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Data Ingestion and Transformation →hardMultiple ChoiceObjective-mapped

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.

A
The Lambda function is in a VPC without a NAT gateway, causing network timeouts.
Why wrong: Network issues would cause different errors.
B
The Lambda function's timeout setting is too short.
Default timeout is 3 seconds; increase to handle larger payloads.
C
The Lambda function's memory is too low, causing slow processing.
Why wrong: Memory may contribute but timeout is the primary issue.
D
The API response size exceeds the Lambda invocation payload limit.
Why wrong: Lambda supports up to 6 MB for synchronous invocation, but API response is handled differently.

Full breakdown with real-world context →

Answer choices

Why each option matters

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 the Lambda function times out after 15 seconds, which matches its configured timeout. Increasing the timeout value (up to 15 minutes) would resolve the occasional timeout. Option A is incorrect: being in a VPC without a NAT gateway would cause consistent failures due to lack of internet access, not occasional timeouts. Option C is incorrect: while insufficient memory can slow processing, the immediate symptom of timing out exactly at 15 seconds points to the timeout setting, not memory. Option D is incorrect: the API response size (up to 10 MB) does not affect Lambda's invocation payload limit, which applies to the event that triggers the function (a small CloudWatch Event), not the HTTP response received by the function.

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.

Visual reference

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

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.

Related DEA-C01 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

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 the Lambda function times out after 15 seconds, which matches its configured timeout. Increasing the timeout value (up to 15 minutes) would resolve the occasional timeout. Option A is incorrect: being in a VPC without a NAT gateway would cause consistent failures due to lack of internet access, not occasional timeouts. Option C is incorrect: while insufficient memory can slow processing, the immediate symptom of timing out exactly at 15 seconds points to the timeout setting, not memory. Option D is incorrect: the API response size (up to 10 MB) does not affect Lambda's invocation payload limit, which applies to the event that triggers the function (a small CloudWatch Event), not the HTTP response received by the function.

What should I do if I get this DEA-C01 question wrong?

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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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.