The correct answer is to add a stage to the Jenkins pipeline that runs container image scanning using Trivy before pushing to the registry. This is the most effective automation because it shifts security left, integrating container image scanning directly into the CI/CD pipeline so vulnerabilities are detected and blocked before the image is ever stored or deployed. For the CompTIA SecurityX CAS-004 exam, this question tests your understanding of DevSecOps principles and the practical implementation of automated security gates within a CI/CD workflow. A common trap is choosing post-deployment scanning, which fails to prevent risk, or relying on manual developer checks, which introduces inconsistency. The key distinction is that tools like Trivy or Clair operate as pipeline stages, enforcing policy at build time rather than after the fact. Memory tip: think "scan before you stash"—run the image scanner in the CI stage, before the image hits the registry, to catch flaws early.
CAS-004 Scripting, Containers and Automation Practice Question
This CAS-004 practice question tests your understanding of scripting, containers and automation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 a CI/CD pipeline with Jenkins to build and deploy containerized applications. Security scanning of container images is currently done manually after deployment, causing delays. Which of the following would be the most effective automation to improve security and efficiency?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a stage to the Jenkins pipeline that runs container image scanning using Trivy before pushing to the registry.
Integrating image scanning into the CI pipeline ensures vulnerabilities are detected before deployment. Option C is correct because tools like Trivy or Clair can be run as pipeline stages. Option A is incorrect because relying on developers is inconsistent. Option B is incorrect because scanning after deployment doesn't prevent vulnerabilities. Option D is incorrect because infrastructure as code does not directly address image scanning.
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.
✓
Add a stage to the Jenkins pipeline that runs container image scanning using Trivy before pushing to the registry.
Why this is correct
Automated scanning in the pipeline catches vulnerabilities before deployment, enforcing security earlier.
Related concept
Read the scenario before looking for a memorised answer.
✗
Schedule a weekly cron job to scan the container registry and generate reports.
Why it's wrong here
Delayed scanning allows vulnerabilities to be deployed before detection.
✗
Use Terraform to enforce that only images from a trusted registry are deployed.
Why it's wrong here
Terraform controls infrastructure provisioning but does not replace image scanning.
✗
Require developers to scan images locally using a Dockerfile HEALTHCHECK instruction.
Why it's wrong here
HEALTHCHECK is for runtime health, not vulnerability scanning, and relies on manual effort.
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: Add a stage to the Jenkins pipeline that runs container image scanning using Trivy before pushing to the registry. — Integrating image scanning into the CI pipeline ensures vulnerabilities are detected before deployment. Option C is correct because tools like Trivy or Clair can be run as pipeline stages. Option A is incorrect because relying on developers is inconsistent. Option B is incorrect because scanning after deployment doesn't prevent vulnerabilities. Option D is incorrect because infrastructure as code does not directly address image scanning.
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.
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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