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SOA-C02 Practice Question: CloudFormation stack policy to prevent accidental…
This SOA-C02 practice question tests your understanding of cloudformation stack policy to prevent accidental…. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: cloudFormation stack policy. 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 manages an RDS database, an S3 bucket, and several Lambda functions. During a recent stack update, a property change caused CloudFormation to replace the RDS instance, deleting the database and re-creating it — resulting in data loss. The team wants to prevent any future stack update from replacing or deleting the RDS instance without an explicit override. What CloudFormation feature accomplishes this?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Enable deletion protection on the RDS instance to prevent CloudFormation from deleting it
RDS deletion protection prevents accidental deletion through the API or console, and also causes CloudFormation delete-stack to fail for that resource. However, deletion protection does not prevent CloudFormation from replacing the instance (replacing creates a new instance and deletes the old one). A stack policy must be used to block the Replace action.
B
Distractor review
Use CloudFormation change sets to preview the update and manually reject any change set that includes a replacement
Change sets allow previewing before executing, which is good practice. However, if the operator forgets to review or a CI/CD pipeline applies the change set automatically, the replacement can still occur. A stack policy enforces the protection automatically without relying on human review.
C
Distractor review
Add a DeletionPolicy: Retain attribute to the RDS resource in the template
DeletionPolicy: Retain prevents CloudFormation from deleting the physical resource when the logical resource is removed from the stack or the stack is deleted. It does not prevent CloudFormation from replacing the resource due to a property change during a stack update — that is controlled by the UpdateReplacePolicy attribute (also Retain) and the stack policy.
D
Best answer
Set a stack policy that denies Replace and Delete actions on the RDS resource; require an override policy to be explicitly provided when a replacement is intentional
The stack policy evaluates each update action per resource. A Deny on Replace for the RDS logical resource ID prevents CloudFormation from completing any update that would recreate the database — the update fails with a clear policy error. A temporary override policy passed via --stack-policy-during-update can explicitly allow the replacement for a deliberate migration.
Common exam trap
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.
Technical deep dive
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- CloudFormation stack policy
- resource update protection
- Replacement action
- StatefulResources
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
CloudFormation stack policy
Related practice questions
Related SOA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A company uses Amazon CloudFront to deliver content to a global audience. The origin is an Application Load Balancer in us-east-1. The SysOps administrator wants to reduce costs by minimizing the number of requests that reach the origin server. Which action should the administrator take?
Question 2
A company runs a batch processing application on Amazon EC2 that runs for 2 hours every night. The workload can tolerate interruptions. Which EC2 purchasing option provides the lowest cost for this use case?
Question 3
A SysOps administrator needs to monitor the CPU utilization of an Amazon RDS DB instance and receive an alarm when CPU utilization exceeds 80% for 5 consecutive minutes. Which AWS service should be used to create this alarm?
Question 4
A company runs a critical web application on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The application uses session stickiness (sticky sessions) to maintain user sessions. The SysOps administrator notices that when instances are replaced during a scale-in or failure event, users lose their session data. The administrator needs to preserve session data across instance failures without losing stickiness benefits. What should the administrator do?
Question 5
A company runs a production web application on a single Amazon EC2 instance. The application experiences a predictable and steady workload 24/7. The SysOps administrator wants to minimize compute costs for this instance while ensuring it remains available during the expected workload. Which EC2 purchasing option should the administrator use?
Question 6
A company has a VPC with public and private subnets. The private subnets host application servers that need to make outbound HTTPS connections to the internet. The SysOps administrator must implement a solution that provides outbound internet connectivity while preventing inbound connections from the internet. Additionally, the solution must allow the company to control which domains the application servers can access. Which solution should the administrator implement?
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
CloudFormation stack policy
What is the correct answer to this question?
The correct answer is: Set a stack policy that denies Replace and Delete actions on the RDS resource; require an override policy to be explicitly provided when a replacement is intentional — A CloudFormation stack policy is a JSON document that controls which update actions are allowed on specific stack resources. By default, all updates are allowed. A stack policy with Deny on the Replace and Delete actions for the RDS resource prevents CloudFormation from performing those destructive operations during a normal stack update. To override the protection for a legitimate replacement, a temporary override policy must be explicitly passed during the update — the protection cannot be bypassed by accident.
What should I do if I get this SOA-C02 question wrong?
Review cloudFormation stack policy, then practise related SOA-C02 questions on the same topic to reinforce the concept.
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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.