ACloud Guru Certified Cloud Practitioner Practice Exam

Which AWS services provide automatic replication across Availability Zones?

1. VPC and EC2

2. DynamoDB and S3

3. IAM and RDS

4. ElastiCache and AWS Lambda

The correct answer is: DynamoDB and S3

DynamoDB and S3 are designed to automatically replicate data across multiple Availability Zones, which enhances their durability and availability. For DynamoDB, data is stored across multiple facilities, and the service ensures that the data remains secure and accessible, even in the event of a failure in one of the zones. This replication is built into DynamoDB's architecture to support high availability and resilience. Similarly, Amazon S3 is an object storage service that automatically stores data across multiple geographically separated locations within a region. This replication not only helps in preventing data loss due to zonal failures but also ensures that the data can be accessed with minimal latency, as it is available from multiple zones within the region. In contrast, the other services mentioned do not offer built-in automatic replication across Availability Zones. While RDS does support multi-AZ deployments, that feature needs to be explicitly configured, and it does not apply to all service types in the same way as DynamoDB and S3. VPC is primarily a networking service, and IAM focuses on access management without data replication concerns. ElastiCache and AWS Lambda do not provide automatic replication across zones as part of their core functionalities. Therefore, DynamoDB and S3 stand out as the correct answer for automatic data replication across