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You tried to delete the default security group in your VPC but received an error. What is the most likely reason?

medium📝 Debug Q14 of 15
AWS - Security Groups and Network ACLs
You tried to delete the default security group in your VPC but received an error. What is the most likely reason?
ADefault security groups cannot be deleted.
BYou need to detach all instances before deleting.
CYou must disable all inbound rules first.
DYou need to delete the VPC first.
Step-by-Step Solution
Solution:

  1. Step 1: Understand default security group restrictions

    The default security group cannot be deleted by design in AWS.

  2. Step 2: Evaluate other options

    Detaching instances or disabling rules is not sufficient; deleting VPC is unrelated to this error.

  3. Final Answer:

    Default security groups cannot be deleted. -> Option A

  4. Quick Check:

    Default security group deletion blocked = D [OK]
Quick Trick: Default security group cannot be deleted [OK]
Common Mistakes:
  • Trying to delete without detaching instances
  • Thinking disabling rules allows deletion
  • Assuming VPC must be deleted first

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