ISC Systems Security Engineering Foundations Practice Question
Which security model is specifically designed to prevent the unauthorized flow of information from high-security levels to low-security levels (no read up, no write down)?
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
✓
Bell-LaPadula model
The Bell-LaPadula model focuses on confidentiality by enforcing the 'no read up, no write down' rules.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Clark-Wilson model
Why it's wrong here
Clark-Wilson focuses on integrity through transaction processing.
- ✓
Bell-LaPadula model
Why this is correct
Bell-LaPadula enforces confidentiality rules.
- ✗
Biba model
Why it's wrong here
Biba focuses on integrity, not confidentiality.
- ✗
Brewer-Nash model
Why it's wrong here
Brewer-Nash addresses conflicts of interest.
About these practice questions
This ISC question is part of Courseiva's 209-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.