The answer is to set a DeletionPolicy attribute to 'Retain' on the critical resource. This CloudFormation feature directly prevents accidental deletion by instructing the service to preserve the physical resource—such as an RDS database or an S3 bucket—even when the logical resource is removed from the stack template or the entire stack is deleted. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of lifecycle safeguards versus update controls; a common trap is confusing DeletionPolicy with StackPolicy, which only governs update permissions, not deletion behavior. Remember that TerminationProtection is an EC2-specific setting, not a CloudFormation-native feature, and ResourcePolicy does not exist in this context. For a quick memory tip, think “Retain to remain”—if you want the resource to survive a stack deletion or template removal, attach Retain to keep it alive.
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses AWS CloudFormation to manage infrastructure. A developer accidentally deletes a resource from the stack template, and the next stack update attempts to delete the resource. The SysOps administrator wants to prevent accidental deletion of critical resources. Which CloudFormation feature should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set a DeletionPolicy attribute to 'Retain' on the resource.
The correct answer is C because DeletionPolicy: Retain preserves the resource when the stack is deleted or the resource is removed from the template. Option A is incorrect because StackPolicy controls updates, not deletions. Option B is incorrect because TerminationProtection is for EC2 instances, not CloudFormation. Option D is incorrect because ResourcePolicy is not a CloudFormation feature.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable termination protection on the stack.
Why it's wrong here
Termination protection prevents stack deletion, not resource deletion within the stack.
✗
Stack policy to deny delete actions.
Why it's wrong here
Stack policy controls update permissions, not resource deletion.
✓
Set a DeletionPolicy attribute to 'Retain' on the resource.
Why this is correct
DeletionPolicy: Retain retains the resource when it's removed from the template.
Related concept
Static NAT maps one inside address to one outside address.
✗
Attach an IAM policy that denies cloudformation:DeleteStack.
Why it's wrong here
This prevents stack deletion, not resource deletion during update.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set a DeletionPolicy attribute to 'Retain' on the resource. — The correct answer is C because DeletionPolicy: Retain preserves the resource when the stack is deleted or the resource is removed from the template. Option A is incorrect because StackPolicy controls updates, not deletions. Option B is incorrect because TerminationProtection is for EC2 instances, not CloudFormation. Option D is incorrect because ResourcePolicy is not a CloudFormation feature.
What should I do if I get this SOA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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