Replicate an ecommerce stack with CloudFormation, Route 53 latency routing, and a DynamoDB global table

SAP-C02 By islever Editorial Last updated

Determine a new architecture for existing workloads. Design a solution to ensure business continuity. Design reliable and resilient architectures.

Short answer

ADE Use a Region-parameterised CloudFormation template, latency-based routing in Route 53, and a DynamoDB global table with Streams enabled.

Question

A company is using a single AWS Region for its ecommerce website. The website includes a web application that runs on several Amazon EC2 instances behind an Application Load Balancer (ALB). The website also includes an Amazon DynamoDB table. A custom domain name in Amazon Route 53 is linked to the ALB. The company created an SSL/TLS certificate in AWS Certificate Manager (ACM) and attached the certificate to the ALB. The company is not using a content delivery network as part of its design. The company wants to replicate its entire application stack in a second Region to provide disaster recovery, plan for future growth, and provide improved access time to users. A solutions architect needs to implement a solution that achieves these goals and minimizes administrative overhead. Which combination of steps should the solutions architect take to meet these requirements? (Choose three.)
  1. Create an AWS CloudFormation template for the current infrastructure design. Use parameters for important system values, including Region. Use the CloudFormation template to create the new infrastructure in the second Region. Correct Answer
  2. Use the AWS Management Console to document the existing infrastructure design in the first Region and to create the new infrastructure in the second Region.
  3. Update the Route 53 hosted zone record for the application to use weighted routing. Send 50% of the traffic to the ALB in each Region.
  4. Update the Route 53 hosted zone record for the application to use latency-based routing. Send traffic to the ALB in each Region. Correct Answer
  5. Update the configuration of the existing DynamoDB table by enabling DynamoDB Streams. Add the second Region to create a global table. Correct Answer

Key Takeaways

A parameterised CloudFormation template makes the second Region a deployment rather than a rebuild, and DynamoDB global tables replicate the data layer across Regions automatically, so both halves of the stack become multi-Region without a second team maintaining parallel infrastructure by hand.

A single-Region ecommerce site runs a web application on EC2 behind an Application Load Balancer with a DynamoDB table, a custom domain in Route 53, and an ACM certificate on the ALB, with no CDN in the design. The whole stack must be replicated to a second Region for disaster recovery, future growth, and improved user access time with minimal administrative overhead.

Common mistake: Using weighted routing to send fifty percent of traffic to each Region. That is an even split, not a closest-Region decision, so it does not provide the improved access time the requirement asks for, and the ACM certificate is regional so each ALB needs its own certificate anyway.

Expert Analysis

Why the Answer Is Correct

The requirement is a second copy of the entire stack with minimal administrative overhead, and a CloudFormation template with parameters including the Region is what makes that repeatable, so A is correct. Deploying the same template in the second Region reproduces the EC2 instances, the load balancer, and the certificate attachment without anyone rebuilding the environment by hand, which is exactly what minimises administrative effort. For the data layer, enabling DynamoDB Streams and adding the second Region to create a global table makes the table multi-Region with automatic replication, so the replicated stack has a synchronised data layer without a separate replication mechanism, which is why E is correct. For user access time, updating the Route 53 record to use latency-based routing sends each user to the ALB in the Region with the lowest measured latency, which delivers the improved access time requirement, so D is correct. Disaster recovery follows from the second Region existing with a live data replica.

Why the Other Options Are Wrong

B: Documenting the current infrastructure in the console and recreating it in the second Region by hand is exactly the administrative overhead the requirement asks to minimise, and the result is configuration that drifts from the original instead of being reproducible. C: Weighted routing with a fifty percent split sends an equal share of users to each Region regardless of where they are, so users in Europe would still be routed to the other Region half the time and the improved access time goal is not met. It also has no failover semantics, since weighted routing does not automatically move all traffic away from an unhealthy Region the way latency routing with health evaluation does.

Community Comment Notes

The community voted 100 to 0 for A, D, and E, and the top-voted comment explained the combination, with CloudFormation providing repeatable infrastructure deployment, latency-based routing in Route 53 directing users to the nearest Region, and the DynamoDB global table providing the replicated data layer for disaster recovery. Several other commenters independently confirmed the same three options.

Official Reference

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/-global-tables.html

This link opens the official vendor documentation in a new tab.

Community Votes

ADE
100%

100% of anonymous learners picked answer ADE. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 5 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 5

  1. 0b43291 👍 1
    By combining CloudFormation for infrastructure deployment, latency-based routing in Route 53, and creating a global DynamoDB table, the solutions architect can achieve the goals of disaster recovery, future growth, and improved access time while minimizing administrative overhead and ensuring data consistency across both Regions. The other options are either not necessary or do not fully meet the requirements: B. Using the AWS Management Console to document and create the infrastructure manually would be time-consuming and prone to human error, increasing administrative overhead. C. Using weighted routing in Route 53 would distribute traffic based on predefined weights, which may not provide the best user experience or account for future growth or changes in traffic patterns. F. Creating a new DynamoDB table and copying data as a one-time operation would not provide continuous replication and could lead to data inconsistencies or data loss in case of a Regional outage.
  2. AzureDP900 👍 1
    ADE is best option for given scenario.
  3. mifune 👍 1
    A-D-E makes more sense to me here
  4. awsaz 👍 3
    A and D And E
  5. NoinNothing 👍 2
    A, D , E is correct

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