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. A key principle to apply: aWS WAF operates at Layer 7 (Application Layer) of the OSI model.. 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 IoT ingestion API 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? The design must avoid adding custom operational scripts.
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 match malicious patterns, with no custom scripts or operational overhead. This is the most efficient and managed solution for the stated requirements.
Key principle: AWS WAF operates at Layer 7 (Application Layer) of the OSI model.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
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
AWS WAF operates at Layer 7 (Application Layer) of the OSI model.
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Network ACLs on the public subnets
Why it's wrong here
Network ACLs are stateless subnet filters and cannot inspect application-layer attacks.
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Security groups on the application instances
Why it's wrong here
Security groups filter ports and IPs but do not inspect HTTP payloads.
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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-layer controls (NACLs, security groups) with application-layer protection, or assume Shield Advanced alone covers all web threats, when in fact WAF is specifically designed for Layer 7 attack mitigation like SQLi and XSS.
Detailed technical explanation
How to think about this question
AWS WAF uses managed rule groups (e.g., AWSManagedRulesCommonRuleSet, AWSManagedRulesSQLiRuleSet) that automatically update to protect against the latest OWASP Top 10 threats. When associated with an ALB, WAF inspects each HTTP(S) request before it reaches the backend, allowing you to block, count, or allow traffic based on conditions like URI, query string, or body content. This integration requires no custom code and can be centrally managed across multiple ALBs using AWS Firewall Manager.
KKey Concepts to Remember
AWS WAF operates at Layer 7 (Application Layer) of the OSI model.
AWS WAF can be associated with Application Load Balancers, CloudFront distributions, and API Gateways.
AWS WAF uses rules and rule groups to inspect HTTP/HTTPS requests for malicious patterns.
AWS WAF offers managed rule sets for common web exploits like SQL injection and XSS.
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
AWS WAF operates at Layer 7 (Application Layer) of the OSI model.
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.
Review aWS WAF operates at Layer 7 (Application Layer) of the OSI model., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Secure Architectures — This question tests Design Secure Architectures — AWS WAF operates at Layer 7 (Application Layer) of the OSI model..
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 match malicious patterns, with no custom scripts or operational overhead. This is the most efficient and managed solution for the stated requirements.
What should I do if I get this SAA-C03 question wrong?
Review aWS WAF operates at Layer 7 (Application Layer) of the OSI model., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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?
AWS WAF operates at Layer 7 (Application Layer) of the OSI model.
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