[Solved] Which statement correctly describes how NACLs handle return traffic? — Ans: Return traffic must be explicitly allowed by outbound rules. | AWS

AWS - Security Groups and Network ACLs

Which statement correctly describes how NACLs handle return traffic?

AReturn traffic must be explicitly allowed by outbound rules.

BReturn traffic is automatically allowed by default.

CReturn traffic is blocked unless a security group allows it.

DReturn traffic is only allowed if it matches the inbound rule.

Step-by-Step Solution

Solution:

Step 1: Recall NACL statelessness
NACLs do not remember previous packets, so return traffic is not automatically allowed.
Step 2: Understand outbound rule necessity
Return traffic must have an explicit outbound rule to be allowed through the NACL.
Final Answer:
Return traffic must be explicitly allowed by outbound rules. -> Option A
Quick Check:
Return traffic requires outbound rule = true [OK]

Quick Trick: Return traffic needs outbound rule, no auto-allow [OK]

Common Mistakes:

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Which statement correctly describes how NACLs handle return traffic?