Those questions were carefully designed to test not only your overall understanding of some of the AWSBig Data services and concepts, but also the ability to practically apply your knowledge in your potential everyday encounters and interaction with the services. You are absolutely required to already have experience with AWS, as well as a notion of general data collection, storage, analysis and security. Keep in mind that every single question is crucial not only for passing the certification exam, but also delivering a high quality service in your work with big data.