DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. 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.
Network Topology
The command returns an empty result, but you know there are objects in the 'logs/' prefix larger than 1000 bytes. What is the MOST likely reason?
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.
Network Topology
A
The prefix 'logs/' is incorrect; the objects are in a different prefix.
Why wrong: If the prefix were wrong, the command would return no keys at all, but the query is filtering.
B
The comparison 'Size > '1000'' uses a string instead of a number, so it never matches.
Size is a numeric field; comparing to a string causes the filter to be false.
C
The command does not paginate, so it only checks the first 1000 objects.
Why wrong: Although pagination is an issue for large buckets, the command would still return some results if they existed in the first page.
D
The output format is set to text, but the query requires JSON.
Why wrong: The --query works with any output format; it processes the JSON response internally.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The comparison 'Size > '1000'' uses a string instead of a number, so it never matches.
Option B is correct because the `Size > '1000'` comparison treats `'1000'` as a string literal rather than a numeric value. In AWS CLI commands like `list-objects-v2` combined with JMESPath queries, numeric comparisons require unquoted numbers; a quoted string will never match a numeric field, resulting in an empty result even when objects larger than 1000 bytes exist.
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 prefix 'logs/' is incorrect; the objects are in a different prefix.
Why it's wrong here
If the prefix were wrong, the command would return no keys at all, but the query is filtering.
✓
The comparison 'Size > '1000'' uses a string instead of a number, so it never matches.
Why this is correct
Size is a numeric field; comparing to a string causes the filter to be false.
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 command does not paginate, so it only checks the first 1000 objects.
Why it's wrong here
Although pagination is an issue for large buckets, the command would still return some results if they existed in the first page.
✗
The output format is set to text, but the query requires JSON.
Why it's wrong here
The --query works with any output format; it processes the JSON response internally.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The DEA-C01 exam often tests the subtle distinction between string and numeric comparisons in JMESPath queries, where candidates mistakenly assume that quoted numbers are automatically coerced to integers.
Trap categories for this question
Command / output trap
If the prefix were wrong, the command would return no keys at all, but the query is filtering.
Detailed technical explanation
How to think about this question
JMESPath comparisons are type-sensitive: `Size > '1000'` compares the integer `Size` field against the string `'1000'`, which in JMESPath always evaluates to `false` because the types differ. The correct syntax is `Size > 1000` (unquoted). This is a common pitfall when using the `--query` parameter in AWS CLI commands, as JMESPath does not perform implicit type coercion for comparison operators.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 comparison 'Size > '1000'' uses a string instead of a number, so it never matches. — Option B is correct because the `Size > '1000'` comparison treats `'1000'` as a string literal rather than a numeric value. In AWS CLI commands like `list-objects-v2` combined with JMESPath queries, numeric comparisons require unquoted numbers; a quoted string will never match a numeric field, resulting in an empty result even when objects larger than 1000 bytes exist.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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Question Discussion
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