Free certification practice questions
Pick an exam and answer ten questions right now — no account, no card, no email address. Every one comes with the full explanation, including why each wrong option is wrong.
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A company runs a reporting application on a single EC2 instance. The reports are generated overnight and the application is idle for the rest of the day. Interruptions are acceptable provided the job finishes before 07:00. Which purchase option gives the lowest cost?
- A 1-year All Upfront Reserved Instance.
- Spot Instances managed by an Auto Scaling group.Correct
- On-Demand Instances with a scheduled start.Your answer
- A Compute Savings Plan with a 3-year commitment.
Purchase options are decided by two questions: is the workload interruptible, and is the usage steady? “Interruptions are acceptable” is the sentence that settles this one, and it is the phrase to look for.
- cOn-Demand Instances with a scheduled start.You picked this
Better than a Reserved Instance here, because it only pays for the hours used — but it pays full price for every one of them when the workload qualifies for Spot.
- bSpot Instances managed by an Auto Scaling group.Correct
Correct. The workload tolerates interruption and has slack in its window, which is precisely what Spot is priced for — up to about 90% below On-Demand.
2 more options explained
- aA 1-year All Upfront Reserved Instance.
A Reserved Instance bills for the whole term whether the instance runs or not. Paying for 24 hours a day to run a job for three is more expensive than On-Demand, not less.
- dA Compute Savings Plan with a 3-year commitment.
Savings Plans commit to an hourly spend for one or three years. Committing for three years to a job that runs three hours a night guarantees paying for the other twenty-one.
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