DEA-C01 Data Ingestion and Transformation Practice Question
A company uses AWS Lambda to process events from an S3 bucket. The Lambda function writes transformed data to another S3 bucket. Occasionally, the Lambda invocation fails with 'ResourceNotFoundException'. What is the MOST likely cause?
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 destination S3 bucket does not exist or the Lambda function's IAM role lacks permissions.
The destination bucket may not exist or the Lambda function's IAM role lacks permissions to write to it. Option A is wrong because Lambda timeouts would cause 'Timeout' error. Option C is wrong because S3 event notifications are reliable. Option D is wrong because the source bucket exists since it triggered the event.
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 timed out.
Why it's wrong here
A timeout would produce a different error (Task timed out).
- ✓
The destination S3 bucket does not exist or the Lambda function's IAM role lacks permissions.
Why this is correct
ResourceNotFoundException indicates missing resource or access denial.
- ✗
The S3 event notification is misconfigured.
Why it's wrong here
If misconfigured, the Lambda would not be triggered at all.
- ✗
The source S3 bucket has versioning disabled.
Why it's wrong here
Versioning is not required for Lambda triggers.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.