MLS-C01 Data Engineering Practice Question

Exhibit

Refer to the exhibit.

{
  "Records": [
    {
      "eventVersion": "2.1",
      "eventSource": "aws:s3",
      "awsRegion": "us-east-1",
      "eventName": "ObjectCreated:Put",
      "s3": {
        "bucket": {
          "name": "my-bucket"
        },
        "object": {
          "key": "data/sample.csv"
        }
      }
    }
  ]
}

A Lambda function is triggered by S3 events. The event payload shown in the exhibit is received by the Lambda function. The function is supposed to process the CSV file and load it into DynamoDB. However, the function fails because it cannot read the file. 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 Lambda function's IAM role does not have s3:GetObject permission

The Lambda function cannot read the file from S3 because its IAM role does not have the s3:GetObject permission. Option A is wrong because the failure is not due to DynamoDB write permissions; the function fails before writing. Option C is wrong because the S3 bucket exists, as indicated by the event triggering. Option D is wrong because the event notification is correctly configured to trigger the Lambda function, as evidenced by the function receiving 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 lacks DynamoDB write permissions
Why it's wrong here
The error is about reading the file, not writing to DynamoDB.
✓
The Lambda function's IAM role does not have s3:GetObject permission
Why this is correct
Without read permission, the function cannot access the S3 object.
✗
The S3 bucket does not exist
Why it's wrong here
The event would not have been generated if the bucket didn't exist.
✗
The S3 event notification is misconfigured
Why it's wrong here
The event notification is correctly sending the payload.

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

Practice tests

Scored 10-question sessions with instant feedback and explanations.

Free MLS-C01 Practice Test 2 — 30 Questions→MLS-C01 Practice Questions 1 — 50 Questions→MLS-C01 Practice Test 1 — 25 Questions→

Domain-focused practice

Domains are weighted differently on the real exam — spend your time where you score lowest.

Data Engineering Modeling Machine Learning Implementation and Operations Exploratory Data Analysis

Practice by question type

Filter questions by type — troubleshooting, exhibit, drag-and-drop, multi-select, and more.

Browse scenarios

Topic-level practice

Narrow in on a single topic rather than practising the whole bank at once.

Data Engineering practice questions MLS-C01 fundamentals practice questions MLS-C01 scenario practice questions

Keep going

Study guide Exam domains MLS-C01 practice test

This MLS-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 MLS-C01 exam.

MLS-C01 Data Engineering Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

Related to this question