DOP-C02 Question 157
Select 3Your company operates a critical web application hosted on Amazon EC2 instances behind an Application Load Balancer (ALB). The application must meet a strict SLA of 99.99% availability, and you need to implement a disaster recovery strategy to minimize downtime in case of a regional failure. Which combination of actions will help you achieve high availability while meeting this SLA?
- A
Deploy the application across multiple Availability Zones within the same Region and set up an Auto Scaling group.
- B
Configure a multi-Region deployment and use Amazon Route 53 with a latency-based routing policy to distribute traffic.
- C
Enable AWS Global Accelerator to route traffic to the nearest healthy Region automatically.
- D
Rely on a single Region with Multi-AZ deployments and use Amazon CloudWatch for monitoring.
- E
Implement a backup and restore strategy by periodically copying application data to an S3 bucket in another Region.
Show answer and explanation
Correct answers: A, B, C
Explanation
To achieve high availability and meet a 99.99% SLA, you must deploy your application in a fault-tolerant architecture. This includes using Multi-AZ deployments for resilience within a Region and implementing a multi-Region strategy for disaster recovery. Route 53's latency-based routing and AWS Global Accelerator enhance availability by ensuring traffic is routed to the nearest healthy Region. Relying on a single Region or backup and restore strategies alone does not meet the high availability requirements.
- A. Correct.
Deploying the application across multiple Availability Zones in the same Region ensures high availability within that Region, as workloads can failover between AZs in case of an outage.
- B. Correct.
A multi-Region deployment with Amazon Route 53 latency-based routing policy ensures that traffic is directed to the closest healthy Region, reducing latency and improving availability during a Regional failure.
- C. Correct.
AWS Global Accelerator automatically routes traffic to the nearest healthy Region, enhancing performance and availability for global users during Regional outages.
- D. Incorrect.
Relying solely on a single Region with Multi-AZ deployments does not meet the requirement for disaster recovery in the event of a complete Regional failure.
- E. Incorrect.
A backup and restore strategy can help recover application data, but it does not provide the immediate high availability required to meet the 99.99% SLA.