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The simple answer is, “all of them.”

AWS is constantly evolving and adding new offerings. As of this writing, AWS has more than 90 unique services. Each one has security, data, monitoring, and availability considerations. As an AWS systems operator, you are tasked with understanding those considerations along with how to optimize the service for performance and cost. The next few chapters in this book walk you through the service categories, explain how those services are addressed from an operational perspective, and discuss what you should study.

With more than 90 services and approximately 55 questions, mathematically not every service can be addressed in the certification exam. Commonly used services might appear in many different questions, although services with more specific use cases are much less likely to appear.

For example, when studying the storage products, you must understand the options found in Amazon Simple Storage Service (Amazon S3), Amazon Elastic Block Store (Amazon EBS), and Amazon Glacier. You can expect these services to appear in questions throughout all of the domains. In contrast, AWS Snowmobile could be on the test, but because it is used only in a few specific scenarios, statistically it is unlikely to appear more than once, if at all.

The best rule of thumb is to look at common reference architectures. If you see services in those architectures, plan on them being integral to the test. However, do not discount other services; everything is fair game.

The following section provides specific reference architectures that you can use as you plan on what services to study.