- A
Implement admission controller webhooks that check vulnerability scan results from the registry before allowing pod creation, and use a service mesh with mutual TLS to encrypt secrets.
Admission webhooks enforce policy at pod creation without runtime overhead; service mesh mTLS protects secrets.
- B
Use a custom script in Jenkins to parse the scan report and abort the build if vulnerabilities are found, and store secrets in Kubernetes secrets mounted as volumes.
Why wrong: Aborting the build only works within Jenkins; secrets mounted as volumes are still exposed.
- C
Deploy a runtime security agent that monitors container activity and rejects pods that contain known vulnerability signatures, and use Kubernetes RBAC to limit permissions.
Why wrong: Runtime agents add performance overhead and do not block deployment proactively.
- D
Configure a network policy in Kubernetes to restrict pod-to-pod communication, and use a static analysis tool during development to find coding flaws.
Why wrong: Network policies do not enforce vulnerability scanning or secret protection.
Quick Answer
The answer is implementing admission controller webhooks that check vulnerability scan results from the registry before allowing pod creation, paired with a service mesh using mutual TLS to encrypt secrets. This approach directly enforces container vulnerability scanning enforcement in CI/CD by blocking deployment at the Kubernetes API level, ensuring that no pod with critical or high-severity vulnerabilities can be created, regardless of how the deployment is triggered. On the CompTIA SecurityX CAS-004 exam, this scenario tests your understanding of shift-left security controls versus runtime monitoring, with a common trap being to choose a Jenkins build abort—which only blocks one pipeline path—or runtime agents that add performance overhead. The key insight is that admission controllers act as a policy gatekeeper at the cluster entry point, making them ideal for preventing untrusted container deployments without runtime impact. Memory tip: think of admission controllers as the bouncer at the club door—they check the ID (vulnerability scan) before anyone enters, so you don’t need security guards inside every room.
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.
An organization is migrating its on-premises monolithic application to a containerized microservices architecture on a Kubernetes cluster. The development team has created a set of Docker images that are stored in a private registry. The security team requires that all container images be scanned for vulnerabilities before deployment. The current CI/CD pipeline uses Jenkins to build images, push them to the registry, and then deploy to Kubernetes via kubectl. The scanning is performed by a tool that generates a report, but developers have been ignoring critical vulnerabilities and deploying anyway. The security team wants to enforce a policy that blocks deployment if the image has any critical or high-severity vulnerabilities. Additionally, the cluster must ensure that containers run with the least privilege and that secrets are not exposed in environment variables. The operations team is concerned about performance overhead from runtime security monitoring.
Which of the following approaches best addresses these requirements while minimizing operational overhead?
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.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
Implement admission controller webhooks that check vulnerability scan results from the registry before allowing pod creation, and use a service mesh with mutual TLS to encrypt secrets.
Option A is correct because admission controller webhooks can enforce vulnerability policies at deployment time, blocking pods with critical/high vulnerabilities without runtime overhead. Service mesh with mTLS encrypts secrets in transit, reducing exposure. Option B is incorrect because aborting the Jenkins build does not prevent deployment from other sources (e.g., direct kubectl) and secrets mounted as volumes are still vulnerable to compromise. Option C is incorrect because network policies do not address vulnerability scanning or secret protection. Option D is incorrect because runtime security agents incur performance overhead and do not block deployment upfront.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Implement admission controller webhooks that check vulnerability scan results from the registry before allowing pod creation, and use a service mesh with mutual TLS to encrypt secrets.
Why this is correct
Admission webhooks enforce policy at pod creation without runtime overhead; service mesh mTLS protects secrets.
Clue confirmation
The clue words "best", "least" in the question point toward this answer.
Related concept
Authentication checks who the user is.
- ✗
Use a custom script in Jenkins to parse the scan report and abort the build if vulnerabilities are found, and store secrets in Kubernetes secrets mounted as volumes.
Why it's wrong here
Aborting the build only works within Jenkins; secrets mounted as volumes are still exposed.
- ✗
Deploy a runtime security agent that monitors container activity and rejects pods that contain known vulnerability signatures, and use Kubernetes RBAC to limit permissions.
Why it's wrong here
Runtime agents add performance overhead and do not block deployment proactively.
- ✗
Configure a network policy in Kubernetes to restrict pod-to-pod communication, and use a static analysis tool during development to find coding flaws.
Why it's wrong here
Network policies do not enforce vulnerability scanning or secret protection.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CAS-004 questions on access control and AAA configuration.
- →
Scripting, Containers and Automation — study guide chapter
Learn the concepts, then practise the questions
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Scripting, Containers and Automation practice questions
Targeted practice on this topic area only
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CompTIA SecurityX CAS-004 study guide
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CAS-004 practice test guide
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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 — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Implement admission controller webhooks that check vulnerability scan results from the registry before allowing pod creation, and use a service mesh with mutual TLS to encrypt secrets. — Option A is correct because admission controller webhooks can enforce vulnerability policies at deployment time, blocking pods with critical/high vulnerabilities without runtime overhead. Service mesh with mTLS encrypts secrets in transit, reducing exposure. Option B is incorrect because aborting the Jenkins build does not prevent deployment from other sources (e.g., direct kubectl) and secrets mounted as volumes are still vulnerable to compromise. Option C is incorrect because network policies do not address vulnerability scanning or secret protection. Option D is incorrect because runtime security agents incur performance overhead and do not block deployment upfront.
What should I do if I get this CAS-004 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CAS-004 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "best", "least". 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?
Authentication checks who the user is.
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Last reviewed: Jun 24, 2026
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.
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