AWS - Security Groups and Network ACLs
Why does the AWS default security group allow inbound traffic only from instances assigned to itself?
Why does the AWS default security group allow inbound traffic only from instances assigned to itself?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the purpose of default security group inbound rules
The default security group allows inbound traffic from itself to enable safe communication between instances without opening to the internet.Step 2: Evaluate options
To simplify communication between instances in the same group without exposing them externally. correctly explains this design choice as a security measure to simplify internal communication.Final Answer:
To simplify communication between instances in the same group without exposing them externally. -> Option DQuick Check:
Default SG inbound from self = safe internal communication [OK]
Quick Trick: Default SG inbound from self enables safe internal communication [OK]
Common Mistakes:
- Assuming default SG allows all inbound traffic
- Confusing inbound and outbound defaults
- Believing default SG allows inbound on specific ports only
Master "Security Groups and Network ACLs" in AWS
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