The answer is that the IAM role lacks the required permission, specifically `bedrock:InvokeModel`. This is the most likely cause of a Bedrock AccessDeniedException because the error is an authorization failure: the API call to invoke the model is rejected by AWS Identity and Access Management before Bedrock even checks model availability or service health. On the AWS Certified AI Practitioner AIF-C01 exam, this scenario tests your understanding of IAM policy enforcement as the first line of defense in service access—a common trap is to assume the model is unavailable or the region is unsupported, but the error code itself points directly to a permissions gap. Remember that Bedrock requires explicit allow statements for each action, and a missing `InvokeModel` permission is the classic culprit. Memory tip: “AccessDenied = Action not Allowed”—always check the IAM policy before troubleshooting anything else.
AIF-C01 Applications of Foundation Models Practice Question
This AIF-C01 practice question tests your understanding of applications of foundation models. 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.
Exhibit
Refer to the exhibit.
```
2024-03-15T10:00:00Z [ERROR] Model invocation failed: AccessDeniedException: User: arn:aws:iam::123456789012:role/BedrockRole is not authorized to perform: bedrock:InvokeModel on resource: arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-v2
```
A developer encounters the error shown above when using Amazon Bedrock. 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.
Refer to the exhibit.
```
2024-03-15T10:00:00Z [ERROR] Model invocation failed: AccessDeniedException: User: arn:aws:iam::123456789012:role/BedrockRole is not authorized to perform: bedrock:InvokeModel on resource: arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-v2
```
A
The model is not available in the region
Why wrong: The error does not mention model unavailability; it's an access issue.
B
The IAM role lacks the required permission
The error explicitly states the role is not authorized for the action.
C
The request is throttled
Why wrong: Throttling would show a ThrottlingException, not AccessDenied.
D
The model is out of service
Why wrong: Out of service would produce a different error, like ModelNotReadyException.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The IAM role lacks the required permission
The error indicates an access denied or authorization failure when invoking the Amazon Bedrock model. The most likely cause is that the IAM role used by the developer does not have the required permission, such as `bedrock:InvokeModel`, attached to its policy. Without this permission, the API call to Bedrock is rejected regardless of model availability or service status.
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 model is not available in the region
Why it's wrong here
The error does not mention model unavailability; it's an access issue.
✓
The IAM role lacks the required permission
Why this is correct
The error explicitly states the role is not authorized for the action.
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.
✗
The request is throttled
Why it's wrong here
Throttling would show a ThrottlingException, not AccessDenied.
✗
The model is out of service
Why it's wrong here
Out of service would produce a different error, like ModelNotReadyException.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between service availability errors and authorization errors, so the trap here is that candidates may confuse a permissions failure with a model unavailability or throttling issue, especially when the error message is generic.
Trap categories for this question
Command / output trap
Throttling would show a ThrottlingException, not AccessDenied.
Detailed technical explanation
How to think about this question
Amazon Bedrock uses AWS Identity and Access Management (IAM) to control access to models. The `bedrock:InvokeModel` permission must be explicitly granted in an IAM policy, and the policy must also allow access to the specific model ARN (e.g., `arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-v2`). Additionally, the IAM role may need a trust policy that allows the calling service (e.g., Lambda, EC2) to assume the role. In real-world scenarios, developers often forget to attach the required Bedrock permissions to their execution role, leading to this exact error.
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 IAM role lacks the required permission — The error indicates an access denied or authorization failure when invoking the Amazon Bedrock model. The most likely cause is that the IAM role used by the developer does not have the required permission, such as `bedrock:InvokeModel`, attached to its policy. Without this permission, the API call to Bedrock is rejected regardless of model availability or service status.
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.
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