SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 web application for a mobile banking backend is behind an Application Load Balancer. The application must be protected from common SQL injection and cross-site scripting attacks with minimum operational overhead. What should the architect deploy?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS WAF associated with the Application Load Balancer
AWS WAF is a web application firewall that helps protect web applications from common web exploits like SQL injection and cross-site scripting (XSS). By associating an AWS WAF web ACL with the Application Load Balancer, you can filter and monitor HTTP(S) requests based on rules that block these attack patterns, all without managing any infrastructure. This provides the required protection with minimal operational overhead because AWS WAF is a fully managed service that integrates directly with ALB.
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.
✗
Security groups on the application instances
Why it's wrong here
Security groups filter ports and IPs but do not inspect HTTP payloads.
✓
AWS WAF associated with the Application Load Balancer
Why this is correct
AWS WAF can inspect HTTP requests and block common web exploits when associated with an ALB.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network ACLs on the public subnets
Why it's wrong here
Network ACLs are stateless subnet filters and cannot inspect application-layer attacks.
✗
AWS Shield Advanced only
Why it's wrong here
Shield Advanced helps with DDoS protection, not SQL injection or XSS inspection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network-level controls (security groups, NACLs) with application-layer protection, assuming that blocking ports or IP ranges is sufficient to stop web application attacks like SQL injection and XSS.
Detailed technical explanation
How to think about this question
AWS WAF uses managed rule groups (e.g., the AWS Managed Rules for SQL injection and XSS) that inspect the URI, query string, and request body for known attack signatures. Under the hood, the ALB terminates TLS and passes the decrypted HTTP request to the WAF engine, which evaluates the request against the rules before forwarding it to the target group. A real-world scenario where this matters is a mobile banking API that accepts JSON payloads — without WAF, a crafted POST request containing SQL commands in a parameter could bypass network-level controls and reach the database.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: AWS WAF associated with the Application Load Balancer — AWS WAF is a web application firewall that helps protect web applications from common web exploits like SQL injection and cross-site scripting (XSS). By associating an AWS WAF web ACL with the Application Load Balancer, you can filter and monitor HTTP(S) requests based on rules that block these attack patterns, all without managing any infrastructure. This provides the required protection with minimal operational overhead because AWS WAF is a fully managed service that integrates directly with ALB.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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