This DVA-C02 practice question tests your understanding of deployment. 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 CloudFormation stack update fails and rolls back. Which two practices help diagnose and reduce future deployment risk?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review stack events and resource status reasons
Option A is correct because reviewing stack events and resource status reasons in CloudFormation provides detailed error messages for each resource that failed during the update. This allows you to pinpoint the exact cause of the failure, such as insufficient IAM permissions, a resource limit exceeded, or a dependency conflict. Analyzing these events is essential for diagnosing issues and preventing similar failures in future deployments.
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.
✓
Review stack events and resource status reasons
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete the stack immediately without checking events
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
✓
Create and inspect change sets before high-risk updates
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable rollback for all production deployments permanently
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think disabling rollback is a valid troubleshooting step for production, but the exam emphasizes that rollback is a safety feature that should not be permanently disabled, as it prevents partial updates that could leave infrastructure in an inconsistent state.
Detailed technical explanation
How to think about this question
CloudFormation stack events are stored in the `StackEvents` API and include a `ResourceStatusReason` field that often contains specific error codes from AWS services, such as `RateExceeded` from EC2 or `AccessDenied` from IAM. Change sets (Option C) allow you to preview the exact changes before execution, including detecting whether a resource replacement will occur, which is a common cause of unintended downtime. In a real-world scenario, a stack update might fail because a security group rule references a non-existent CIDR block; reviewing events reveals the exact resource and reason, while a change set would have flagged the invalid reference before the update.
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Review stack events and resource status reasons — Option A is correct because reviewing stack events and resource status reasons in CloudFormation provides detailed error messages for each resource that failed during the update. This allows you to pinpoint the exact cause of the failure, such as insufficient IAM permissions, a resource limit exceeded, or a dependency conflict. Analyzing these events is essential for diagnosing issues and preventing similar failures in future deployments.
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.
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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