← SOA-C02·Amazon Web Services

Question 559 of 1,546

Deployment, Provisioning, and Automation →mediumMultiple ChoiceObjective-mapped

CloudFormation Stack Policy to Prevent Replacement

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. A key principle to apply: stackPolicy defines update permissions for resources in a CloudFormation stack.. 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 SysOps administrator uses AWS CloudFormation to deploy a stack that includes an Amazon EC2 instance. The administrator wants to ensure that if the stack is updated, the EC2 instance is not accidentally replaced if its properties change. The administrator wants the stack update to fail when a property change would require replacement. Which CloudFormation feature should the administrator use?

A
CreationPolicy
Why wrong: CreationPolicy is used to wait for signals from resources before proceeding with stack creation; it does not affect updates or replacement prevention.
B
DeletionPolicy
Why wrong: DeletionPolicy determines what happens to a resource when its stack is deleted, not during updates; it does not prevent replacement.
C
StackPolicy
StackPolicy allows you to define update permissions for stack resources, including denying update actions that would cause replacement, effectively causing the update to fail if such changes are attempted. This meets the requirement.
D
UpdateReplacePolicy
Why wrong: UpdateReplacePolicy is a CloudFormation attribute that controls the disposition of a resource when it is replaced during an update (e.g., retain or delete), but it does not prevent the replacement from occurring. Therefore, it does not cause the update to fail; it only specifies what happens to the old resource after replacement.

Full breakdown with real-world context →

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

✓

StackPolicy

Option C, StackPolicy, is correct because a stack policy is a JSON document that defines which stack resources can be updated or replaced during a stack update. By setting a Deny effect on update actions for the EC2 instance, the administrator can prevent any property change that would cause replacement, causing the update to fail instead of replacing the instance. This directly meets the requirement to block accidental replacement.

Key principle: StackPolicy defines update permissions for resources in a CloudFormation stack.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
CreationPolicy
Why it's wrong here
CreationPolicy is used to wait for signals from resources before proceeding with stack creation; it does not affect updates or replacement prevention.
✗
DeletionPolicy
Why it's wrong here
DeletionPolicy determines what happens to a resource when its stack is deleted, not during updates; it does not prevent replacement.
✓
StackPolicy
Why this is correct
StackPolicy allows you to define update permissions for stack resources, including denying update actions that would cause replacement, effectively causing the update to fail if such changes are attempted. This meets the requirement.
Related concept
StackPolicy defines update permissions for resources in a CloudFormation stack.
✗
UpdateReplacePolicy
Why it's wrong here
UpdateReplacePolicy is a CloudFormation attribute that controls the disposition of a resource when it is replaced during an update (e.g., retain or delete), but it does not prevent the replacement from occurring. Therefore, it does not cause the update to fail; it only specifies what happens to the old resource after replacement.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse UpdateReplacePolicy (which manages what happens to the old resource after replacement) with a mechanism to prevent replacement, but UpdateReplacePolicy does not block the update—it only controls the disposition of the replaced resource.

Detailed technical explanation

How to think about this question

A StackPolicy is evaluated during any stack update operation (e.g., UpdateStack) and can include Effect: Deny on specific resource types (e.g., AWS::EC2::Instance) with a NotResource or Resource condition. Under the hood, CloudFormation checks the stack policy before applying changes; if a Deny matches the intended update action, the entire update fails with a 'StackPolicyViolation' error. This is useful in production environments where critical resources like database instances or EC2 instances must never be replaced inadvertently.

KKey Concepts to Remember

StackPolicy defines update permissions for resources in a CloudFormation stack.
It uses a JSON structure similar to IAM policies to specify actions and resources.
StackPolicy can prevent 'Update:Replace', 'Update:Delete', and 'Update:Modify' actions.
It is applied to the stack itself, not individual resources within the template.

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

StackPolicy defines update permissions for resources in a CloudFormation stack.

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. StackPolicy defines update permissions for resources in a CloudFormation stack. 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.

Review stackPolicy defines update permissions for resources in a CloudFormation stack., then practise related SOA-C02 questions on the same topic to reinforce the concept.

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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 — StackPolicy defines update permissions for resources in a CloudFormation stack..

What is the correct answer to this question?

The correct answer is: StackPolicy — Option C, StackPolicy, is correct because a stack policy is a JSON document that defines which stack resources can be updated or replaced during a stack update. By setting a Deny effect on update actions for the EC2 instance, the administrator can prevent any property change that would cause replacement, causing the update to fail instead of replacing the instance. This directly meets the requirement to block accidental replacement.

What should I do if I get this SOA-C02 question wrong?

Review stackPolicy defines update permissions for resources in a CloudFormation stack., then practise related SOA-C02 questions on the same topic to reinforce the concept.

What is the key concept behind this question?

StackPolicy defines update permissions for resources in a CloudFormation stack.

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Same concept, more angles

1 more ways this is tested on SOA-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A SysOps administrator uses AWS CloudFormation to deploy a stack that includes an Amazon EC2 instance and a security group. The administrator wants to ensure that when the stack is updated, the security group is not accidentally replaced if its properties change. The administrator wants to receive a failure if an update would require replacement of the security group. Which CloudFormation feature should the administrator use?

medium

A.Add a 'DeletionPolicy' attribute set to 'Retain' on the security group resource.
B.Add a 'CreationPolicy' attribute to the security group resource.
✓ C.Define a stack policy that denies replacement of the security group resource.
D.Use an 'UpdatePolicy' attribute with 'AutoScalingReplacingUpdate' on the security group.

Why C: Option C is correct because a stack policy can explicitly deny update actions that would replace a resource, such as the security group. By defining a stack policy with a Deny statement for the 'Replace' effect on the security group's logical resource ID, CloudFormation will fail the update if any property change triggers a replacement, preventing accidental deletion and recreation.

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