The answer is AWS Config, the service that provides a continuous record of configuration changes to AWS resources with detailed before-and-after state snapshots. This works because AWS Config continuously monitors and records every resource configuration change, storing a configuration history that allows you to review exactly what changed, when it changed, and what the previous state was. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of governance and compliance services, often appearing as a scenario where auditors need proof of no infrastructure modifications between two dates. A common trap is confusing AWS Config with AWS CloudTrail, but remember: CloudTrail records API activity (who did what), while Config records resource state changes (what changed). For a quick memory tip, think of Config as the "configuration historian" that captures the before-and-after of your resources, not the API calls that caused the change.
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 security team needs to demonstrate to auditors that no AWS infrastructure has been modified between two audit periods. Which AWS service provides a continuous record of configuration changes with before-and-after state for all resources?
Why wrong: CloudTrail records who made API calls and when — Config records the resulting configuration state changes (what the resource looked like before and after the change).
B
AWS Config
AWS Config provides a complete configuration history for each resource with before-and-after states — auditors can review exactly how resources were configured at any point in time and what changed.
C
Amazon CloudWatch
Why wrong: CloudWatch monitors metrics and logs — it doesn't maintain resource configuration history for audit purposes.
D
Amazon GuardDuty
Why wrong: GuardDuty detects active security threats — it doesn't provide configuration change history for infrastructure audit purposes.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Config
AWS Config is the correct service because it continuously records configuration changes to AWS resources and provides a detailed history of each change, including the before-and-after state. This allows the security team to demonstrate to auditors that no infrastructure modifications occurred between two audit periods by reviewing the configuration timeline and compliance snapshots.
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.
✗
AWS CloudTrail
Why it's wrong here
CloudTrail records who made API calls and when — Config records the resulting configuration state changes (what the resource looked like before and after the change).
✓
AWS Config
Why this is correct
AWS Config provides a complete configuration history for each resource with before-and-after states — auditors can review exactly how resources were configured at any point in time and what changed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon CloudWatch
Why it's wrong here
CloudWatch monitors metrics and logs — it doesn't maintain resource configuration history for audit purposes.
✗
Amazon GuardDuty
Why it's wrong here
GuardDuty detects active security threats — it doesn't provide configuration change history for infrastructure audit purposes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS CloudTrail (which logs API calls) with AWS Config (which records resource configuration states), but CloudTrail does not provide the before-and-after configuration state that auditors require for demonstrating no infrastructure changes.
Detailed technical explanation
How to think about this question
AWS Config uses a configuration recorder to capture configuration items (CIs) for supported resources, storing them as JSON documents in an S3 bucket and as timeline events in the Config service. Each change generates a configuration item that includes the previous and new state, along with metadata like the resource ID, change timestamp, and the AWS API call that triggered the change. This enables auditors to query the configuration history using the AWS Config console, CLI, or API, and to set up rules (e.g., 's3-bucket-public-read-prohibited') to evaluate compliance over time.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 — AWS Config is the correct service because it continuously records configuration changes to AWS resources and provides a detailed history of each change, including the before-and-after state. This allows the security team to demonstrate to auditors that no infrastructure modifications occurred between two audit periods by reviewing the configuration timeline and compliance snapshots.
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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Question Discussion
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