This CKS practice question tests your understanding of system hardening. 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.
Which THREE of the following are recommended practices for securing container images in a Kubernetes environment?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Scan images for vulnerabilities before deployment
Option A is correct because scanning container images for vulnerabilities before deployment is a fundamental security practice in Kubernetes environments. Tools like Trivy, Clair, or Anchore Grype can identify known CVEs in the base image and application dependencies, allowing teams to remediate issues before the image is run. This aligns with the principle of shifting security left and is a key requirement for compliance with standards like the NIST Application Container Security Guide.
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.
✓
Scan images for vulnerabilities before deployment
Why this is correct
Identifies known CVEs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store sensitive configuration data directly in the image
Why it's wrong here
Secrets should not be baked into images; use Kubernetes Secrets or external vaults.
✓
Use imagePullSecrets to restrict which images can be pulled from registries
Why this is correct
Prevents unauthorized images from being pulled.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use minimal base images like distroless or scratch
Why this is correct
Reduces the number of tools and libraries that could be exploited.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run containers as root to avoid permission issues
Why it's wrong here
Running as root increases risk of privilege escalation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that `imagePullSecrets` (Option C) are used to restrict which images can be pulled from registries, but in reality, `imagePullSecrets` only authenticate to private registries and do not enforce any access control or policy on which images are allowed to be pulled; for restriction, you need an admission controller like OPA/Gatekeeper or a registry firewall.
Detailed technical explanation
How to think about this question
Under the hood, image scanning works by comparing the package manifests (e.g., dpkg status, RPM database, or Alpine APK index) against a vulnerability database like the National Vulnerability Database (NVD) or OS-specific advisories. For minimal base images like distroless or scratch, the attack surface is drastically reduced because they contain no shell, package manager, or unnecessary binaries, which also means fewer packages to scan and fewer false positives. A real-world scenario is the Log4j vulnerability (CVE-2021-44228), where scanning images for the affected library version could have prevented exploitation in Kubernetes clusters.
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 practitioner preparing for the CKS 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
System Hardening — This question tests System Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Scan images for vulnerabilities before deployment — Option A is correct because scanning container images for vulnerabilities before deployment is a fundamental security practice in Kubernetes environments. Tools like Trivy, Clair, or Anchore Grype can identify known CVEs in the base image and application dependencies, allowing teams to remediate issues before the image is run. This aligns with the principle of shifting security left and is a key requirement for compliance with standards like the NIST Application Container Security Guide.
What should I do if I get this CKS 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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