The correct combination is Amazon API Gateway, Amazon Kinesis Data Streams, and Kinesis Data Firehose because this architecture directly addresses the need for ingesting HTTP POST streaming data while supporting both real-time analytics and durable storage. API Gateway acts as the front door, receiving JSON messages from thousands of devices and routing them into Kinesis Data Streams, which provides a low-latency, ordered stream for real-time consumption by analytics applications. Kinesis Data Firehose then automatically delivers that streaming data to Amazon S3 with minimal latency, eliminating the need for custom code. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of the separation between real-time ingestion (Data Streams) and batch delivery (Firehose), with a common trap being to choose SQS or Lambda alone—SQS lacks real-time streaming semantics, and Lambda alone cannot buffer to S3 efficiently. Remember the memory tip: “API catches the POST, Streams keep it hot, Firehose drops it in the bucket.”
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 ingest streaming data from thousands of devices sending JSON messages via HTTP POST. The data should be stored in Amazon S3 with minimal latency and also be available for real-time analytics. Which combination of services is MOST appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon API Gateway, Amazon Kinesis Data Streams, and Kinesis Data Firehose.
Option C is correct because API Gateway ingests HTTP POST, sends to Kinesis Data Streams for real-time consumption, and Firehose delivers to S3. Option A (SQS) is not ideal for real-time streaming. Option B (DynamoDB Streams) is for database changes. Option D (Lambda + S3) lacks real-time analytics capability.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Amazon DynamoDB with DynamoDB Streams and Lambda.
Why it's wrong here
DynamoDB is a database, not a streaming ingestion service for HTTP POST.
✗
Amazon SQS and AWS Lambda to write to S3.
Why it's wrong here
SQS is for decoupling, not real-time streaming analytics.
✗
AWS Lambda directly writing to S3 via API Gateway.
Why it's wrong here
Lambda may have concurrency limits and does not provide real-time analytics capabilities.
✓
Amazon API Gateway, Amazon Kinesis Data Streams, and Kinesis Data Firehose.
Why this is correct
API Gateway receives POST, sends to Kinesis for real-time analytics, and Firehose batches to S3.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
How this comes up in practice
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
Got this wrong? Here's your next step.
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 Ingestion and Transformation — This question tests Data Ingestion and Transformation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Amazon API Gateway, Amazon Kinesis Data Streams, and Kinesis Data Firehose. — Option C is correct because API Gateway ingests HTTP POST, sends to Kinesis Data Streams for real-time consumption, and Firehose delivers to S3. Option A (SQS) is not ideal for real-time streaming. Option B (DynamoDB Streams) is for database changes. Option D (Lambda + S3) lacks real-time analytics capability.
What should I do if I get this DEA-C01 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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