ISC Infrastructure And System Security Practice Question
A security architect needs to implement a WAF to protect an API. Which feature is most critical to prevent BOLA (Broken Object Level Authorization) attacks?
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
✓
API Schema Validation (OpenAPI/Swagger).
BOLA attacks involve manipulating object identifiers in API calls. While a WAF can help, API schema validation and strict parameter checking are critical.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SQL injection filtering.
Why it's wrong here
SQLi filtering does not address logic-based authorization flaws.
- ✗
DDoS rate limiting.
Why it's wrong here
Rate limiting protects availability, not authorization logic.
- ✓
API Schema Validation (OpenAPI/Swagger).
Why this is correct
Validating the structure and parameters helps prevent malicious object ID manipulation.
- ✗
Geo-blocking.
Why it's wrong here
Geo-blocking has no relevance to internal object-level authorization.
About these practice questions
Courseiva writes every ISC question from scratch — 208 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.