The answer is that the retention period is set to 24 hours, causing data older than 24 hours to be automatically deleted. Kinesis Data Streams uses a retention period to define how long records are stored in a shard; once that time elapses, the data is permanently removed and cannot be read by any consumer, regardless of the shard iterator type used. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding of stream lifecycle management and the default 24-hour retention limit, which can be extended up to 365 days. A common trap is assuming consumers can always replay historical data, but the retention period is the hard boundary—if it’s set to 24 hours, any attempt to read data beyond that window will fail. Memory tip: think of the retention period as a “data expiration timer”—once it runs out, the data is gone for good.
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Network Topology
A data engineer runs the command shown. The consumer application is unable to read data older than 24 hours. 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 retention period is set to 24 hours, so data older than 24 hours is deleted.
The stream's retention period is 24 hours, meaning data is automatically deleted after 24 hours. The consumer tries to read data older than 24 hours, which is no longer available.
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.
✗
The shard has reached its maximum sequence number.
Why it's wrong here
A shard can have a very large sequence number; this is not a limit.
✗
The stream is encrypted with KMS, preventing access.
Why it's wrong here
KMS encryption does not block reading data within the retention period.
✓
The retention period is set to 24 hours, so data older than 24 hours is deleted.
Why this is correct
Data retention is 24 hours; data beyond that is expired.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The stream is in ACTIVE status but not processing data.
Why it's wrong here
ACTIVE means the stream is working normally.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which DEA-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 Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The retention period is set to 24 hours, so data older than 24 hours is deleted. — The stream's retention period is 24 hours, meaning data is automatically deleted after 24 hours. The consumer tries to read data older than 24 hours, which is no longer available.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-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.
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?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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