AWS Certified Solutions Architect – Professional (SAP-C02) — Question 134

A company has an on-premises website application that provides real estate information for potential renters and buyers. The website uses a Java backend and a NoSQL MongoDB database to store subscriber data.

The company needs to migrate the entire application to AWS with a similar structure. The application must be deployed for high availability, and the company cannot make changes to the application.

Which solution will meet these requirements?

Answer options

• A. Use an Amazon Aurora DB cluster as the database for the subscriber data. Deploy Amazon EC2 instances in an Auto Scaling group across multiple Availability Zones for the Java backend application.
• B. Use MongoDB on Amazon EC2 instances as the database for the subscriber data. Deploy EC2 instances in an Auto Scaling group in a single Availability Zone for the Java backend application.
• C. Configure Amazon DocumentDB (with MongoDB compatibility) with appropriately sized instances in multiple Availability Zones as the database for the subscriber data. Deploy Amazon EC2 instances in an Auto Scaling group across multiple Availability Zones for the Java backend application.
• D. Configure Amazon DocumentDB (with MongoDB compatibility) in on-demand capacity mode in multiple Availability Zones as the database for the subscriber data. Deploy Amazon EC2 instances in an Auto Scaling group across multiple Availability Zones for the Java backend application.

Correct answer: C

Explanation

Option C is the correct answer because Amazon DocumentDB offers MongoDB compatibility and can be configured for high availability across multiple Availability Zones, fulfilling the requirement of not changing the application. Option A is incorrect as Amazon Aurora is not compatible with the existing MongoDB database. Option B does not provide high availability since it is restricted to a single Availability Zone. Option D, while using DocumentDB, does not specify the appropriate sizing of instances, which is essential for performance.