The answer is AWS Config with managed rules and custom Lambda functions for auto-remediation. This approach directly meets the requirement for automated security policy enforcement across multiple AWS accounts because it uses code—specifically, JSON-based Config rules and Lambda functions—to define compliance standards and trigger automatic remediation actions when violations are detected. On the CompTIA SecurityX CAS-004 exam, this scenario tests your understanding of cloud-native policy-as-code tools versus manual or reactive alternatives; a common trap is confusing AWS Config with third-party tools like Terraform or CloudFormation, which are for provisioning, not continuous enforcement. Remember that AWS Config is the detective and corrective service, while Lambda provides the automated fix—think of it as “Config catches, Lambda corrects.” For the exam, associate the phrase “automated security policy enforcement AWS” directly with Config rules plus Lambda, not with manual audits or separate infrastructure-as-code tools.
CAS-004 Scripting, Containers and Automation Practice Question
This CAS-004 practice question tests your understanding of scripting, containers and automation. 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 security team needs to automate the enforcement of cloud security policies across multiple accounts in AWS. They want a solution that uses code to define policies and automatically remediate violations. Which approach best meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Config with managed rules and custom Lambda functions for auto-remediation.
AWS Config Rules with custom Lambda functions can automate remediation. Option C is correct. Option A is manual. Option B is a separate tool. Option D is reactive, not automated.
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.
✗
Write Python boto3 scripts that run on a schedule to check and update security groups.
Why it's wrong here
Scripts are custom and require maintenance; they do not provide a unified policy framework.
✓
Use AWS Config with managed rules and custom Lambda functions for auto-remediation.
Why this is correct
AWS Config rules are defined in code (JSON) and remediation via Lambda automates enforcement.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable AWS GuardDuty and rely on its threat detection alerts.
Why it's wrong here
GuardDuty detects threats but does not enforce policies or automate remediation.
✗
Deploy a third-party cloud security posture management (CSPM) tool like Prisma Cloud.
Why it's wrong here
CSPM is effective but is a separate tool, not 'code-defined' policies; the requirement is for code-defined automation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Config with managed rules and custom Lambda functions for auto-remediation. — AWS Config Rules with custom Lambda functions can automate remediation. Option C is correct. Option A is manual. Option B is a separate tool. Option D is reactive, not automated.
What should I do if I get this CAS-004 question wrong?
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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