CAS-004 Security Architecture Practice Question
A company is implementing API security for its web services. Which THREE of the following are considered best practices for securing APIs? (Select THREE).
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
✓
Validate all input
API security best practices include using OAuth 2.0 for authentication/authorization, implementing rate limiting to prevent abuse, and validating input to prevent injection attacks. WPA3 is for Wi-Fi; symmetric encryption alone is not a complete API security practice.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Rely solely on symmetric encryption for data at rest
Why it's wrong here
Symmetric encryption is not sufficient; asymmetric key management and TLS are needed.
- ✓
Validate all input
Why this is correct
Input validation prevents injection and other attacks.
- ✗
Use WPA3 for transport encryption
Why it's wrong here
WPA3 is for Wi-Fi, not API transport; use TLS.
- ✓
Implement rate limiting
Why this is correct
Rate limiting prevents denial-of-service and brute-force attacks.
- ✓
Use OAuth 2.0 for authorization
Why this is correct
OAuth 2.0 is a standard for token-based API authorization.
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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.