The answer is to use an AWS Config rule to check for the tag and a custom IAM policy to deny stack creation without the tag. This combination works because the Config rule continuously evaluates existing stacks for the mandatory CostCenter tag, while the IAM policy proactively prevents any user or role from creating or updating a CloudFormation stack that lacks the required tag, effectively enforcing compliance at the point of creation. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of preventive versus detective controls—a common trap is choosing a reactive Lambda remediation (which fixes non-compliance after creation) or relying on Service Catalog (which only governs provisioned products, not all stacks). The key distinction is that IAM policies block the action before it happens, making them the only fully automated enforcement method. Memory tip: think “Config checks, IAM blocks” to remember that detective rules need a preventive policy partner for true enforcement.
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 is using AWS CloudFormation to manage infrastructure. The security team requires that all CloudFormation stacks include a specific tag (CostCenter). The company wants to enforce this tag automatically. Which method should be used to enforce the tag?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an AWS Config rule to check for the tag and a custom IAM policy to deny stack creation without the tag.
Option C is correct because an AWS Config rule with an iam policy to deny non-compliant stacks is the most automated enforcement method. Option A is wrong because AWS Service Catalog does not enforce tags on existing stacks. Option B is wrong because Lambda can remediate but not prevent non-compliant stacks. Option D is wrong because tagging at the resource level is not automated enforcement.
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 AWS Service Catalog to enforce mandatory tags on all provisioned products.
Why it's wrong here
Service Catalog enforces tags on its products, not on all CloudFormation stacks.
✓
Use an AWS Config rule to check for the tag and a custom IAM policy to deny stack creation without the tag.
Why this is correct
Config can detect and IAM policy can prevent non-compliant stack creation.
Related concept
Standard ACLs match source addresses.
✗
Create an AWS Lambda function that checks for the tag and sends alerts.
Why it's wrong here
Lambda can detect but not prevent non-compliance proactively.
✗
Use AWS Resource Groups to tag resources after stack creation.
Why it's wrong here
Resource Groups do not enforce tag creation automatically.
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 an AWS Config rule to check for the tag and a custom IAM policy to deny stack creation without the tag. — Option C is correct because an AWS Config rule with an iam policy to deny non-compliant stacks is the most automated enforcement method. Option A is wrong because AWS Service Catalog does not enforce tags on existing stacks. Option B is wrong because Lambda can remediate but not prevent non-compliant stacks. Option D is wrong because tagging at the resource level is not automated enforcement.
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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