AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A SaaS provider currently runs its entire stack in the us-east-1 Region. Customers are located in North America, Europe, and Asia-Pacific. The product team adds two new requirements:
Decrease round-trip latency for all users and maintain service availability if an AWS Region becomes unavailable.
Comply with regional regulations that require all customer data created in the European Union (EU) to remain in EU infrastructure.
As the solutions architect, which approach best meets both requirements while minimizing ongoing operational overhead?
Retain a single-Region deployment in us-east-1 but add AWS Global Accelerator to improve network paths for TCP and UDP traffic worldwide.
Keep the workload in us-east-1 and place Amazon CloudFront in front of the application to cache static and dynamic content at global edge locations.
Deploy the application stack in eu-central-1 and ap-southeast-2 in addition to us-east-1. Use Amazon Route 53 latency-based routing with health checks to direct users to the nearest healthy Region. Store EU customer data only in eu-central-1 and disable cross-Region replication for those buckets and databases.
Move all compute instances into a cluster placement group in us-east-1 and purchase a 100 Gbps AWS Direct Connect to enhance throughput and latency for every user.
Deploying identical stacks in multiple AWS Regions and using Amazon Route 53 latency-based (or geolocation) routing with health checks fulfills both goals. Each Region serves traffic from the closest users, reducing latency, and EU data can be stored exclusively in the EU Region (for example, eu-central-1) with cross-Region replication disabled, satisfying residency rules. CloudFront or Global Accelerator alone improve network performance but still route dynamic writes to the original Region, violating data-residency. Increasing instance size, placement groups, or dedicated network links also leave the workload single-Region and do not address compliance.
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