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CLF-C02 practice question: Compute purchasing options (1 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.

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A company wants a three-year commitment discount on Amazon EC2 instances.

It expects to move its workloads to a different instance family during the term as its applications change.

Which Reserved Instance type allows that change?

Choose one answer.

  1. A. Standard Reserved Instances, which tie the discount to a fixed instance family
  2. B. Spot Instances, bought on a three-year commitment
  3. C. Convertible Reserved Instances, which can be exchanged for other attributes
  4. D. Zonal Standard Reserved Instances, which reserve capacity in one Availability Zone
Show the answer and explanation

Answer: C

  • A. Wrong: Standard Reserved Instances cannot be exchanged during the term. A planned move to a different instance family would not be covered.
  • B. Wrong: Spot Instances are spare capacity that AWS can reclaim at short notice, and they have no commitment term. They are not a Reserved Instance.
  • C. Right: Convertible Reserved Instances can be exchanged during the term for a new instance family, instance type or tenancy, which covers the planned change. Learn more: Types of Reserved Instances (opens in a new tab)
  • D. Wrong: This combines Standard terms with a single Availability Zone. Standard Reserved Instances cannot be exchanged, so the family change would not be covered.

Explanation

Convertible Reserved Instances trade a little of the discount for flexibility, because they can be exchanged for another instance family during the term. Standard Reserved Instances cannot be exchanged, and Spot Instances carry no commitment at all.

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