High availability

Deploying the application in three AWS Regions provides geographic proximity to users, reducing latency. CloudFront delivers cached content at edge locations, while Route 53 latency‑based routing directs requests to the nearest healthy Region. DynamoDB Global Tables replicate data across Regions, and an ALB in each Region ensures load distribution and failover if a Region becomes unavailable.

Amazon RDS Multi‑AZ automatically creates a synchronous standby replica in a different AZ and handles failover without user intervention, providing high availability with minimal management. A single‑AZ instance lacks redundancy, Aurora Serverless does not guarantee multi‑AZ failover in the same way, and DynamoDB is a NoSQL service, not a relational database.

Amazon SQS is a fully managed message queuing service designed specifically to decouple and scale microservices, distributed systems, and serverless applications. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Read each option carefully — distractors on High availability are designed to look plausible.
• !Re-check the exact wording of the question stem before committing to an answer.
• !Watch the qualifiers ("always", "only", "except") that flip a correct-looking option.

Answer each from memory — you'll see instantly whether you're right and why.

Run a focused 10-question mini-mock on High availability and see it stick.