- A
Add a CreationPolicy with a resource signal to the EC2 instance resource and have the user data script send a success signal using cfn-signal.
CreationPolicy with signal ensures CloudFormation waits for the user data script to complete and signal success.
- B
Add a DependsOn attribute to the EC2 instance resource to wait for another resource.
Why wrong: DependsOn does not wait for user data completion.
- C
Add an UpdatePolicy with a resource signal to the EC2 instance resource.
Why wrong: UpdatePolicy is for updates, not initial creation.
- D
Add a WaitCondition resource and a WaitHandle, and have the user data script send a signal to the WaitHandle.
Why wrong: WaitCondition can be used but requires additional resources; CreationPolicy is simpler for EC2 instances.
Quick Answer
The answer is to add a CreationPolicy with a resource signal to the EC2 instance resource and have the user data script send a success signal using cfn-signal. This is correct because a CreationPolicy tells CloudFormation to wait for a specified number of success signals before marking the resource as CREATE_COMPLETE, directly addressing the need to wait for user data script completion. Without this policy, CloudFormation considers the instance created as soon as the API call returns, ignoring whether the user data script has finished or failed. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this concept tests your understanding of stack creation dependencies beyond simple resource ordering—a common trap is confusing CreationPolicy with DependsOn, which only waits for resource creation, not script execution. Remember the mnemonic: "CreationPolicy signals success; DependsOn just checks existence."
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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 has a CloudFormation stack that creates an Amazon EC2 instance with a user data script that installs software from the internet. The stack creation is failing with a timeout. The SysOps administrator suspects that the user data script is taking too long or failing. How can the administrator configure the stack to wait for the user data script to complete successfully before marking the instance as CREATE_COMPLETE?
Answer choices
Why each option matters
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 resource signal to the EC2 instance resource and have the user data script send a success signal using cfn-signal.
Use a CreationPolicy with a resource signal on the EC2 instance. The user data script must send a success signal (e.g., via cfn-signal) to CloudFormation. Option B is wrong because WaitCondition is used for external signals but requires a separate wait handle. Option C is wrong because UpdatePolicy is for updates, not creation. Option D is wrong because DependsOn only waits for resource creation, not for user data completion.
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 CreationPolicy with a resource signal to the EC2 instance resource and have the user data script send a success signal using cfn-signal.
Why this is correct
CreationPolicy with signal ensures CloudFormation waits for the user data script to complete and signal success.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Add a DependsOn attribute to the EC2 instance resource to wait for another resource.
Why it's wrong here
DependsOn does not wait for user data completion.
- ✗
Add an UpdatePolicy with a resource signal to the EC2 instance resource.
Why it's wrong here
UpdatePolicy is for updates, not initial creation.
- ✗
Add a WaitCondition resource and a WaitHandle, and have the user data script send a signal to the WaitHandle.
Why it's wrong here
WaitCondition can be used but requires additional resources; CreationPolicy is simpler for EC2 instances.
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 SOA-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.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — 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 resource signal to the EC2 instance resource and have the user data script send a success signal using cfn-signal. — Use a CreationPolicy with a resource signal on the EC2 instance. The user data script must send a success signal (e.g., via cfn-signal) to CloudFormation. Option B is wrong because WaitCondition is used for external signals but requires a separate wait handle. Option C is wrong because UpdatePolicy is for updates, not creation. Option D is wrong because DependsOn only waits for resource creation, not for user data completion.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-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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Last reviewed: Jun 20, 2026
This SOA-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 SOA-C02 exam.
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