- A
Use the DeletionPolicy attribute to retain resources.
Why wrong: DeletionPolicy only applies when the stack is deleted, not updated.
- B
Apply a stack policy to protect critical resources.
Stack policies prevent accidental updates to protected resources.
- C
Use a rolling update strategy with an appropriate batch size.
Rolling updates update instances in batches, minimizing downtime.
- D
Use Change Sets to preview stack updates.
Change sets let you see how changes will affect running resources.
- E
Use nested stacks to isolate components.
Why wrong: Nested stacks help with organization but don't directly prevent downtime.
Question 1,140 of 1,746
Strategies to Avoid Downtime During CloudFormation Stack Updates
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company is using AWS CloudFormation to deploy infrastructure. They want to ensure that updates to a stack do not cause downtime for a critical web application. Which THREE strategies should they consider? (Choose THREE.)
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
✓
Apply a stack policy to protect critical resources.
The correct answers are B, C, D. Option B: Apply a stack policy to protect critical resources. A stack policy is an IAM resource-based policy that controls which stack resources can be updated or deleted. By setting a stack policy with a Deny for updates on critical resources, you prevent accidental modification during stack updates, thus reducing downtime risk. Option C: Use a rolling update strategy with an appropriate batch size. When updating an Auto Scaling group or other resources that support rolling updates, you can configure the update policy to update instances in batches. This minimizes downtime by ensuring that only a portion of the instances are replaced at a time, keeping the application available. Option D: Use Change Sets to preview stack updates. Change sets allow you to review the changes that will be made to your stack before executing them. This helps identify potential issues or unintended modifications that could cause downtime, giving you a chance to reject the changes. Option A is incorrect because the DeletionPolicy attribute is used to preserve or back up resources when a stack is deleted, not during updates. It does not prevent downtime during updates. Option E is incorrect because nested stacks help organize resources into reusable components but do not inherently prevent downtime during updates; they are a management and modularity tool, not a downtime prevention strategy.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use the DeletionPolicy attribute to retain resources.
Why it's wrong here
DeletionPolicy only applies when the stack is deleted, not updated.
- ✓
Apply a stack policy to protect critical resources.
Why this is correct
Stack policies prevent accidental updates to protected resources.
Related concept
Standard ACLs match source addresses.
- ✓
Use a rolling update strategy with an appropriate batch size.
Why this is correct
Rolling updates update instances in batches, minimizing downtime.
Related concept
Standard ACLs match source addresses.
- ✓
Use Change Sets to preview stack updates.
Why this is correct
Change sets let you see how changes will affect running resources.
Related concept
Standard ACLs match source addresses.
- ✗
Use nested stacks to isolate components.
Why it's wrong here
Nested stacks help with organization but don't directly prevent downtime.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
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Continuous Improvement for Existing Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Apply a stack policy to protect critical resources. — The correct answers are B, C, D. Option B: Apply a stack policy to protect critical resources. A stack policy is an IAM resource-based policy that controls which stack resources can be updated or deleted. By setting a stack policy with a Deny for updates on critical resources, you prevent accidental modification during stack updates, thus reducing downtime risk. Option C: Use a rolling update strategy with an appropriate batch size. When updating an Auto Scaling group or other resources that support rolling updates, you can configure the update policy to update instances in batches. This minimizes downtime by ensuring that only a portion of the instances are replaced at a time, keeping the application available. Option D: Use Change Sets to preview stack updates. Change sets allow you to review the changes that will be made to your stack before executing them. This helps identify potential issues or unintended modifications that could cause downtime, giving you a chance to reject the changes. Option A is incorrect because the DeletionPolicy attribute is used to preserve or back up resources when a stack is deleted, not during updates. It does not prevent downtime during updates. Option E is incorrect because nested stacks help organize resources into reusable components but do not inherently prevent downtime during updates; they are a management and modularity tool, not a downtime prevention strategy.
What should I do if I get this SAP-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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Same concept, more angles
1 more ways this is tested on SAP-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 company uses AWS CloudFormation to deploy infrastructure. They need to ensure that updates to a stack do not cause downtime for a critical database. Which TWO strategies should they use?
easy- A.Create a new stack and migrate data.
- ✓ B.Use an UpdatePolicy attribute for rolling updates.
- C.Disable rollback on stack update failures.
- D.Use a service role for CloudFormation.
- ✓ E.Use a DeletionPolicy attribute of Retain on the database resource.
Why B: Correct answers are B and E. Option B: Using an UpdatePolicy attribute allows you to control how updates are applied, such as rolling updates across instances, which minimizes downtime. Option E: Setting a DeletionPolicy of Retain on the database resource ensures that the database is not deleted during stack updates or deletions, preventing accidental data loss and downtime. Option A is incorrect because creating a new stack would require data migration, which can cause downtime. Option C is incorrect because disabling rollback does not prevent downtime; it can leave the stack in a failed state. Option D is incorrect because a service role controls permissions, not update behavior.
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Last reviewed: Jun 20, 2026
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