- A
The new model artifacts are not correctly uploaded to S3
Why wrong: Incorrect. If the new model artifacts were not correctly uploaded to S3, the new model would fail to load for all users, not just some.
- B
The endpoint is behind a load balancer that is not updated
Why wrong: Incorrect. SageMaker endpoints do not use external load balancers; the endpoint service itself manages traffic distribution.
- C
The inference container is cached and not pulling the new image
Why wrong: Incorrect. SageMaker pulls the inference container image from ECR when the model is created and does not cache it in a way that prevents updates.
- D
DNS caching on the client side is resolving to the old endpoint IP address
Correct. DNS caching at the client side can cause the endpoint's DNS name to resolve to an old IP address, particularly if the endpoint's underlying instance IPs have not changed, leading some users to still hit the old model.
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company has deployed a machine learning model on a SageMaker endpoint that serves predictions to a web application. The model uses a custom inference container that loads the model artifacts from an ECR repository. After updating the model with new training data, the data scientist creates a new model and updates the endpoint. However, some users report that they still get predictions from the old model. The data scientist confirms that the endpoint configuration points to the new model. What is the most likely cause?
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 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
DNS caching on the client side is resolving to the old endpoint IP address
DNS caching on the client side can cause the endpoint's DNS name to resolve to an old IP address, especially if the endpoint's underlying instances have not changed. This explains why some users still receive predictions from the old model even though the endpoint configuration points to the new model. Option A is incorrect because incorrect model artifacts would affect all users uniformly. Option B is incorrect because SageMaker endpoints do not have load balancers in the traditional sense; the endpoint itself routes traffic to the instances. Option C is incorrect because SageMaker automatically handles container image updates when a new model is deployed to an endpoint.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 new model artifacts are not correctly uploaded to S3
Why it's wrong here
Incorrect. If the new model artifacts were not correctly uploaded to S3, the new model would fail to load for all users, not just some.
- ✗
The endpoint is behind a load balancer that is not updated
Why it's wrong here
Incorrect. SageMaker endpoints do not use external load balancers; the endpoint service itself manages traffic distribution.
- ✗
The inference container is cached and not pulling the new image
Why it's wrong here
Incorrect. SageMaker pulls the inference container image from ECR when the model is created and does not cache it in a way that prevents updates.
- ✓
DNS caching on the client side is resolving to the old endpoint IP address
Why this is correct
Correct. DNS caching at the client side can cause the endpoint's DNS name to resolve to an old IP address, particularly if the endpoint's underlying instance IPs have not changed, leading some users to still hit the old model.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: DNS caching on the client side is resolving to the old endpoint IP address — DNS caching on the client side can cause the endpoint's DNS name to resolve to an old IP address, especially if the endpoint's underlying instances have not changed. This explains why some users still receive predictions from the old model even though the endpoint configuration points to the new model. Option A is incorrect because incorrect model artifacts would affect all users uniformly. Option B is incorrect because SageMaker endpoints do not have load balancers in the traditional sense; the endpoint itself routes traffic to the instances. Option C is incorrect because SageMaker automatically handles container image updates when a new model is deployed to an endpoint.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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