The answer is that the command does not paginate through all objects, as the AWS CLI list-objects pagination only returns up to 1000 objects per single call by default. When a data engineer runs list-objects against an S3 bucket prefix containing many log files, the command stops after the first 1000 entries, so if the large files are beyond that limit, they never appear in the output—even though they exist and match the size filter. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this tests your understanding of S3 API limitations and how they affect data retrieval workflows, often appearing as a trap where candidates assume the query syntax or prefix is wrong. A common memory tip: think of S3 list-objects as a book with only 1000 pages per chapter—you must use the --page-size or --max-items parameters to turn the page and see the rest.
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 AWS CLI command shown in the exhibit to find large log files in S3. The command returns an empty list, but the engineer knows there are files larger than 1 MB in that prefix. What is the MOST likely issue?
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 command does not paginate through all objects; only the first 1000 are returned
Option A is correct. The list-objects command returns up to 1000 objects per call. If there are more objects, pagination is needed. Option B is incorrect because the query syntax is correct. Option C is incorrect because the prefix is fine. Option D is incorrect because the unit is bytes, so 1000000 is 1 MB.
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 JMESPath query syntax is incorrect
Why it's wrong here
The query syntax is valid.
✓
The command does not paginate through all objects; only the first 1000 are returned
Why this is correct
list-objects limits to 1000 keys; use --max-items or pagination.
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 prefix is incorrect; there are no objects under that prefix
Why it's wrong here
The engineer knows there are objects.
✗
The Size value is in kilobytes, not bytes
Why it's wrong here
Size is in bytes; 1000000 is correct for 1 MB.
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.
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 MLS-C01 NAT questions on configuration and troubleshooting.
Data Engineering — This question tests Data Engineering — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The command does not paginate through all objects; only the first 1000 are returned — Option A is correct. The list-objects command returns up to 1000 objects per call. If there are more objects, pagination is needed. Option B is incorrect because the query syntax is correct. Option C is incorrect because the prefix is fine. Option D is incorrect because the unit is bytes, so 1000000 is 1 MB.
What should I do if I get this MLS-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 MLS-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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Question Discussion
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