AWS Data Engineer - Associate (DEA-C01) — Practice Questions and Mock Exam

The AWS Certified Data Engineer – Associate validates the ability to design and implement data pipelines, manage data stores, and ensure data quality and governance on AWS. It covers data ingestion and transformation using services like Glue and Kinesis, data store management with Redshift and S3, operational support, and data security best practices.

This certification is designed for data engineers with the equivalent of two to three years of experience in data engineering and at least one to two years of hands-on experience with AWS services. It demonstrates proficiency in designing cost-effective, scalable data architectures using AWS-native services.

Data Ingestion and Transformation carries the most weight at 34%, covering how source data gets pulled in (streaming or batch), reshaped into a usable format, and pushed through an orchestrated workflow, plus the coding discipline and automation habits behind a maintainable pipeline. Data Store Management follows at 26%, testing whether a candidate can match a workload to the right storage service among AWS's relational, NoSQL, and lake-house options, keep that data discoverable through cataloging, retire it on a defined schedule, and adjust its schema as requirements shift.

Data Operations and Support takes 22%, automating pipelines with Glue and Lambda, analyzing data through Athena and QuickSight, and troubleshooting failures once they're in production. Data Security and Governance closes the blueprint at 18%, and it's where IAM, Lake Formation permissions, encryption, and PII handling live — a domain candidates who focus purely on pipeline mechanics tend to shortchange.

The exam draws 65 questions (50 scored, 15 unscored) from multiple-choice and multiple-response formats inside a 130-minute window. Most items are scenario-based, describing a pipeline requirement or data architecture problem and asking which combination of Glue, Kinesis, Redshift, Athena, or Lake Formation resolves it. At roughly 2 minutes per question, the pace rewards recognizing the right service family quickly rather than working through every option.

Every domain of the DEA-C01 exam has enough questions in the pool to practice it in depth. A mock exam asks 65 questions in one sitting, on the same 130-minute clock as the real thing.

How long you'll need depends on how much hands-on experience you bring. The rest is set by the vendor: how the exam is delivered, how soon you can retake it, and how long the credential stays valid.

The exam runs through Pearson VUE, either at a testing center or online with a remote proctor, and is offered in English, Japanese, Korean, and Simplified Chinese. Certification holds for 3 years; renewal means passing a recertification exam before it expires, or earning a higher-level AWS certification, which renews it automatically.

Knowing when AWS Glue's serverless ETL beats Amazon EMR's managed Spark clusters, and the reverse, is a recurring judgment call the exam expects rather than a fact to memorize, and the same applies to choosing between Kinesis Data Streams, Kinesis Firehose, and batch-based Glue jobs for a given ingestion pattern. Lake Formation's role in fine-grained access control and how it integrates with Glue and Athena catches candidates who've only worked with S3 bucket policies, and picking the wrong S3 storage class or Redshift node type for a stated access pattern is an easy way to lose points on cost-focused questions.