The correct answer is to request a CloudFormation API rate limit increase from AWS Support, because the 'Rate exceeded' error in CodePipeline indicates you have hit the account-level throttling limit for CloudFormation API calls. CloudFormation enforces a default rate of 1 request per second per account per region for createStack and updateStack operations, and when multiple pipelines or parallel deployments exceed this threshold, the API rejects subsequent calls with a rate exceeded error. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of service quotas versus permission errors—a common trap is confusing rate limits with IAM or stack policy issues, which produce different error messages. Remember that 'Rate exceeded' always points to a throttling quota, not a permissions or configuration problem. A useful memory tip: think "RATE = Request Allowance Throttling Error" to distinguish it from access denied or policy failures.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. 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 using AWS CodePipeline for CI/CD with CloudFormation as the deployment action. The pipeline fails intermittently with the error 'Rate exceeded' when creating or updating stacks. What is the most likely cause and solution?
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 CloudFormation API rate limit is being hit; request a limit increase from AWS Support.
Option D is correct because CloudFormation has an account-level rate limit for API calls, and the error indicates the limit is being exceeded. The solution is to request a limit increase. Option A is wrong because CodePipeline does not have a rate limit that would cause this specific error. Option B is wrong because IAM permissions would cause an 'AccessDenied' error, not 'Rate exceeded'. Option C is wrong because stack policies do not cause rate limit errors.
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 stack has a stack policy that prevents updates; modify the stack policy.
Why it's wrong here
Stack policies cause update failures, not rate errors.
✗
The IAM role used by CloudFormation does not have sufficient permissions; update the role policy.
Why it's wrong here
Permission issues cause access denied errors, not rate exceeded.
✓
The CloudFormation API rate limit is being hit; request a limit increase from AWS Support.
Why this is correct
Rate exceeded errors indicate API throttling; increasing the limit resolves it.
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 pipeline is exceeding the CodePipeline execution frequency limit; reduce the number of pipeline executions.
Why it's wrong here
CodePipeline does not have a rate limit that produces this error.
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 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 DOP-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.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CloudFormation API rate limit is being hit; request a limit increase from AWS Support. — Option D is correct because CloudFormation has an account-level rate limit for API calls, and the error indicates the limit is being exceeded. The solution is to request a limit increase. Option A is wrong because CodePipeline does not have a rate limit that would cause this specific error. Option B is wrong because IAM permissions would cause an 'AccessDenied' error, not 'Rate exceeded'. Option C is wrong because stack policies do not cause rate limit errors.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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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