The answer is AWS Config with the required-tags rule. This service continuously evaluates your AWS resources against a managed rule that checks for the presence of a specific tag, such as 'CostCenter', and automatically flags any resource missing that tag as non-compliant. AWS Config records every configuration change, runs evaluations against your defined rules, and surfaces results in a compliance dashboard, with the ability to trigger Amazon SNS notifications for real-time reporting. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of which service handles ongoing compliance monitoring versus one-time audits—a common trap is choosing AWS Tag Editor or Resource Groups, which are manual tools, not continuous evaluators. Remember the key distinction: AWS Config is the only service that continuously monitors and reports on tag compliance over time. A helpful memory tip is to think of Config as your "compliance cop" that constantly patrols for missing tags.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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's compliance team needs to know which AWS resources are not compliant with the company's tagging policy (all resources must have a 'CostCenter' tag). Which AWS service can continuously evaluate and report on this compliance?
Why wrong: CloudWatch monitors metrics and logs — it doesn't evaluate resource configuration compliance like tag presence.
B
AWS Config with the required-tags rule
AWS Config continuously evaluates all in-scope resources and the 'required-tags' managed rule flags any resources missing required tags like 'CostCenter', generating non-compliance findings.
C
AWS Trusted Advisor
Why wrong: Trusted Advisor has some tagging checks but doesn't provide the continuous evaluation and custom tag key compliance checking that Config rules provide.
D
AWS CloudTrail
Why wrong: CloudTrail records who created resources and whether tags were applied at creation — it doesn't continuously evaluate current tag compliance across all resources.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Config with the required-tags rule
AWS Config with the managed 'required-tags' rule can continuously evaluate whether resources have the specified tag (e.g., 'CostCenter') and report non-compliant resources. AWS Config records configuration changes, evaluates them against rules, and provides a compliance dashboard and notifications via Amazon SNS, making it the correct service for ongoing compliance monitoring.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Amazon CloudWatch
Why it's wrong here
CloudWatch monitors metrics and logs — it doesn't evaluate resource configuration compliance like tag presence.
✓
AWS Config with the required-tags rule
Why this is correct
AWS Config continuously evaluates all in-scope resources and the 'required-tags' managed rule flags any resources missing required tags like 'CostCenter', generating non-compliance findings.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Trusted Advisor
Why it's wrong here
Trusted Advisor has some tagging checks but doesn't provide the continuous evaluation and custom tag key compliance checking that Config rules provide.
✗
AWS CloudTrail
Why it's wrong here
CloudTrail records who created resources and whether tags were applied at creation — it doesn't continuously evaluate current tag compliance across all resources.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Config (configuration compliance) with AWS CloudTrail (API auditing) or Amazon CloudWatch (performance monitoring), assuming any 'monitoring' service can handle tag compliance, but only AWS Config provides continuous, rule-based evaluation of resource configurations.
Detailed technical explanation
How to think about this question
AWS Config evaluates resources by recording configuration items (CIs) and comparing them against rules defined in AWS Config managed rules or custom Lambda functions. The 'required-tags' rule uses a JSON policy to specify tag keys and values, and AWS Config triggers evaluations on configuration changes or at a periodic interval (e.g., every 6 hours). In a real-world scenario, if a developer launches an EC2 instance without the 'CostCenter' tag, AWS Config can automatically flag it as non-compliant and trigger a remediation action via AWS Systems Manager Automation.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CLF-C02 question in full detail.
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Config with the required-tags rule — AWS Config with the managed 'required-tags' rule can continuously evaluate whether resources have the specified tag (e.g., 'CostCenter') and report non-compliant resources. AWS Config records configuration changes, evaluates them against rules, and provides a compliance dashboard and notifications via Amazon SNS, making it the correct service for ongoing compliance monitoring.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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