AWS Academy Cloud Operations Practice Exam

A WaitCondition in AWS CloudFormation is designed to pause the stack creation process until it receives a specific signal indicating that an operation has succeeded or failed. When you define a WaitCondition in your CloudFormation template, you can provide it with a count of expected signals and a timeout duration. This allows for a more controlled deployment, ensuring that dependent resources are only created or configured after a specified event occurs.

For instance, if you are setting up an application that requires other resources, such as an EC2 instance to complete a setup process before deploying additional components, a WaitCondition can be utilized. The EC2 instance can emit a signal via the AWS CLI or SDK once it's ready, thus informing CloudFormation to proceed. This functionality is crucial for scenarios where certain dependencies must be managed explicitly during stack operations, fostering a reliable orchestration of resources.

The other options do not accurately describe the function of a WaitCondition. Triggers for rollbacks occur under different failure conditions but are not contingent on the explicit signaling that defines a WaitCondition. Resource monitoring and log generation are important aspects of AWS services but are not the specific roles played by WaitConditions in the CloudFormation process.