DOP-C02 Question 135
Select 3Your company runs a high-traffic e-commerce website on AWS. The architecture includes an Application Load Balancer (ALB) distributing requests to a fleet of EC2 instances in multiple Availability Zones. Recently, your team has been tasked with improving resilience and ensuring that the application can withstand a failure of an entire AWS Region. Which of the following solutions should you implement to meet this requirement?
- A
Use Route 53 with latency-based routing to distribute traffic across ALBs in multiple Regions.
- B
Configure Auto Scaling groups for EC2 instances in a single Region with multiple Availability Zones.
- C
Replicate the application's infrastructure in a second Region and configure Route 53 failover routing.
- D
Enable Cross-Region replication for the application's Amazon S3 buckets and use CloudFront as a content delivery layer.
- E
Use AWS Global Accelerator to route traffic between multiple Regions and improve application availability.
Show answer and explanation
Correct answers: A, C, E
Explanation
To improve resilience and withstand a Regional failure, the solution must include a multi-Region architecture. Using Route 53 with latency-based routing and failover routing ensures traffic is directed to the appropriate Region in different scenarios. AWS Global Accelerator further enhances resilience by directing traffic to healthy endpoints across Regions. Auto Scaling within a single Region and S3 replication alone do not address Regional failures, making them insufficient for this requirement.
- A. Correct.
Correct. Route 53 latency-based routing ensures traffic is directed to the Region with the lowest latency, improving resilience and performance across multiple Regions.
- B. Incorrect.
Incorrect. While Auto Scaling in a single Region with multiple AZs provides high availability within the Region, it does not address resilience in the event of a Regional failure.
- C. Correct.
Correct. Replicating the application's infrastructure in a second Region and configuring Route 53 failover routing ensures the application can fail over to a healthy Region during a Regional outage.
- D. Incorrect.
Incorrect. While enabling Cross-Region replication for S3 and using CloudFront improves data availability and performance, it does not address the resilience of the EC2-based application itself.
- E. Correct.
Correct. AWS Global Accelerator provides global traffic management and improves application availability by routing traffic to healthy endpoints across multiple Regions.