AWS (Amazon Web Services) Certification Practice Exam

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What allows you to reserve a specific instance type, platform, and tenancy for a certain period?

Tenancy
Scheduled Instances
On-Demand Capacity Reservations
Spot Instances

The correct answer is: On-Demand Capacity Reservations

The option that allows you to reserve a specific instance type, platform, and tenancy for a certain period is known as On-Demand Capacity Reservations. This feature provides you with the ability to set aside capacity for specific EC2 instance types in a chosen availability zone, ensuring that you can launch your instances when you need them, even during periods of high demand. Capacity Reservations are particularly beneficial in scenarios where you need to comply with regulatory requirements or maintain consistent performance levels, as they guarantee the availability of the resources you require. This differs from other options, such as scheduled instances, which are designed for regular, recurring workloads and let you specify start and end times for instance usage but do not reserve capacity in a way that guarantees it during high-demand times.