Questions 25 to 27

Explanations for questions 25 to 27

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Question 25

A solutions architect is attempting to clean up unused EBS volumes and snapshots to save some space and cost. How many of the most recent snapshots of an EBS volume need to be maintained to guarantee that you can recreate the full EBS volume from the snapshot?

  1. You must retain all snapshots as the process is incremental.
  2. Two snapshots, the oldest and most recent snapshots
  3. The oldest snapshot, as this references data in all other snapshots
  4. Only the most recent snapshot: snapshots are incremental, but the deletion process will ensure that no data is lost.

Correct Answer: 4

Explanation: Snapshots capture a point-in-time state of an instance. If you make periodic snapshots of a volume, the snapshots are incremental, which means that only the blocks on the device that have changed after your last snapshot are saved in the new snapshot.

Even though snapshots are saved incrementally, the snapshot deletion process is designed so that you need to retain only the most recent snapshot to restore the volume.

INCORRECT: “You must retain all snapshots as the process is incremental.” is incorrect as explained above.

INCORRECT: “Two snapshots, the oldest and most recent snapshots” is incorrect as explained above.

INCORRECT: “The oldest snapshot, as this references data in all other snapshots” is incorrect as explained above.

CORRECT: “Only the most recent snapshot: snapshots are incremental, but the deletion process will ensure that no data is lost.” is the correct answer.

References: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-deleting-snapshot.html

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