CSSLP Secure Software Concepts Practice Question
When implementing the Biba Integrity Model, which operation is restricted for a subject to maintain the integrity of a higher-level object?
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
✓
Read-down
Biba is the inverse of Bell-LaPadula, focusing on integrity. It prevents 'read-down' to ensure a process doesn't ingest corrupted data from a lower level.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Read-up
Why it's wrong here
Read-up is permitted in Biba as it pulls high-integrity data into a lower-integrity level.
- ✗
Write-up
Why it's wrong here
Write-up is prohibited in Biba to prevent corruption of high-integrity objects.
- ✗
Execute-down
Why it's wrong here
Execution is not the primary focus of the Biba read/write constraints.
- ✓
Read-down
Why this is correct
Read-down is prohibited to prevent a high-integrity subject from reading lower-integrity (less trusted) data.
- ✗
Append-down
Why it's wrong here
Append-down is generally allowed in Biba.
About these practice questions
One of 198 original CSSLP practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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 CSSLP 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 CSSLP exam.