Learn how to design a reference architecture for three-tier applications with high availability and disaster recovery capabilities. Utilize Amazon Route 53 failover routing, a global table in Amazon DynamoDB, and a hot standby model with Auto Scaling groups to ensure efficient and reliable application performance.
Table of Contents
Question
A solutions architect needs to define a reference architecture for a solution for three-tier applications with web. application, and NoSQL data layers. The reference architecture must meet the following requirements:
- High availability within an AWS Region
- Able to fail over in 1 minute to another AWS Region for disaster recovery
- Provide the most efficient solution while minimizing the impact on the user experience
Which combination of steps will meet these requirements? (Choose three.)
A. Use an Amazon Route 53 weighted routing policy set to 100/0 across the two selected Regions. Set Time to Live (TTL) to 1 hour.
B. Use an Amazon Route 53 failover routing policy for failover from the primary Region to the disaster recovery Region. Set Time to Live (TTL) to 30 seconds.
C. Use a global table within Amazon DynamoDB so data can be accessed in the two selected Regions.
D. Back up data from an Amazon DynamoDB table in the primary Region every 60 minutes and then write the data to Amazon S3. Use S3 cross-Region replication to copy the data from the primary Region to the disaster recovery Region. Have a script import the data into DynamoDB in a disaster recovery scenario.
E. Implement a hot standby model using Auto Scaling groups for the web and application layers across multiple Availability Zones in the Regions. Use zonal Reserved Instances for the minimum number of servers and On-Demand Instances for any additional resources.
F. Use Auto Scaling groups for the web and application layers across multiple Availability Zones in the Regions. Use Spot Instances for the required resources.
Answer
B. Use an Amazon Route 53 failover routing policy for failover from the primary Region to the disaster recovery Region. Set Time to Live (TTL) to 30 seconds.
C. Use a global table within Amazon DynamoDB so data can be accessed in the two selected Regions.
E. Implement a hot standby model using Auto Scaling groups for the web and application layers across multiple Availability Zones in the Regions. Use zonal Reserved Instances for the minimum number of servers and On-Demand Instances for any additional resources.
Explanation
To meet the requirements of high availability within an AWS Region, failover to another AWS Region for disaster recovery, and provide an efficient solution with minimal impact on the user experience, the solutions architect should follow these steps:
B. Use an Amazon Route 53 failover routing policy: Configure a failover routing policy in Amazon Route 53 to direct traffic from the primary Region to the disaster recovery Region in case of a failure. By setting the Time to Live (TTL) to 30 seconds, failover can occur within a minute.
C. Use a global table within Amazon DynamoDB: Create a global table in Amazon DynamoDB that spans both the primary Region and the disaster recovery Region. This ensures that data can be accessed and replicated across the two Regions, providing high availability and disaster recovery capabilities.
E. Implement a hot standby model using Auto Scaling groups: Set up Auto Scaling groups for the web and application layers across multiple Availability Zones in both the primary and disaster recovery Regions. Use zonal Reserved Instances for the minimum required servers to save costs and On-Demand Instances for any additional resources needed. This hot standby model ensures that the infrastructure is ready to handle the workload and can quickly take over in case of a failure.
By combining these steps, you can achieve high availability within an AWS Region, failover to another AWS Region for disaster recovery, and provide an efficient solution with minimal impact on the user experience.
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