This MLS-C01 practice question tests your understanding of exploratory data analysis. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
A data scientist is working with a dataset that includes a 'timestamp' column. They want to create features that capture seasonality. Which feature engineering approach is most appropriate?
Bin timestamps into fixed intervals.
Why wrong: Binning loses information about periodicity.
Convert timestamp to Unix epoch seconds.
Why wrong: Linear representation does not capture cycles.
Extract hour of day and apply sine/cosine transformation.
Sine/cosine encoding preserves cyclic nature.
One-hot encode the timestamp column.
Why wrong: One-hot encoding is for categorical variables, not timestamps.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Extract hour of day and apply sine/cosine transformation.
Option D is correct because sine and cosine transformations capture cyclic patterns like time of day or day of year. Option A is wrong because one-hot encoding creates many sparse features. Option B is wrong because converting to Unix timestamp loses cyclic nature. Option C is wrong because binning loses granularity.
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.
Bin timestamps into fixed intervals.
Why it's wrong here
Binning loses information about periodicity.
Convert timestamp to Unix epoch seconds.
Why it's wrong here
Linear representation does not capture cycles.
Extract hour of day and apply sine/cosine transformation.
Why this is correct
Sine/cosine encoding preserves cyclic nature.
Related concept
Static NAT maps one inside address to one outside address.
One-hot encode the timestamp column.
Why it's wrong here
One-hot encoding is for categorical variables, not timestamps.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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
Exploratory Data Analysis — This question tests Exploratory Data Analysis — Static NAT maps one inside address to one outside address..
The correct answer is: Extract hour of day and apply sine/cosine transformation. — Option D is correct because sine and cosine transformations capture cyclic patterns like time of day or day of year. Option A is wrong because one-hot encoding creates many sparse features. Option B is wrong because converting to Unix timestamp loses cyclic nature. Option C is wrong because binning loses granularity.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
This MLS-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 MLS-C01 exam.
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