This CCSP practice question tests your understanding of cloud application security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security analyst is reviewing application logs and notices that a large number of requests from a single IP address are attempting to access a REST API endpoint with invalid session tokens. Which cloud-based mitigation is MOST effective at blocking such automated attacks?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a web application firewall (WAF) with rate limiting and IP blacklisting
Option C is correct because a Web Application Firewall (WAF) with rate limiting and IP blacklisting directly addresses the described attack: a single IP flooding a REST API with invalid session tokens. Rate limiting throttles the number of requests from that IP, while IP blacklisting blocks it entirely, preventing automated brute-force or credential-stuffing attempts at the cloud edge before they reach the application.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Rotate API keys more frequently
Why it's wrong here
API keys do not prevent automated attacks; they can be stolen or reused.
CORS affects browser-based requests, not server-side automated tools.
✓
Configure a web application firewall (WAF) with rate limiting and IP blacklisting
Why this is correct
WAF can detect and block malicious traffic patterns.
Related concept
Read the scenario before looking for a memorised answer.
✗
Require encryption of session tokens
Why it's wrong here
Encryption does not address the validity of tokens; invalid tokens still cause errors.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse session token management (e.g., rotation, encryption) with the need for a perimeter defense that controls request volume and source, leading them to pick options that address token validity rather than the automated, high-volume nature of the attack.
Detailed technical explanation
How to think about this question
Under the hood, a WAF operates at Layer 7 (application layer) and can inspect HTTP request headers, body, and URI patterns to detect anomalies. Rate limiting is typically implemented using token bucket or leaky bucket algorithms, and IP blacklisting leverages threat intelligence feeds or dynamic blocklists. In a real-world scenario, a single IP launching a credential-stuffing attack against a REST API would be throttled after exceeding a threshold (e.g., 100 requests per minute), and subsequent requests would receive a 429 Too Many Requests or be dropped, preventing resource exhaustion and unauthorized access attempts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cloud Application Security — This question tests Cloud Application Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a web application firewall (WAF) with rate limiting and IP blacklisting — Option C is correct because a Web Application Firewall (WAF) with rate limiting and IP blacklisting directly addresses the described attack: a single IP flooding a REST API with invalid session tokens. Rate limiting throttles the number of requests from that IP, while IP blacklisting blocks it entirely, preventing automated brute-force or credential-stuffing attempts at the cloud edge before they reach the application.
What should I do if I get this CCSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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