AWS Certified Solutions Architect – Associate (SAA-C03) — Question 822
An ecommerce company is migrating its on-premises workload to the AWS Cloud. The workload currently consists of a web application and a backend Microsoft SQL database for storage.
The company expects a high volume of customers during a promotional event. The new infrastructure in the AWS Cloud must be highly available and scalable.
Which solution will meet these requirements with the LEAST administrative overhead?
Answer options
- A. Migrate the web application to two Amazon EC2 instances across two Availability Zones behind an Application Load Balancer. Migrate the database to Amazon RDS for Microsoft SQL Server with read replicas in both Availability Zones.
- B. Migrate the web application to an Amazon EC2 instance that runs in an Auto Scaling group across two Availability Zones behind an Application Load Balancer. Migrate the database to two EC2 instances across separate AWS Regions with database replication.
- C. Migrate the web application to Amazon EC2 instances that run in an Auto Scaling group across two Availability Zones behind an Application Load Balancer. Migrate the database to Amazon RDS with Multi-AZ deployment.
- D. Migrate the web application to three Amazon EC2 instances across three Availability Zones behind an Application Load Balancer. Migrate the database to three EC2 instances across three Availability Zones.
Correct answer: C
Explanation
Option C is the correct solution because an Auto Scaling group automatically scales the Amazon EC2 instances to handle high volumes of traffic, while Amazon RDS with a Multi-AZ deployment ensures high availability and automatic failover for the database with minimal administrative overhead. Options A and D fail to provide the necessary automatic scaling for the web tier to handle fluctuating traffic. Managing databases directly on EC2 instances as suggested in options B and D significantly increases administrative overhead compared to utilizing the fully managed Amazon RDS service.