Question 305 of 510

Scripting, Containers and Automation →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to use Open Policy Agent (OPA) with Gatekeeper as an admission controller on Amazon EKS, and deploy EKS instead of ECS. This solution is correct because admission controller policy enforcement for container compliance operates at the cluster level, intercepting API requests to validate pod configurations before they are created—ensuring a read-only root filesystem and a non-root user are enforced at runtime, not just at build time. On the CompTIA SecurityX CAS-004 exam, this question tests your understanding of how Kubernetes admission controllers provide automated, auditable policy enforcement, contrasting them with infrastructure-as-code tools like Terraform, which handle provisioning but cannot enforce runtime behavior. A common trap is choosing Terraform because it’s used for compliance in deployment pipelines, but it lacks the real-time enforcement and audit trail that an admission controller provides. Memory tip: think “Gatekeeper guards the gate” at runtime, while Terraform only builds the door.

CAS-004 Scripting, Containers and Automation Practice Question

This CAS-004 practice question tests your understanding of scripting, containers and automation. 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 company uses Terraform to deploy infrastructure on AWS. They have a compliance requirement that all containers running on Amazon ECS must have a read-only root filesystem and must not run as root. The security team needs an automated way to enforce this policy and provide an audit trail for any violations. Which solution 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.

Question 1hardmultiple choice

Full question →

A
Review all container definitions manually during the change management process.
Why wrong: Manual review is error-prone and does not scale; automation is required for consistent enforcement.
B
Add a Terraform policy that validates container definitions at deployment time.
Why wrong: Terraform can validate configurations, but it cannot enforce runtime behavior once the container is running.
C
Write a custom Python script that periodically scans running ECS tasks and reports violations.
Why wrong: Scripts are reactive and do not prevent violations; they only detect after the fact.
D
Use Open Policy Agent (OPA) with Gatekeeper as an admission controller on Amazon EKS, and deploy EKS instead of ECS.
OPA/Gatekeeper enforces policies at runtime on Kubernetes, blocking non-compliant pods and providing audit logs. EKS replaced ECS to leverage this capability.

Full breakdown with real-world context →

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

✓

Use Open Policy Agent (OPA) with Gatekeeper as an admission controller on Amazon EKS, and deploy EKS instead of ECS.

Kubernetes admission controllers like OPA/Gatekeeper enforce policies on pods at runtime. Option C is correct. Terraform (A) is for provisioning but cannot enforce runtime behavior. Custom scripts (B) are reactive. Manual review (D) is 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.

✗
Review all container definitions manually during the change management process.
Why it's wrong here
Manual review is error-prone and does not scale; automation is required for consistent enforcement.
✗
Add a Terraform policy that validates container definitions at deployment time.
Why it's wrong here
Terraform can validate configurations, but it cannot enforce runtime behavior once the container is running.
✗
Write a custom Python script that periodically scans running ECS tasks and reports violations.
Why it's wrong here
Scripts are reactive and do not prevent violations; they only detect after the fact.
✓
Use Open Policy Agent (OPA) with Gatekeeper as an admission controller on Amazon EKS, and deploy EKS instead of ECS.
Why this is correct
OPA/Gatekeeper enforces policies at runtime on Kubernetes, blocking non-compliant pods and providing audit logs. EKS replaced ECS to leverage this capability.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.

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.

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FAQ

Questions learners often ask

What does this CAS-004 question test?

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 Open Policy Agent (OPA) with Gatekeeper as an admission controller on Amazon EKS, and deploy EKS instead of ECS. — Kubernetes admission controllers like OPA/Gatekeeper enforce policies on pods at runtime. Option C is correct. Terraform (A) is for provisioning but cannot enforce runtime behavior. Custom scripts (B) are reactive. Manual review (D) is not automated.

What should I do if I get this CAS-004 question wrong?

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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This CAS-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAS-004 exam.