- A
AWS Service Control Policies (SCPs) to deny creation of resources without the tag.
Why wrong: SCPs can prevent creation but cannot remediate resources created without the tag.
- B
AWS CloudTrail to detect non-compliant resource creation and send notifications.
Why wrong: CloudTrail logs events but does not remediate.
- C
AWS Config rules with automatic remediation using AWS Systems Manager Automation or Lambda.
Config rules can detect non-compliance and trigger automated remediation.
- D
AWS Resource Groups & Tag Editor to manually add tags to non-compliant resources.
Why wrong: Tag Editor is a manual tool, not automated.
Question 1,648 of 1,750
Enforce Mandatory Tags Across Accounts with AWS Config
This DOP-C02 practice question tests your understanding of configuration management and iac. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 DevOps team manages a multi-account AWS environment using AWS Organizations. They need to enforce a mandatory tag (e.g., 'CostCenter') on all resources created across accounts. Which combination of services should be used to automatically remediate non-compliant resources?
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
✓
AWS Config rules with automatic remediation using AWS Systems Manager Automation or Lambda.
Option C is correct because AWS Config rules can evaluate resources for mandatory tags and trigger automatic remediation actions, such as AWS Systems Manager Automation or AWS Lambda functions, to add the missing tag. Option A is incorrect because SCPs only deny actions at the account level, but they do not remediate existing non-compliant resources or enforce tags on resources created outside the SCP scope. Option B is incorrect because CloudTrail only logs API calls and cannot automatically remediate non-compliant resources. Option D is incorrect because Tag Editor is a manual tool and does not provide automated enforcement or remediation.
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.
- ✗
AWS Service Control Policies (SCPs) to deny creation of resources without the tag.
Why it's wrong here
SCPs can prevent creation but cannot remediate resources created without the tag.
- ✗
AWS CloudTrail to detect non-compliant resource creation and send notifications.
Why it's wrong here
CloudTrail logs events but does not remediate.
- ✓
AWS Config rules with automatic remediation using AWS Systems Manager Automation or Lambda.
Why this is correct
Config rules can detect non-compliance and trigger automated remediation.
Related concept
Standard ACLs match source addresses.
- ✗
AWS Resource Groups & Tag Editor to manually add tags to non-compliant resources.
Why it's wrong here
Tag Editor is a manual tool, not automated.
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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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 DOP-C02 ACL questions on filtering logic and placement.
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Configuration Management and IaC — study guide chapter
Learn the concepts, then practise the questions
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Configuration Management and IaC practice questions
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Configuration Management and IaC — This question tests Configuration Management and IaC — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: AWS Config rules with automatic remediation using AWS Systems Manager Automation or Lambda. — Option C is correct because AWS Config rules can evaluate resources for mandatory tags and trigger automatic remediation actions, such as AWS Systems Manager Automation or AWS Lambda functions, to add the missing tag. Option A is incorrect because SCPs only deny actions at the account level, but they do not remediate existing non-compliant resources or enforce tags on resources created outside the SCP scope. Option B is incorrect because CloudTrail only logs API calls and cannot automatically remediate non-compliant resources. Option D is incorrect because Tag Editor is a manual tool and does not provide automated enforcement or remediation.
What should I do if I get this DOP-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 DOP-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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Last reviewed: Jun 20, 2026
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