The answer is that environment variables or a config file are overriding the instance profile credentials. The AWS CLI uses a credential provider chain that checks environment variables like AWS_ACCESS_KEY_ID first, then the ~/.aws/credentials file, and only falls back to the EC2 instance metadata service (IMDS) as a last resort. If any of these earlier sources contain invalid or stale credentials, the CLI will never reach the instance profile, even though the IAM role is correctly attached and has the necessary permissions. On the AWS Certified Developer Associate DVA-C02 exam, this is a classic trap: developers assume that attaching an IAM role to an EC2 instance automatically makes the CLI use it, but the credential provider chain’s priority means explicit settings always win. To remember this, think of the chain as “Env, File, then Metadata”—if the first two are set, the instance profile is ignored.
DVA-C02 Security Practice Question
This DVA-C02 practice question tests your understanding of security. 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
Error: Unable to locate credentials. You can configure credentials by running "aws configure".
Refer to the exhibit. A developer runs an AWS CLI command on an EC2 instance and receives the error shown. The instance has an IAM role attached with the necessary permissions. What is the most likely cause of this error?
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 CLI is not configured to use the instance profile credentials; environment variables or config file might be overriding.
The error indicates that the AWS CLI cannot find credentials. Even though the EC2 instance has an IAM role attached, the CLI will not automatically use instance profile credentials if environment variables (e.g., AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY) or a config file (e.g., ~/.aws/credentials) are present with different or invalid values. The CLI's credential provider chain checks environment variables first, then the config file, and only falls back to the instance metadata service (IMDS) if no other credentials are found. Therefore, overriding settings are the most likely cause.
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 CLI command is not supported on EC2 instances.
Why it's wrong here
CLI works on EC2.
✓
The CLI is not configured to use the instance profile credentials; environment variables or config file might be overriding.
Why this is correct
Missing credentials configuration.
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 IAM role does not have the required permissions for the CLI command.
Why it's wrong here
Error is about credentials, not permissions.
✗
The instance does not have an IAM role attached.
Why it's wrong here
The stem says role is attached.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the IAM role is automatically used by the CLI, but they overlook that environment variables or a local AWS credentials file can override the instance profile credentials, causing a 'Unable to locate credentials' error even when the role is correctly attached.
Detailed technical explanation
How to think about this question
The AWS CLI credential provider chain prioritizes environment variables (AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN) over the instance profile credentials obtained from the IMDS (http://169.254.169.254/latest/meta-data/iam/security-credentials/). If any environment variable is set (even to an empty string), the CLI skips the IMDS lookup. This is a common misconfiguration when developers have previously configured local credentials and those settings persist on the EC2 instance, causing the CLI to fail to locate valid credentials.
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 — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CLI is not configured to use the instance profile credentials; environment variables or config file might be overriding. — The error indicates that the AWS CLI cannot find credentials. Even though the EC2 instance has an IAM role attached, the CLI will not automatically use instance profile credentials if environment variables (e.g., AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY) or a config file (e.g., ~/.aws/credentials) are present with different or invalid values. The CLI's credential provider chain checks environment variables first, then the config file, and only falls back to the instance metadata service (IMDS) if no other credentials are found. Therefore, overriding settings are the most likely cause.
What should I do if I get this DVA-C02 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 DVA-C02 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 DVA-C02 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.