DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 developer is managing an application that runs on an Amazon EC2 instance. The application uses an IAM role attached to the instance to access an S3 bucket. The developer recently updated the IAM role to add a new policy that grants access to a different S3 bucket. However, when testing, the application cannot access the new bucket and still returns 'Access Denied'. The developer verifies that the instance profile is correctly associated with the EC2 instance and that the new policy is attached. The application was restarted after the policy change. What is the MOST likely cause of the issue?
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 temporary security credentials cached by the instance are still valid and do not reflect the new policy.
Option C is correct because the AWS SDK or CLI on the EC2 instance caches the temporary credentials from the instance metadata service. These credentials may not include the new policy if they were obtained before the policy update. The credentials are valid for a certain period (default 6 hours) and are not automatically refreshed when the role changes. Option A is wrong because the instance profile is correctly associated. Option B is wrong because restarting the application does not refresh the credentials; it uses the cached credentials. Option D is wrong because S3 bucket policies are not required; the IAM role policy is sufficient.
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 S3 bucket has a bucket policy that denies access to the IAM role.
Why it's wrong here
No bucket policy is mentioned; the IAM role policy should grant access.
✓
The temporary security credentials cached by the instance are still valid and do not reflect the new policy.
Why this is correct
The credentials are cached and will not include the new policy until they expire and are refreshed.
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 application needs to be restarted multiple times to pick up the new policy.
Why it's wrong here
Restarting does not refresh credentials; they are cached.
✗
The instance profile is not correctly attached to the EC2 instance.
Why it's wrong here
The developer verified the instance profile is correctly associated.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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.
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The temporary security credentials cached by the instance are still valid and do not reflect the new policy. — Option C is correct because the AWS SDK or CLI on the EC2 instance caches the temporary credentials from the instance metadata service. These credentials may not include the new policy if they were obtained before the policy update. The credentials are valid for a certain period (default 6 hours) and are not automatically refreshed when the role changes. Option A is wrong because the instance profile is correctly associated. Option B is wrong because restarting the application does not refresh the credentials; it uses the cached credentials. Option D is wrong because S3 bucket policies are not required; the IAM role policy is sufficient.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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Question Discussion
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