Exams / CLF-C02 / Compute purchasing options / Question 2
CLF-C02 practice question: Compute purchasing options (2 of 2)
Billing, Pricing, and Support A free question from our original CLF-C02 practice exam. Try it, then open the answer to see why each option is right or wrong.
A company must be certain that it can launch a set number of Amazon EC2 instances of a specific type in one Availability Zone during a planned two-week event. It does not want a one-year or three-year commitment. Which option should it use?
Choose one answer.
- AA. On-Demand Capacity Reservations in that zone
- BB. Spot Instances in that Availability Zone
- CC. Compute Savings Plans for the event
- DD. Regional Reserved Instances for the Region
Show the answer and explanation
Answer: A
- A. Right: Correct. Capacity Reservations reserve capacity in a specific Availability Zone for any duration, and immediate-use reservations have no term commitment.
- B. Wrong: Spot Instances can be interrupted when EC2 needs the capacity back, so they cannot guarantee capacity.
- C. Wrong: Savings Plans give a discount for a one- or three-year spend commitment. They do not reserve capacity.
- D. Wrong: Regional Reserved Instances need a one- or three-year term and give a billing discount without reserving capacity in a specific Availability Zone.
Explanation
On-Demand Capacity Reservations guarantee EC2 capacity in a specific Availability Zone for as long as you need, and immediate-use reservations can be cancelled at any time. They give no discount by themselves, but can be combined with Savings Plans or Regional Reserved Instances for one. Commitment-based options such as Savings Plans lower the price but do not reserve capacity.
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