Quick Answer
The answer is Amazon DynamoDB, the most appropriate AWS database service for storing JSON documents that require ACID transactions. DynamoDB natively supports JSON document storage and provides DynamoDB Transactions, which enable atomic, consistent, isolated, and durable operations across one or more items within a single table or across multiple tables. This directly addresses the need for frequently updated JSON documents while maintaining transactional integrity. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish between purpose-built databases: a common trap is confusing DocumentDB’s MongoDB compatibility with full ACID support, but DynamoDB’s transactions are fully ACID-compliant, whereas DocumentDB’s are limited. Another trap is selecting S3, which is object storage, not a database, or Neptune, a graph database unsuited for JSON. A helpful memory tip: think “DynamoDB = Documents + ACID,” and remember that the “D” in DynamoDB stands for “Documents with Transactions.”
This DEA-C01 practice question tests your understanding of data store management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data engineer needs to store JSON documents that are frequently updated and require ACID transactions. Which AWS database service is most appropriate?
Amazon Neptune
Why wrong: Neptune is a graph database, not suitable for JSON document storage.
Amazon DocumentDB
Why wrong: DocumentDB is for MongoDB workloads, ACID transactions are not fully supported.
Amazon DynamoDB
DynamoDB supports JSON and ACID transactions.
Amazon S3
Why wrong: S3 is object storage, not a database; no ACID transactions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon DynamoDB
Option A is correct because Amazon DynamoDB supports JSON documents and ACID transactions via DynamoDB Transactions. Option B is wrong because Amazon S3 is not a database and does not support transactions. Option C is wrong because Amazon DocumentDB is a MongoDB-compatible database but ACID transactions are limited. Option D is wrong because Amazon Neptune is a graph database, not optimized for JSON documents.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Amazon Neptune
Why it's wrong here
Neptune is a graph database, not suitable for JSON document storage.
Amazon DocumentDB
Why it's wrong here
DocumentDB is for MongoDB workloads, ACID transactions are not fully supported.
Amazon DynamoDB
Amazon S3
Why it's wrong here
S3 is object storage, not a database; no ACID transactions.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Store Management — study guide chapter
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FAQ
Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..
The correct answer is: Amazon DynamoDB — Option A is correct because Amazon DynamoDB supports JSON documents and ACID transactions via DynamoDB Transactions. Option B is wrong because Amazon S3 is not a database and does not support transactions. Option C is wrong because Amazon DocumentDB is a MongoDB-compatible database but ACID transactions are limited. Option D is wrong because Amazon Neptune is a graph database, not optimized for JSON documents.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.
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