The answer is that the Lambda function’s timeout setting is too short, as the 15-second timeout cap is the immediate cause of the failure. AWS Lambda has a default timeout of 3 seconds, but you can configure it up to 15 minutes; when troubleshooting Lambda timeout during data ingestion from APIs, a timeout at exactly 15 seconds indicates the function’s maximum execution duration was set to that limit, not that the API or payload size is the problem. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of Lambda execution environment limits versus other constraints like memory or VPC latency—a common trap is to blame the 10 MB JSON payload, but Lambda supports up to 6 MB for synchronous invocation payloads and 256 KB for asynchronous, so 10 MB is fine for S3 writes. Remember the memory tip: “Timeout first, memory second”—always check the configured timeout value before adjusting memory or networking when you see a consistent cut-off at a specific second.
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is ingesting data from a third-party API into Amazon S3 using AWS Lambda. The API returns a JSON payload of up to 10 MB per request. The Lambda function runs every minute. Occasionally, the function times out after 15 seconds. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Lambda function's timeout setting is too short.
Option B is correct because Lambda has a default timeout of 3 seconds, but can be increased to 15 minutes. If the function times out at 15 seconds, the timeout is set to 15 seconds. Increasing it resolves the issue. Option A is wrong because 10 MB is within Lambda limits. Option C is wrong because memory may need increase but timeout is the immediate cause. Option D is wrong because VPC configuration can cause delays but not specifically timeout.
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.
✗
The Lambda function is in a VPC without a NAT gateway, causing network timeouts.
Why it's wrong here
Network issues would cause different errors.
✓
The Lambda function's timeout setting is too short.
Why this is correct
Default timeout is 3 seconds; increase to handle larger payloads.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The Lambda function's memory is too low, causing slow processing.
Why it's wrong here
Memory may contribute but timeout is the primary issue.
✗
The API response size exceeds the Lambda invocation payload limit.
Why it's wrong here
Lambda supports up to 6 MB for synchronous invocation, but API response is handled differently.
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: The Lambda function's timeout setting is too short. — Option B is correct because Lambda has a default timeout of 3 seconds, but can be increased to 15 minutes. If the function times out at 15 seconds, the timeout is set to 15 seconds. Increasing it resolves the issue. Option A is wrong because 10 MB is within Lambda limits. Option C is wrong because memory may need increase but timeout is the immediate cause. Option D is wrong because VPC configuration can cause delays but not specifically timeout.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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