This MLS-C01 practice question tests your understanding of modeling. 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.
Refer to the exhibit. A custom training job using Pipe input mode fails. The logs indicate the algorithm cannot read the data. 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.
The algorithm expects File mode but Pipe mode is specified
Pipe mode sends data via pipe; algorithms expecting files will fail.
The instance type is too small for the data
Why wrong: No indication of resource exhaustion.
The training data is compressed
Why wrong: CompressionType is None.
The training image is not accessible
Why wrong: The image URI is valid and the job started.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The algorithm expects File mode but Pipe mode is specified
Pipe mode streams data from S3, but the algorithm must be designed to read from a pipe (stdin) rather than a file. Many custom algorithms expect files. Option A is wrong because the image path is correct. Option B is wrong because instance type is not the cause. Option C is wrong because compression is none.
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
For each option: why learners choose it and why it is or isn't the right answer here.
The algorithm expects File mode but Pipe mode is specified
Why this is correct
Pipe mode sends data via pipe; algorithms expecting files will fail.
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 instance type is too small for the data
Why it's wrong here
No indication of resource exhaustion.
The training data is compressed
Why it's wrong here
CompressionType is None.
The training image is not accessible
Why it's wrong here
The image URI is valid and the job started.
Common exam traps
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
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.
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
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
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.
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FAQ
Modeling — This question tests Modeling — Static NAT maps one inside address to one outside address..
The correct answer is: The algorithm expects File mode but Pipe mode is specified — Pipe mode streams data from S3, but the algorithm must be designed to read from a pipe (stdin) rather than a file. Many custom algorithms expect files. Option A is wrong because the image path is correct. Option B is wrong because instance type is not the cause. Option C is wrong because compression is none.
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.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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