The answer is to add a CreationPolicy with a timeout to the EC2 instance resource and use cfn-signal in the user data. This works because the CreationPolicy tells CloudFormation to pause stack creation until it receives a success signal, and the cfn-signal command, placed at the end of the user data script, explicitly notifies CloudFormation that the configuration has finished. On the AWS Certified Developer Associate DVA-C02 exam, this pattern tests your understanding of how to orchestrate resource readiness beyond simple dependency ordering—a common trap is confusing DependsOn, which only controls launch order, with the signal-based wait mechanism. Remember that CreationPolicy paired with cfn-signal is the modern, streamlined approach; the older WaitCondition and wait handle pattern is still valid but more complex. For the exam, think of it as a handshake: CloudFormation holds the stack open until the EC2 instance raises its hand with cfn-signal.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 using AWS CloudFormation to deploy a stack that includes an Amazon EC2 instance with user data. The user data script installs software and configures the application. The developer wants to ensure that the stack creation waits for the user data script to complete before marking the stack as CREATE_COMPLETE. What should the developer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a CreationPolicy with a timeout to the EC2 instance resource and use cfn-signal in the user data.
Option A is correct because a cfn-signal sent from the user data and a CreationPolicy on the EC2 resource cause CloudFormation to wait for the signal. Option B is wrong because DependsOn only affects order, not wait for completion. Option C is wrong because WaitCondition is legacy and requires a separate handle; CreationPolicy is simpler. Option D is wrong because user data runs as root; the script can send signals.
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.
✗
Add a DependsOn attribute to the EC2 instance resource.
Why it's wrong here
DependsOn only defines resource creation order, not completion of user data.
✗
Use a CloudFormation WaitCondition and a WaitConditionHandle.
Why it's wrong here
While possible, CreationPolicy is the modern approach for EC2.
✓
Add a CreationPolicy with a timeout to the EC2 instance resource and use cfn-signal in the user data.
Why this is correct
CreationPolicy waits for cfn-signal before completing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the EC2 instance to run the user data script as a service.
Why it's wrong here
Running as service does not signal CloudFormation; still need CreationPolicy.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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: Add a CreationPolicy with a timeout to the EC2 instance resource and use cfn-signal in the user data. — Option A is correct because a cfn-signal sent from the user data and a CreationPolicy on the EC2 resource cause CloudFormation to wait for the signal. Option B is wrong because DependsOn only affects order, not wait for completion. Option C is wrong because WaitCondition is legacy and requires a separate handle; CreationPolicy is simpler. Option D is wrong because user data runs as root; the script can send signals.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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
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