- A
A rate-based rule that blocks clients exceeding a request threshold from the same source IP.
Rate-based rules are the native WAF feature for detecting and blocking unusually high request rates from the same IP or set of IPs. This helps stop bursts that can indicate abuse or application-layer flooding.
- B
An AWS Managed Rules group for common web exploits.
AWS Managed Rules provide maintained rule sets for common threats such as injection patterns and known-bad request signatures. They add broad protection without requiring the team to write and maintain custom logic.
- C
ALB sticky sessions for all requests.
Why wrong: Sticky sessions help keep a client on the same target, but they do not inspect requests for attacks or block abusive traffic patterns.
- D
A security group rule that blocks requests based on HTTP path.
Why wrong: Security groups operate at the network and port layer. They cannot inspect HTTP paths or implement request-rate controls.
- E
CloudFront origin access control for the API endpoint.
Why wrong: Origin access control is used to restrict access to S3 origins behind CloudFront. It does not provide API abuse protection for an ALB-backed application.
Quick Answer
The answer is an AWS Managed Rules group for common web exploits and a rate-based rule. A rate-based rule automatically tracks the number of requests from a single client IP over a 5-minute sliding window, blocking any source that exceeds a defined threshold—this directly stops repetitive bursts without custom code. The managed rules group, such as the AWS Core Rule Set, provides pre-configured protections against SQL injection, cross-site scripting, and other common web exploits, eliminating the need to write custom signatures. On the SAA-C03 exam, this pairing tests your understanding of how to combine automated traffic shaping with managed threat intelligence, often appearing in scenarios involving CloudFront or ALB. A common trap is confusing rate-based rules with simple IP set blocking; remember that rate-based rules are time-windowed, not static. Memory tip: “Rate for bursts, Managed for exploits.”
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 public API is delivered through CloudFront and an Application Load Balancer. The security team wants AWS to automatically block repetitive bursts from the same client IP and also reduce exposure to common web exploits without custom code. Which two AWS WAF features should be enabled? Select two.
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
A rate-based rule that blocks clients exceeding a request threshold from the same source IP.
A rate-based rule in AWS WAF automatically tracks request rates per source IP and blocks clients that exceed a configured threshold within a 5-minute evaluation window. This directly addresses the security team's requirement to block repetitive bursts from the same client IP without custom code.
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.
- ✓
A rate-based rule that blocks clients exceeding a request threshold from the same source IP.
Why this is correct
Rate-based rules are the native WAF feature for detecting and blocking unusually high request rates from the same IP or set of IPs. This helps stop bursts that can indicate abuse or application-layer flooding.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
An AWS Managed Rules group for common web exploits.
Why this is correct
AWS Managed Rules provide maintained rule sets for common threats such as injection patterns and known-bad request signatures. They add broad protection without requiring the team to write and maintain custom logic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
ALB sticky sessions for all requests.
Why it's wrong here
Sticky sessions help keep a client on the same target, but they do not inspect requests for attacks or block abusive traffic patterns.
- ✗
A security group rule that blocks requests based on HTTP path.
Why it's wrong here
Security groups operate at the network and port layer. They cannot inspect HTTP paths or implement request-rate controls.
- ✗
CloudFront origin access control for the API endpoint.
Why it's wrong here
Origin access control is used to restrict access to S3 origins behind CloudFront. It does not provide API abuse protection for an ALB-backed application.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse security group rules (Layer 3/4) with WAF rules (Layer 7), mistakenly thinking a security group can filter HTTP paths or block application-layer attacks.
Detailed technical explanation
How to think about this question
Rate-based rules use a token bucket algorithm with a 5-minute sliding window; once the request count from a source IP exceeds the threshold, the rule blocks subsequent requests for the remainder of the window. AWS Managed Rules for common web exploits, such as the Core Rule Set (CRS), include signatures for SQL injection, cross-site scripting (XSS), and path traversal, and are updated automatically by AWS to address new vulnerabilities. Combining these two features provides both volumetric and signature-based protection without custom code.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A rate-based rule that blocks clients exceeding a request threshold from the same source IP. — A rate-based rule in AWS WAF automatically tracks request rates per source IP and blocks clients that exceed a configured threshold within a 5-minute evaluation window. This directly addresses the security team's requirement to block repetitive bursts from the same client IP without custom code.
What should I do if I get this SAA-C03 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A public API is served through an Application Load Balancer and protected by AWS WAF. The team wants AWS to automatically block clients that send too many requests from the same IP address within a short time window. Which AWS WAF feature is the best fit?
easy- ✓ A.Use a rate-based rule in AWS WAF to block when requests per IP exceed a configured threshold over the WAF rate-based evaluation window.
- B.Use an AWS IAM policy on the ALB listener to deny requests when request count exceeds a threshold.
- C.Enable S3 server access logs for the bucket that stores API responses and alert on high log volume.
- D.Configure an AWS Lambda authorizer to reject requests after the Nth request from an IP address.
Why A: A rate-based rule in AWS WAF is specifically designed to automatically block clients when the number of requests from a single IP address exceeds a configured threshold within a rolling evaluation window (typically 5 minutes). This feature directly addresses the requirement to mitigate high request rates from the same IP, making it the best fit for the described use case.
Last reviewed: Jun 11, 2026
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services 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 SAA-C03 exam.
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