- A
Amazon SQS queue to store S3 events and a cron job to poll and start training
Why wrong: Cron jobs are not event-driven and introduce latency.
- B
Use SageMaker Pipelines with a schedule to check for new data every hour
Why wrong: Scheduled checks are less efficient than event-driven triggers.
- C
Amazon S3 event notification to directly start a SageMaker training job
Why wrong: S3 cannot directly start a SageMaker job; it needs a Lambda intermediary.
- D
Amazon CloudWatch Events to run an AWS Step Functions state machine that starts a SageMaker training job
Why wrong: Step Functions adds complexity; direct Lambda is simpler.
- E
Amazon CloudWatch Events to invoke an AWS Lambda function that starts a SageMaker training job
CloudWatch Events can capture S3 events and invoke Lambda to start training.
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. 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.
A data scientist is deploying a machine learning model using SageMaker and wants to automate the retraining pipeline. The training data is updated daily in an S3 bucket. Which combination of AWS services should the data scientist use to trigger a new training job when new data arrives?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon CloudWatch Events to invoke an AWS Lambda function that starts a SageMaker training job
Option C is correct because S3 Events can trigger a Lambda function, which starts a SageMaker training job. Option A uses CloudWatch Events but is more complex for simple triggers. Option B misses the Lambda function. Option D uses Step Functions unnecessarily. Option E uses SageMaker Pipelines, which can be triggered by events but requires additional setup.
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.
- ✗
Amazon SQS queue to store S3 events and a cron job to poll and start training
Why it's wrong here
Cron jobs are not event-driven and introduce latency.
- ✗
Use SageMaker Pipelines with a schedule to check for new data every hour
Why it's wrong here
Scheduled checks are less efficient than event-driven triggers.
- ✗
Amazon S3 event notification to directly start a SageMaker training job
Why it's wrong here
S3 cannot directly start a SageMaker job; it needs a Lambda intermediary.
- ✗
Amazon CloudWatch Events to run an AWS Step Functions state machine that starts a SageMaker training job
Why it's wrong here
Step Functions adds complexity; direct Lambda is simpler.
- ✓
Amazon CloudWatch Events to invoke an AWS Lambda function that starts a SageMaker training job
Why this is correct
CloudWatch Events can capture S3 events and invoke Lambda to start training.
Related concept
Static NAT maps one inside address to one outside address.
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.
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Machine Learning Implementation and Operations — study guide chapter
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Amazon CloudWatch Events to invoke an AWS Lambda function that starts a SageMaker training job — Option C is correct because S3 Events can trigger a Lambda function, which starts a SageMaker training job. Option A uses CloudWatch Events but is more complex for simple triggers. Option B misses the Lambda function. Option D uses Step Functions unnecessarily. Option E uses SageMaker Pipelines, which can be triggered by events but requires additional setup.
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.
What is the key concept behind this question?
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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