ISC Infrastructure And System Security Practice Question
A company is moving to a multi-tenant SaaS environment. To ensure data isolation between tenants at the application layer, what is the most robust strategy?
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
✓
Use Row-Level Security (RLS) within the database engine.
Row-level security (RLS) or tenant-aware database schemas ensure that even if an application query is malformed, the database enforces isolation based on the tenant ID.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use Row-Level Security (RLS) within the database engine.
Why this is correct
RLS provides strong, built-in isolation at the data tier.
- ✗
Use separate VPCs for every tenant.
Why it's wrong here
This is infrastructure isolation, not application-level data isolation.
- ✗
Implement application-level filtering in the code.
Why it's wrong here
This is prone to human error and logic bugs that lead to data leakage.
- ✗
Create separate database instances for every single tenant.
Why it's wrong here
While secure, it is rarely cost-effective or manageable for true multi-tenancy.
About these practice questions
This ISC question is part of Courseiva's 208-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.