The correct IAM policy ARN for Amazon Bedrock foundation models must use "foundation-model" in the resource path, not just "model". This is because Bedrock distinguishes between different resource types in its ARN structure, and foundation models are specifically categorized under the "foundation-model" segment to ensure precise access control. When you write "model" instead, the policy fails to match any valid Bedrock resource, causing invocation to fail even if the rest of the policy is correct. On the AWS Certified AI Practitioner AIF-C01 exam, this is a common trap where candidates overlook the exact ARN syntax required for Bedrock, often confusing it with other AWS services that use a simpler "model" path. The correct format is arn:aws:bedrock:region::foundation-model/model-id. To remember this, think of Bedrock as requiring the full "foundation" label because these are the base models you build upon—so always include the full "foundation-model" in your ARN.
AIF-C01 Applications of Foundation Models Practice Question
This AIF-C01 practice question tests your understanding of applications of foundation models. 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.
Exhibit
Refer to the exhibit.
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "bedrock:InvokeModel",
"Resource": "arn:aws:bedrock:us-east-1:123456789012:model/amazon.titan-text-express-v1"
}
]
}
A security engineer creates the above IAM policy to allow a user to invoke an Amazon Bedrock model. However, invocation fails. What is the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ARN should use "foundation-model" instead of "model".
Option C is correct because the IAM policy's resource ARN incorrectly uses 'model' in the path, but Amazon Bedrock requires 'foundation-model' to reference foundation models. The correct ARN format for invoking a Bedrock foundation model is 'arn:aws:bedrock:region::foundation-model/model-id'. Using 'model' instead of 'foundation-model' causes the policy to not match any valid Bedrock resource, resulting in an invocation failure.
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 action should be "bedrock:InvokeModelWithResponseStream".
Why it's wrong here
InvokeModel is the correct action for synchronous invocation; InvokeModelWithResponseStream is for streaming.
✗
The resource ARN is missing the account ID.
Why it's wrong here
The account ID is present (123456789012).
✓
The ARN should use "foundation-model" instead of "model".
Why this is correct
The resource type for foundation models is 'foundation-model', not 'model'.
Related concept
Read the scenario before looking for a memorised answer.
✗
The statement is missing a condition for the model ID.
Why it's wrong here
Conditions are optional; the resource ARN already specifies the model ID.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between 'model' and 'foundation-model' in Bedrock ARNs, as candidates may assume all Bedrock models use the same resource type, overlooking that foundation models require a specific path.
Detailed technical explanation
How to think about this question
Amazon Bedrock uses a specific ARN format for foundation models: 'arn:aws:bedrock:region::foundation-model/model-id', where the account ID field is empty (::) because foundation models are managed by AWS, not customer accounts. This differs from custom models, which use 'arn:aws:bedrock:region:account-id:model/model-id'. In real-world scenarios, misconfiguring the resource type in IAM policies is a common cause of 'AccessDenied' errors, as the policy evaluation engine cannot match the ARN to the actual Bedrock resource.
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.
Applications of Foundation Models — This question tests Applications of Foundation Models — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ARN should use "foundation-model" instead of "model". — Option C is correct because the IAM policy's resource ARN incorrectly uses 'model' in the path, but Amazon Bedrock requires 'foundation-model' to reference foundation models. The correct ARN format for invoking a Bedrock foundation model is 'arn:aws:bedrock:region::foundation-model/model-id'. Using 'model' instead of 'foundation-model' causes the policy to not match any valid Bedrock resource, resulting in an invocation failure.
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.
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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