A developer reports that their EC2 instance can receive web traffic but cannot download updates from the internet. The security group allows all outbound traffic. What could be the issue in the Network ACL?

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

Correct Answer: The NACL is missing an outbound rule to allow traffic to the internet (0.0.0.0/0)

Because NACLs are stateless, you must define both inbound and outbound rules for communication to succeed....

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Real Exam ScenarioNetwork ACLs

A developer reports that their EC2 instance can receive web traffic but cannot download updates from the internet. The security group allows all outbound traffic. What could be the issue in the Network ACL?

✓ Correct Answer & ExplanationNetwork ACLs

Correct Answer

The NACL is missing an outbound rule to allow traffic to the internet (0.0.0.0/0)

Why This Answer Is Correct

Because NACLs are stateless, you must define both inbound and outbound rules for communication to succeed.

📚 What This Question Tests

This question evaluates your knowledge of Network ACLs — a core concept tested in AWS Certified Solutions Architect – Associate (SAA-C03). Understanding Network ACLs 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.