AWS - Security Groups and Network ACLs
An EC2 instance is associated with the default security group in a VPC. Which inbound traffic is permitted by default?
An EC2 instance is associated with the default security group in a VPC. Which inbound traffic is permitted by default?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand default security group inbound rules
The default security group allows inbound traffic only from instances assigned to the same security group.Step 2: Analyze the options
Traffic from other instances assigned to the same default security group correctly states that inbound traffic is allowed from other instances in the same default security group. Options B and C are incorrect because the default security group does not allow all inbound traffic or SSH from anywhere. No inbound traffic is allowed by default is incorrect because some inbound traffic is allowed.Final Answer:
Traffic from other instances assigned to the same default security group -> Option AQuick Check:
Default security group inbound allows traffic from itself only [OK]
Quick Trick: Default SG inbound allows traffic only from itself [OK]
Common Mistakes:
- Assuming default SG allows all inbound traffic
- Believing default SG allows inbound SSH from anywhere
- Thinking no inbound traffic is allowed by default
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