ANS-C01 Question 282
Select 3You are designing a multi-region disaster recovery (DR) strategy for a critical application running in AWS. The application uses an Amazon VPC with several subnets, an NLB (Network Load Balancer), and EC2 instances. To ensure failover between regions with minimal downtime, which of the following actions should you take?
- A
Deploy identical infrastructure in the secondary region, including a VPC, subnets, NLB, and EC2 instances.
- B
Configure an Amazon Route 53 health check to monitor the primary region's NLB and failover to the secondary region's NLB if unhealthy.
- C
Use a single VPC stretched across both regions to simplify the architecture and avoid duplicate resources.
- D
Enable AWS Global Accelerator to route traffic based on health checks and latency between regions.
- E
Configure an Amazon S3 bucket in the secondary region to store application logs and trigger failover.
- F
Set up VPC Peering between the primary and secondary regions to ensure seamless communication.
Show answer and explanation
Correct answers: A, B, D
Explanation
For a robust multi-region DR strategy, you need to ensure the secondary region has identical infrastructure to the primary region (Option 1). Route 53 health checks (Option 2) enable automatic failover when the primary region's resources are unhealthy. Additionally, AWS Global Accelerator (Option 4) can enhance failover performance by routing traffic based on health and latency. Options 3, 5, and 6 are either technically infeasible or irrelevant to the DR scenario provided.
- A. Correct.
Deploying identical infrastructure in the secondary region is critical for a DR strategy as it ensures the application can seamlessly operate in the event of a failure in the primary region.
- B. Correct.
Route 53 health checks are necessary to monitor the health of the primary region's resources and trigger failover to the secondary region if those resources become unavailable.
- C. Incorrect.
A single VPC cannot span multiple AWS regions, so this option is not feasible for a multi-region DR strategy.
- D. Correct.
AWS Global Accelerator can help route traffic efficiently between regions, taking into account both health checks and latency, which is ideal for a DR setup.
- E. Incorrect.
Storing application logs in an S3 bucket is a good practice but does not contribute directly to triggering or managing failover in a multi-region DR strategy.
- F. Incorrect.
VPC Peering is used for communication between VPCs and is not relevant to multi-region failover for this type of architecture.