A Company Has a Three-Tier Application Running on AWS with a Web

question 436

Multiple Choice

A company has a three-tier application running on AWS with a web server, an application server, and an Amazon RDS MySQL DB instance. A solutions architect is designing a disaster recovery (DR) solution with an RPO of 5 minutes. Which solution will meet the company's requirements?

• A) Configure AWS Backup to perform cross-Region backups of all servers every 5 minutes. Reprovision the three tiers in the DR Region from the backups using AWS CloudFormation in the event of a disaster.
• B) Maintain another running copy of the web and application server stack in the DR Region using AWS CloudFormation drift detection. Configure cross-Region snapshots of the DB instance to the DR Region every 5 minutes. In the event of a disaster, restore the DB instance using the snapshot in the DR Region.
• C) Use Amazon EC2 Image Builder to create and copy AMIs of the web and application server to both the primary and DR Regions. Create a cross-Region read replica of the DB instance in the DR Region. In the event of a disaster, promote the read replica to become the master and reprovision the servers with AWS CloudFormation using the AMIs.
• D) Create AMIs of the web and application servers in the DR Region. Use scheduled AWS Glue jobs to synchronize the DB instance with another DB instance in the DR Region. In the event of a disaster, switch to the DB instance in the DR Region and reprovision the servers with AWS CloudFormation using the AMIs.

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Definitions:

Paired Two-sample T-test

A statistical test used to compare two population means where you have two samples in which observations in one sample can be paired with observations in the other sample.

Wilcoxon Signed Rank

The Wilcoxon Signed Rank Test is a non-parametric statistical test used to compare two related samples, matched samples, or repeated measurements on a single sample to assess differences in their population mean ranks.

Normally Distributed

Describes a statistical distribution that is symmetric around the mean, showing that data near the mean are more frequent in occurrence.

F-distribution

A probability distribution used in analysis of variance (ANOVA), depicting ratios of variances to assess the significance of group differences.