How do Network ACLs differ from Security Groups in terms of rule evaluation?

Direct Answer (Verified)Reviewed by Sunny (Senior Cloud Engineer)

Correct Answer: NACLs evaluate rules in numerical order; Security Groups evaluate all rules and allow if there's a match

Network ACLs process rules starting from the lowest number, while Security Groups aggregate all rules (implicit 'deny' for anything not matched)....

📋Part of AWS Certified Solutions Architect – Associate (SAA-C03) · AWS Certification Practice
Real Exam ScenarioSecurity Groups

How do Network ACLs differ from Security Groups in terms of rule evaluation?

✓ Correct Answer & ExplanationSecurity Groups

Correct Answer

NACLs evaluate rules in numerical order; Security Groups evaluate all rules and allow if there's a match

Why This Answer Is Correct

Network ACLs process rules starting from the lowest number, while Security Groups aggregate all rules (implicit 'deny' for anything not matched).

📚 What This Question Tests

This question evaluates your knowledge of Security Groups — a core concept tested in AWS Certified Solutions Architect – Associate (SAA-C03). Understanding Security Groups is essential for designing scalable, secure, and cost-effective cloud architectures. Mastery of this topic will help you answer scenario-based questions confidently on exam day.