CAS-004 Security Architecture Practice Question
An organization wants to implement infrastructure as code (IaC) with immutable infrastructure. Which security benefit does immutable infrastructure provide?
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
✓
Reduced attack surface due to consistent configurations
Immutable infrastructure enforces that servers are never modified after deployment; updates are made by replacing the entire server, reducing configuration drift and vulnerabilities.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Better performance through caching
Why it's wrong here
Performance is not a direct security benefit.
- ✓
Reduced attack surface due to consistent configurations
Why this is correct
Immutable infrastructure ensures consistent, known-good configurations, reducing drift and vulnerabilities.
- ✗
Simpler network segmentation
Why it's wrong here
Network segmentation is independent of immutability.
- ✗
Easier patch management
Why it's wrong here
Patching is done by redeploying a new image, not by applying patches to running systems.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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