The answer is the security group associated with the VPC endpoint for Bedrock does not allow inbound HTTPS traffic from the ECS tasks. This is the most likely cause because a timeout error signals a network-layer failure, specifically a dropped TCP handshake on port 443, rather than an authentication or policy denial. Since the VPC endpoint policy already permits all actions from all principals, the issue must be at the security group level, which acts as a virtual firewall for the endpoint. On the AWS Certified AI Practitioner AIF-C01 exam, this scenario tests your understanding of how VPC endpoints interact with security groups in private subnets—a common trap is assuming a permissive endpoint policy alone resolves connectivity, while forgetting that the endpoint’s security group still needs an inbound rule from the source. A helpful memory tip: “Endpoint policy says who, security group says how”—the policy controls authorization, but the security group controls the actual network path, so always check inbound HTTPS rules when troubleshooting VPC endpoint timeouts.
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. 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.
A company is deploying a generative AI model on Amazon Bedrock. The model is accessed by an application running on Amazon ECS Fargate. The security team requires that all data sent to and from the Bedrock model be encrypted in transit, and that the ECS task does not have internet access. The ECS tasks are launched in a private VPC subnet with a VPC endpoint for Bedrock configured. However, when the application attempts to invoke the Bedrock model, the call fails with a timeout error. The VPC endpoint policy is set to allow all actions from all principals. What is the most likely cause of the failure?
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 security group associated with the VPC endpoint does not allow inbound HTTPS traffic from the ECS tasks
The timeout error indicates a network connectivity issue, not an authentication or authorization problem. Since the ECS tasks are in a private subnet without internet access and a VPC endpoint for Bedrock is configured, the most likely cause is that the security group associated with the VPC endpoint does not allow inbound HTTPS (port 443) traffic from the ECS tasks. Without this inbound rule, the TCP handshake fails, resulting in a timeout.
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 ECS tasks are not configured to use a NAT gateway to reach the Bedrock endpoint
Why it's wrong here
The VPC endpoint allows private connectivity without a NATgateway.
✗
The VPC endpoint policy does not grant the ECS task IAM role permission to invoke Bedrock
Why it's wrong here
The policy allows all actions; the issue is network connectivity, not permissions.
✗
The ECS task IAM role does not have the bedrock:InvokeModel permission
Why it's wrong here
Missing permissions would result in an access denied error, not a timeout.
✓
The security group associated with the VPC endpoint does not allow inbound HTTPS traffic from the ECS tasks
Why this is correct
The security group must allow inbound HTTPS from the ECS tasks' security group; otherwise, traffic is blocked.
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 distinction between network-level failures (timeouts) and authorization failures (access denied), and the trap here is that candidates confuse VPC endpoint policy with security group rules, assuming a permissive policy is sufficient for connectivity.
Detailed technical explanation
How to think about this question
VPC endpoints for Bedrock use AWS PrivateLink, which relies on security group rules to control traffic at the endpoint's elastic network interface. The security group must have an inbound rule allowing HTTPS (TCP/443) from the source security group or CIDR of the ECS tasks. Without this rule, packets are dropped at the endpoint's ENI, causing the client to wait for a TCP SYN-ACK that never arrives, resulting in a timeout after the default OS TCP retransmission timeout (typically 3-6 seconds).
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.
Security, Compliance and Governance for AI Solutions — This question tests Security, Compliance and Governance for AI Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The security group associated with the VPC endpoint does not allow inbound HTTPS traffic from the ECS tasks — The timeout error indicates a network connectivity issue, not an authentication or authorization problem. Since the ECS tasks are in a private subnet without internet access and a VPC endpoint for Bedrock is configured, the most likely cause is that the security group associated with the VPC endpoint does not allow inbound HTTPS (port 443) traffic from the ECS tasks. Without this inbound rule, the TCP handshake fails, resulting in a timeout.
What should I do if I get this AIF-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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This AIF-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 AIF-C01 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.