ISC Systems Security Engineering Foundations Practice Question
When designing a system for 'High Integrity' (using the Biba model), which THREE rules must be enforced?
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
✓
Simple Integrity Axiom (No Read Down)
Biba is the dual of Bell-LaPadula: No Read Down (integrity) and No Write Up (integrity).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Simple Integrity Axiom (No Read Down)
Why this is correct
This prevents reading less-trusted information.
- ✓
Integrity Star (*) Axiom (No Write Up)
Why this is correct
This prevents writing information to a higher-integrity level.
- ✗
No Write Down
Why it's wrong here
This is a Bell-LaPadula rule, not Biba.
- ✓
Invocation Property
Why this is correct
This restricts subjects from invoking services at higher integrity levels.
- ✗
No Read Up
Why it's wrong here
This is a Bell-LaPadula rule, not Biba.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.