Exam AWS Certified Data Engineer - Associate DEA-C01 topic 1 question 44 discussion

CCCCCCC - you need to attach an extra EBS volume When an instance terminates, the value of the DeleteOnTermination attribute for each attached EBS volume determines whether to preserve or delete the volume. By default, the DeleteOnTermination attribute is set to True for the root volume. ref: https://repost.aws/knowledge-center/deleteontermination-ebs

C is correct

When an instance terminates, the value of the DeleteOnTermination attribute for each attached EBS volume determines whether to preserve or delete the volume. By default, the DeleteOnTermination attribute is set to True for the root volume.

Check in the option B and C the default settings are mentioned. By default an EC2 instance whenever terminates, its root volume also gets terminated. So launch new EC2 instances by using an AMI that is backed by an EC2 instance store volume. Attach an Amazon Elastic Block Store (Amazon EBS) volume to contain the application data. Apply the default settings to the EC2 instances.

B: by default, delete on termination is checked

By using an AMI backed by an Amazon EBS root volume, you ensure that the application data is preserved, even if the EC2 instances are terminated, because EBS volumes persist independently of the EC2 lifecycle.

This is because Amazon EBS volumes are persistent, meaning the data is preserved even if the EC2 instance is terminated, which meets the requirement to persist the data. C is incorrect because it suggests launching instances using an EC2 instance store volume, which is ephemeral. Even though it proposes attaching an Amazon EBS volume for data, the root volume remains an instance store.

Using default setting means B won’t work.

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/preserving-volumes-on-termination.html Root volume By default, when you launch an instance the DeleteOnTermination attribute for the root volume of an instance is set to true. Therefore, the default is to delete the root volume of the instance when the instance terminates. Non-root volume By default, when you attach a non-root EBS volume to an instance, its DeleteOnTermination attribute is set to false. Therefore, the default is to preserve these volumes. Answer is C

its C!!! B with default setting will delete the EBS volume on termination

Amazon EBS volumes provide persistent block storage for EC2 instances. Data written to an EBS volume is independent of the EC2 instance lifecycle. Even if the EC2 instance is terminated, ***the data on the EBS volume remains intact***. Launching new EC2 instances from an AMI backed by an EBS volume containing the application data ensures the data persists across instance restarts or terminations

launch EC2 using AMI with root EBS that contains data

B: the root EBS volume will be deleted on termination by default. C: the EBS is independent from EC2 Termination

C - Looks better, because it will save data in all cases

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Can someone explain why C is NOT right?

This question is more for practitioner exam :)