The most likely cause is that the EC2 instance is not using the specified VPC endpoint (vpce-12345678). This IAM policy condition explicitly restricts SageMaker invocation requests to those originating from a particular VPC endpoint, meaning the source VPCe ID must match the condition value. If the EC2 instance routes traffic through a different VPC endpoint or uses direct VPC-to-SageMaker connectivity without a VPC endpoint, the condition fails and the request is denied. On the AWS Certified AI Practitioner AIF-C01 exam, this scenario tests your understanding of how IAM policy VPC endpoint conditions enforce network-level access control for SageMaker invocations, a common trap where candidates overlook that the condition applies to the endpoint identity, not just the VPC. Remember the mnemonic "VPCe Match" — the endpoint ID in the policy must exactly match the endpoint the resource is using, or access is blocked.
AIF-C01 Practice Question: Security, Compliance and Governance for AI Solutions
This AIF-C01 practice question tests your understanding of security, compliance and governance for ai solutions. 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.
Refer to the exhibit. A security officer has attached this IAM policy to a user to allow invocation of a SageMaker endpoint. However, the user is unable to invoke the endpoint from an EC2 instance in the same VPC. 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 EC2 instance is not using the specified VPC endpoint (vpce-12345678).
The policy condition requires that the request originates from a specific VPC endpoint (vpce-12345678). If the EC2 instance is not using that endpoint (e.g., it is using a different endpoint or direct VPC access), the request will be denied. Option B is correct because the instance likely does not use that specific VPC endpoint.
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.
✗
The SageMaker endpoint is not configured to accept traffic from the VPC.
Why it's wrong here
The endpoint may be configured for VPC access, but the policy condition is the issue.
✗
The IAM policy does not allow the sagemaker:InvokeEndpoint action without conditions.
Why it's wrong here
The policy allows the action; the condition is the cause.
✗
The user's IAM role is missing the s3:GetObject permission for model artifacts.
Why it's wrong here
The policy shown is for invoking the endpoint, not for accessing artifacts.
✓
The EC2 instance is not using the specified VPC endpoint (vpce-12345678).
Why this is correct
The condition restricts invocation to traffic coming through that specific VPC endpoint.
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.
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.
Trap categories for this question
Command / output trap
The policy shown is for invoking the endpoint, not for accessing artifacts.
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 AIF-C01 NAT questions on configuration and troubleshooting.
Security, Compliance and Governance for AI Solutions — This question tests Security, Compliance and Governance for AI Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The EC2 instance is not using the specified VPC endpoint (vpce-12345678). — The policy condition requires that the request originates from a specific VPC endpoint (vpce-12345678). If the EC2 instance is not using that endpoint (e.g., it is using a different endpoint or direct VPC access), the request will be denied. Option B is correct because the instance likely does not use that specific VPC endpoint.
What should I do if I get this AIF-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 AIF-C01 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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