CAS-004 Security Architecture Practice Question
A security architect is designing a zero trust architecture for a financial institution. Which principle is fundamental to the zero trust model?
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
✓
Assume breach and verify explicitly
Zero trust assumes no implicit trust based on network location; all access requests must be authenticated and authorized regardless of origin. Micro-segmentation and identity-centric controls support this, but the core principle is 'trust no one by default'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Trust but verify all network traffic
Why it's wrong here
Zero trust does not start with trust; it assumes breach and verifies explicitly.
- ✗
Use VPNs for all remote access
Why it's wrong here
VPNs are not a core zero trust principle; zero trust often replaces VPNs with software-defined perimeters.
- ✗
Perimeter-based security is sufficient
Why it's wrong here
Zero trust de-emphasizes the perimeter and focuses on per-request verification.
- ✓
Assume breach and verify explicitly
Why this is correct
This is the foundational principle of zero trust: never trust, always verify.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.