The answer is to use a CloudFormation stack policy with a deny effect for resource creation without tags. This approach is correct because a stack policy acts as a guardrail at the stack level, explicitly denying any resource creation or update action that does not include the required CostCenter tag, thereby enforcing compliance before the resource is ever provisioned. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this tests your understanding of proactive governance versus reactive remediation—a common trap is choosing AWS Config rules, which detect non-compliance but require additional automation for automatic remediation, whereas a stack policy prevents the violation from occurring in the first place. Remember the mnemonic “Deny before you try” to recall that stack policies block non-compliant actions at creation time, making them the most effective method for enforcing tagging on all CloudFormation stack resources.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 deploy infrastructure. The team wants to ensure that all resources are tagged with a CostCenter tag. They want to automatically remediate any stack that creates resources without the required tag. Which approach is MOST effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a CloudFormation stack policy with a deny effect for resource creation without tags.
Option C is correct because CloudFormation stack policies can enforce tagging at the stack level by denying creation of resources without tags. Option A is wrong because AWS Config rules can detect but may not automatically remediate without additional setup. Option B is wrong because resource-level permissions would require modifying each service's policy. Option D is wrong because a Lambda function would be reactive and may have a delay.
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.
✗
Create a Lambda function that tags resources after creation.
Why it's wrong here
This is reactive and may not meet compliance requirements for immediate tagging.
✗
Use IAM policies to require tagging on all resource creation.
Why it's wrong here
IAM policies can enforce tagging on specific actions but require per-service configuration.
✓
Use a CloudFormation stack policy with a deny effect for resource creation without tags.
Why this is correct
Stack policies can be applied to CloudFormation stacks to enforce tagging.
Related concept
Standard ACLs match source addresses.
✗
Use an AWS Config rule with auto-remediation via SSM Automation.
Why it's wrong here
Auto-remediation can work but is more complex and may not cover all resources.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
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: Use a CloudFormation stack policy with a deny effect for resource creation without tags. — Option C is correct because CloudFormation stack policies can enforce tagging at the stack level by denying creation of resources without tags. Option A is wrong because AWS Config rules can detect but may not automatically remediate without additional setup. Option B is wrong because resource-level permissions would require modifying each service's policy. Option D is wrong because a Lambda function would be reactive and may have a delay.
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.
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Question Discussion
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