[Solved] What does it mean when we say AWS security groups are stateful? — Ans: Return traffic is automatically allowed, even if no outbound rule exists | AWS

AWS - Security Groups and Network ACLs

What does it mean when we say AWS security groups are stateful?

AReturn traffic is automatically allowed, even if no outbound rule exists

BYou must create separate rules for inbound and outbound traffic

CSecurity groups remember user login sessions

DThey block all traffic by default without exceptions

Step-by-Step Solution

Solution:

Step 1: Understand stateful behavior in security groups
Stateful means the security group tracks connections and allows return traffic automatically.
Step 2: Apply this to inbound and outbound rules
If inbound traffic is allowed, the response outbound traffic is automatically allowed without explicit outbound rules.
Final Answer:
Return traffic is automatically allowed, even if no outbound rule exists -> Option A
Quick Check:
Stateful = automatic return traffic allowed [OK]

Quick Trick: Remember: inbound allows return outbound automatically [OK]

Common Mistakes:

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What does it mean when we say AWS security groups are stateful?