CAS-004 Security Architecture Practice Question
Which of the following is a key principle of the zero trust security 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
✓
Never trust, always verify
Zero trust operates on the principle of never trust, always verify, requiring continuous authentication and authorization for every access request, regardless of location.
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 all internal traffic
Why it's wrong here
Zero trust does not automatically trust internal traffic.
- ✗
Verify once, trust forever
Why it's wrong here
Zero trust requires continuous verification.
- ✗
Trust but verify
Why it's wrong here
This is a traditional security model, not zero trust.
- ✓
Never trust, always verify
Why this is correct
The zero trust model enforces authentication and authorisation at every access request, regardless of network location, by requiring continuous verification of identity, device health, and session context before granting resource access. This satisfies the stem’s requirement for a foundational principle, as it directly opposes the traditional perimeter-based trust model. In Microsoft Entra ID, conditional access policies implement this by evaluating real-time signals for each request.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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