Crucial Exams

AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

A DevOps engineer rotated a customer-managed KMS key alias that encrypts the Amazon EBS root volume of an Auto Scaling group. The alias now points to a new CMK, and the original CMK is disabled. New EC2 instances launch, but existing instances fail to start because their root volumes cannot be decrypted. What is the MOST operationally efficient way to restore the affected instances?

  • Copy every existing snapshot to the new CMK and launch replacement instances from the copied snapshots.

  • Re-enable the disabled CMK to allow KMS to decrypt the existing volumes, then start the instances.

  • Detach each root volume, create an unencrypted snapshot, then re-encrypt the snapshot with the new CMK and reattach the volume.

  • Update the launch template to reference the new CMK and perform an instance refresh on the Auto Scaling group.

AWS Certified CloudOps Engineer Associate SOA-C03
Security and Compliance
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