SAP-C02 Question 494
Select 3A company runs a critical web application in a single AWS Region using an Auto Scaling group of EC2 instances behind an Application Load Balancer (ALB). They want to improve the application's high availability and resiliency to withstand a complete Regional outage. Which combination of actions should the company take?
- A
Deploy the application across multiple AWS Regions and set up an Amazon Route 53 latency-based routing policy.
- B
Enable Auto Scaling group scaling across multiple Availability Zones within the existing Region.
- C
Configure an Amazon Route 53 failover routing policy to route traffic to a secondary Region when the primary Region becomes unavailable.
- D
Use AWS Global Accelerator to distribute traffic across multiple Regions for low latency and fault tolerance.
- E
Set up an Amazon S3 bucket for static content in the primary Region and enable cross-Region replication.
Show answer and explanation
Correct answers: A, C, D
Explanation
Improving high availability and resiliency requires mitigating the risk of a single point of failure, such as a Regional outage. Deploying the application across multiple Regions with proper routing policies like Route 53 latency-based or failover routing ensures availability even if one Region is down. AWS Global Accelerator further enhances fault tolerance by distributing traffic across Regions. Simply enabling Auto Scaling within a single Region or replicating an S3 bucket does not address Regional outages comprehensively.
- A. Correct.
Deploying the application across multiple AWS Regions and using a latency-based routing policy ensures the application can serve requests from the closest available Region, improving high availability and resiliency.
- B. Incorrect.
Enabling Auto Scaling across multiple Availability Zones improves availability within a single Region but does not address resilience to a Regional outage.
- C. Correct.
Configuring a failover routing policy with Route 53 ensures that traffic is routed to a backup Region when the primary Region becomes unavailable, enhancing resiliency.
- D. Correct.
AWS Global Accelerator can distribute traffic across multiple Regions and provide fault tolerance and low latency, making it a suitable solution for improving high availability and resiliency.
- E. Incorrect.
Cross-Region replication for an S3 bucket helps with data durability and availability for static content but does not directly address the high availability of the web application itself.