The answer is that the endpoint lacks a VPC configuration with proper security groups. This is correct because SageMaker endpoints deployed without a VPC use the default SageMaker network, which cannot route traffic to databases in private subnets; the error you see is a direct symptom of that missing connectivity. On the AWS Certified Machine Learning Engineer Associate MLA-C01 exam, this scenario tests your understanding of how SageMaker networking integrates with VPCs—specifically that inference endpoints must be attached to a VPC with security groups allowing outbound traffic to the database, and that network ACLs must also permit the return traffic. A common trap is assuming the database itself is misconfigured, when the real issue is the endpoint’s network isolation. Remember the mnemonic: “No VPC, no DB reach—attach the endpoint to the right subnet and SG.”
MLA-C01 Deployment and Orchestration of ML Workflows Practice Question
This MLA-C01 practice question tests your understanding of deployment and orchestration of ml workflows. 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 SageMaker endpoint is logging this error when processing inference requests that require database access. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The endpoint lacks a VPC configuration with proper security groups
The error indicates that the SageMaker endpoint cannot connect to the database when processing inference requests. This is most likely because the endpoint is not configured with a VPC that includes proper security groups and network ACLs to allow outbound traffic to the database. Without a VPC configuration, the endpoint uses the default SageMaker network, which lacks the necessary routing and security rules to reach resources in a private subnet.
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.
✗
Data capture is not enabled
Why it's wrong here
Data capture logs requests but does not affect network connectivity.
✗
The endpoint instance type is too small
Why it's wrong here
Instance size would not cause a connection timeout to an external URL.
✗
The model is not compatible with the instance
Why it's wrong here
Model compatibility would cause different errors, not network timeout.
✓
The endpoint lacks a VPC configuration with proper security groups
Why this is correct
Without VPC configuration, the endpoint cannot reach resources inside a VPC.
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
AWS often tests the misconception that network connectivity errors are caused by instance size or model compatibility, when the actual issue is a missing or misconfigured VPC configuration for the SageMaker endpoint.
Detailed technical explanation
How to think about this question
SageMaker endpoints by default run in a managed AWS network without VPC attachment. To access resources in a VPC (e.g., an RDS database), the endpoint must be configured with a VPC subnet and security group that allows outbound traffic (e.g., port 3306 for MySQL or 5432 for PostgreSQL). Additionally, the database's security group must allow inbound traffic from the endpoint's security group. This is a common misconfiguration when deploying models that rely on external data stores.
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.
TExam Day Tips
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment and Orchestration of ML Workflows — This question tests Deployment and Orchestration of ML Workflows — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The endpoint lacks a VPC configuration with proper security groups — The error indicates that the SageMaker endpoint cannot connect to the database when processing inference requests. This is most likely because the endpoint is not configured with a VPC that includes proper security groups and network ACLs to allow outbound traffic to the database. Without a VPC configuration, the endpoint uses the default SageMaker network, which lacks the necessary routing and security rules to reach resources in a private subnet.
What should I do if I get this MLA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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Question Discussion
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