AWS (Amazon Web Services) Certification Practice Exam

What is the main characteristic of On-Demand Capacity Reservations?

1. They are temporary and flexible according to demand

2. They require full upfront payment

3. They allow reservations based on pricing bids

4. They allow reservations for specific instance types in a chosen availability zone

The correct answer is: They allow reservations for specific instance types in a chosen availability zone

On-Demand Capacity Reservations are designed to ensure that users can reserve capacity for specific instance types in designated availability zones. This characteristic allows organizations to guarantee that necessary resources will be available when they need them, which is particularly important for applications with unpredictable workloads or for systems that require a certain level of resource availability. This feature is beneficial for enterprises that anticipate high usage during specific periods but want the flexibility of the on-demand model. Users can reserve capacity without the long-term commitment associated with other offerings, allowing them to achieve both reservation of resources and the flexibility to scale as their demand changes. By guaranteeing availability of the selected resources in the specific availability zones, users can plan their deployments with more confidence, knowing that they won't encounter capacity constraints during peak usage times. This ability to reserve specific instance types also ensures that deployments match the technical requirements of the applications being run.