This MLS-C01 practice question tests your understanding of data engineering. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company uses Amazon Kinesis Data Firehose to deliver data to Amazon S3. The data must be transformed before delivery using AWS Lambda. The Lambda function adds a timestamp field. The Firehose stream receives up to 10,000 records per second. The transformation currently takes 500 ms per record. What should the team do to ensure the transformation can keep up with the incoming data without data loss?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the Lambda concurrency limit for the function to handle parallel invocations.
Option B is correct because increasing the Lambda concurrency limit ensures that multiple Lambda invocations can run in parallel to handle the high throughput. Option A is wrong because increasing the buffer size would cause delays and potential data loss if the buffer fills up. Option C is wrong because increasing the number of shards applies to Kinesis Data Streams, not Firehose. Option D is wrong because Lambda functions in a VPC may have reduced network performance and are not needed for adding a timestamp.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the number of shards in the Kinesis stream.
Why it's wrong here
Firehose does not use shards; it is a managed service.
✗
Place the Lambda function in a VPC to improve network performance.
Why it's wrong here
VPC placement adds network overhead and is not beneficial for simple transformations.
✓
Increase the Lambda concurrency limit for the function to handle parallel invocations.
Why this is correct
More concurrency allows processing more records in parallel.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the S3 buffer size and buffer interval in the Firehose delivery stream.
Why it's wrong here
Larger buffer may cause the Lambda to be invoked less frequently but with more data, increasing the chance of timeout.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the Lambda concurrency limit for the function to handle parallel invocations. — Option B is correct because increasing the Lambda concurrency limit ensures that multiple Lambda invocations can run in parallel to handle the high throughput. Option A is wrong because increasing the buffer size would cause delays and potential data loss if the buffer fills up. Option C is wrong because increasing the number of shards applies to Kinesis Data Streams, not Firehose. Option D is wrong because Lambda functions in a VPC may have reduced network performance and are not needed for adding a timestamp.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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