempting because they do encrypt remote traffic and authenticate users, and would suit connecting a remote workforce to a corporate network, but they cannot enforce micro-segmentation between workloads.
- ✗
Network address translation
Why it's wrong here
NAT rewrites IP addresses and ports for routing and address conservation; it carries no identity context, so it cannot enforce identity-centric micro-segmentation. It is tempting because it segments address space and hides internal topology, and would be correct for exposing internal services or conserving public IPv4 addresses, not for policy based on workload identity.
- ✗
Perimeter firewalls
Why it's wrong here
Perimeter firewalls enforce coarse network-boundary rules on IP addresses and ports, which contradicts identity-centric micro-segmentation that authorises each workload-to-workload flow by verified identity. Identity-aware proxies or service meshes enforce that model. Perimeter firewalls remain correct for traditional north-south boundary filtering.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This CAS-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAS-005 exam.