CAS-004 Security Architecture Practice Question
During a threat modeling exercise for a new web application, the team identifies a risk of API abuse due to lack of rate limiting. Which security control should be implemented at the API gateway to mitigate this risk?
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
✓
Rate limiting policies
Rate limiting at the API gateway restricts the number of requests per client over a specified time, preventing abuse and DoS attacks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Input validation
Why it's wrong here
Input validation prevents injection attacks but does not limit request volume.
- ✗
OAuth 2.0 scopes
Why it's wrong here
OAuth scopes define permissions, not request frequency.
- ✓
Rate limiting policies
Why this is correct
Rate limiting directly addresses API abuse by throttling requests.
- ✗
JWT token expiration
Why it's wrong here
Token expiration controls session lifetime, not request rate.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.