SAP-C02 Question #173: Real Exam Question with Answer & Explanation

Question

A large company has a business-critical application that runs in a single AWS Region. The application consists of multiple Amazon EC2 instances and an Amazon RDS Multi-AZ DB instance. The EC2 instances run in an Amazon EC2 Auto Scaling group across multiple Availability Zones. A solutions architect is implementing a disaster recovery (DR) plan for the application. The solutions architect has created a pilot light application deployment in a new Region, which is referred to as the DR Region. The DR environment has an Auto Scaling group with a single EC2 instance and a read replica of the RDS DB instance. The solutions architect must automate a failover from the primary application environment to the pilot light environment in the DR Region. Which solution meets these requirements with the MOST operational efficiency?

Options

• APublish an application availability metric to Amazon CloudWatch in the DR Region from the
• BCreate a cron task that runs every 5 minutes by using one of the application's EC2 instances in
• CCreate a cron task that runs every 5 minutes by using one of the application's EC2 instances in
• DPublish an application availability metric to Amazon CloudWatch in the DR Region from the

Explanation

To automate failover for a pilot light DR environment, application availability in the primary region should trigger actions in the DR region.

Common mistakes.

• A. This option is identical to D, indicating a potential issue with the question's choices, but D is designated as the correct answer in this context.
• B. Creating a cron task on an application EC2 instance in the primary region for monitoring and failover is not a robust or highly available solution, as the monitoring instance itself could fail.
• C. Similar to B, a cron task on a single EC2 instance is an unreliable mechanism for automating business-critical DR failover because the instance could become unavailable.

Concept tested. Automated disaster recovery failover using CloudWatch alarms

Reference. https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/UsingAlarmActions.html

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