CLF-C02 Question 287
Select 3A company is planning to use Amazon EC2 Reserved Instances to save costs on their consistent workloads. Which of the following statements correctly describe the flexibility offered by Reserved Instances?
- A
Reserved Instances allow you to modify the Availability Zone, instance size (within the same instance family), and scope of your reservation.
- B
Reserved Instances can be applied automatically to matching instances, even if they are part of an Auto Scaling group.
- C
Reserved Instances allow you to change the instance type to any other instance type within AWS at no extra cost.
- D
Reserved Instances provide flexibility to switch between Linux and Windows operating systems for the same reservation.
- E
Convertible Reserved Instances allow you to exchange your reservation for a different instance family or tenancy.
Show answer and explanation
Correct answers: A, B, E
Explanation
Reserved Instances provide cost savings for consistent workloads and offer some flexibility, such as modifying the Availability Zone, instance size within the same instance family, and scope. Convertible Reserved Instances specifically allow exchanges for different configurations, including instance families and tenancies. However, Reserved Instances do not support changing operating systems or general instance types beyond the same family.
- A. Correct.
This is correct. Reserved Instances provide some flexibility, such as modifying the Availability Zone, instance size within the same family, and scope (zonal or regional).
- B. Correct.
This is correct. Reserved Instances are automatically applied to matching instances, whether launched manually or through an Auto Scaling group, as long as the specifications match the reservation.
- C. Incorrect.
This is incorrect. Reserved Instances do not allow changing the instance type to any other type. Modifications are limited to instance size within the same instance family.
- D. Incorrect.
This is incorrect. Reserved Instances are tied to a specific operating system and do not provide flexibility to switch between Linux and Windows.
- E. Correct.
This is correct. Convertible Reserved Instances allow you to exchange your reservation for a different instance family, operating system, or tenancy if your needs change.