AWS Certified Cloud Practitioner — Question 280

A company is designing a web application that will run on Amazon EC2 instances.

Which AWS services and features will improve availability and reduce the impact of failures for this application? (Choose two.)

Answer options

• A. Amazon EC2 Auto Scaling for the EC2 instances
• B. VPC subnet ACLs to check the health of a service
• C. Resources that are distributed across multiple Availability Zones
• D. Configuration of AWS Server Migration Service (AWS SMS) to move the EC2 instances to a different AWS Region
• E. Resources that are distributed across multiple AWS points of presence

Correct answer: A, C

Explanation

Amazon EC2 Auto Scaling improves availability by automatically replacing unhealthy EC2 instances, while deploying resources across multiple Availability Zones ensures the application remains operational even if one zone experiences an outage. VPC subnet ACLs are security controls and cannot perform health checks, whereas AWS SMS is a migration tool rather than a high-availability solution. Points of presence are used for content delivery via CloudFront and do not host EC2 instances for application redundancy.