Why does AWS security group outbound rule allowing all traffic to 0.0.0.0/0 not guarantee successful communication?

hard📝 Conceptual Q10 of 15

AWS - Security Groups and Network ACLs

ABecause outbound rules only apply to UDP traffic

BBecause inbound rules on the destination instance may block return traffic

CBecause security groups do not control traffic between instances

DBecause 0.0.0.0/0 is an invalid CIDR block

Step-by-Step Solution

Solution:

Step 1: Understand outbound rule scope
Outbound rule allowing all traffic to 0.0.0.0/0 permits sending traffic anywhere.
Step 2: Consider inbound rules on destination
If the destination instance's inbound rules block the traffic, communication fails.
Final Answer:
Because inbound rules on the destination instance may block return traffic -> Option B
Quick Check:
Inbound rules on destination affect communication success [OK]

Quick Trick: Inbound rules on destination affect communication success [OK]

Common Mistakes:

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