AWS - Security Groups and Network ACLs
An EC2 instance is assigned both the default security group and a custom security group that allows inbound SSH from anywhere. What inbound traffic will the instance accept?
An EC2 instance is assigned both the default security group and a custom security group that allows inbound SSH from anywhere. What inbound traffic will the instance accept?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand how multiple security groups combine
Inbound traffic is allowed if any attached security group permits it.Step 2: Analyze the scenario
The custom group allows SSH from anywhere, so inbound SSH is allowed regardless of default group rules.Final Answer:
Inbound traffic allowed by either the default or the custom security group. -> Option DQuick Check:
Security groups combine with OR logic for inbound rules [OK]
Quick Trick: Multiple SGs combine with OR logic for inbound traffic [OK]
Common Mistakes:
MISTAKES- Thinking all groups must allow traffic
- Assuming default SG overrides custom SG
- Believing only one SG applies at a time
Master "Security Groups and Network ACLs" in AWS
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