The answer is a type mismatch caused by comparing the integer 'Size' field to the string '1000' in the AWS CLI query filter. The 'Size' property in S3 is stored as a numeric integer, but the query uses quotation marks around the value, turning it into a string literal; this mismatch means the filter condition 'Size > "1000"' never evaluates to true, returning an empty result even when matching objects exist. On the AWS Certified Data Engineer Associate DEA-C01 exam, this tests your understanding of how JMESPath query filters handle data types in the AWS CLI, a common trap where candidates forget that numeric fields must be compared without quotes. Remember the search intent keyword "AWS CLI query filter type mismatch" — the CLI does not perform implicit type conversion, so a string compared to an integer always fails. Memory tip: "No quotes for numbers" — if the field is a number in the JSON output, keep the comparison value bare, like 'Size > `1000`'.
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
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.
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.
The 'Size' field in S3 is an integer, but the query compares it to a string '1000'. This causes a type mismatch, and the filter evaluates to false. Option A is wrong because the prefix is correct. Option B is wrong because the output format does not affect the query. Option D is wrong because there is no need for pagination (the command returns up to 1000 objects).
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
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
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Static NAT maps one inside address to one outside address..
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. — The 'Size' field in S3 is an integer, but the query compares it to a string '1000'. This causes a type mismatch, and the filter evaluates to false. Option A is wrong because the prefix is correct. Option B is wrong because the output format does not affect the query. Option D is wrong because there is no need for pagination (the command returns up to 1000 objects).
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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