AWS Solutions Architect Associate Practice Test

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True or False: Reserved instances can be used for multi-AZ deployments.

True
False
Only for single-AZ
Depends on the database engine

The correct answer is: True

The statement is true because Reserved Instances in AWS can indeed be utilized for Multi-AZ (Availability Zone) deployments. Reserved Instances provide a billing discount and the capacity reservation for specified instance types, but they are not tied to a specific Availability Zone. This means that the capacity can be used across multiple Availability Zones within the same region. This feature is particularly beneficial for applications that require high availability and resilience by distributing the workloads across different AZs. When a Multi-AZ deployment is used, such as with Amazon RDS, the primary instance is deployed in one Availability Zone, and a secondary, standby instance is deployed in another. Both instances can leverage Reserved Instances’ cost benefits, thus optimizing operational costs while ensuring that critical applications are highly available. Other options reflect limitations or incorrect assertions regarding the deployment modes of Reserved Instances, as they do not accurately represent the scope of usage across availability zones. This flexibility in utilizing Reserved Instances for Multi-AZ deployments makes them an attractive option for organizations that desire both cost efficiency and high availability.