AWS DevOps Engineer Professional Practice Test

In OpsWorks, what does a Layer represent?

1. A group of security settings

2. A logical set of EC2 instances serving specific purposes

3. A deployment configuration for applications

4. A billing segment for resource usage

The correct answer is: A logical set of EC2 instances serving specific purposes

In OpsWorks, a Layer is best understood as a logical organization of EC2 instances that serve specific purposes. Layers allow for the categorization of resources based on their functionality in an application stack. For instance, you might have separate layers for application servers, web servers, and database servers, each designed to perform distinct roles within an overall application architecture. This organization simplifies the management of different components and ensures that resources can be scaled independently according to the needs of each layer. By defining a layer, you can also apply specific configurations, tools, and monitoring options tailored to the responsibilities of that layer, enhancing both deployment efficiency and operational clarity. The other choices do not accurately reflect what a Layer represents in OpsWorks. Security settings pertain more to the IAM or security groups rather than the construct of a Layer. Deployment configurations are related to how applications are deployed but do not define the groups of EC2 instances. Billing segments focus on resource usage costs and do not relate to the organizational structure of application layers in OpsWorks. Thus, identifying Layers with specific EC2 functionalities is the key concept.