CKS Minimize Microservice Vulnerabilities Practice Question
This CKS practice question tests your understanding of minimize microservice vulnerabilities. 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 practices help protect microservice applications against supply chain attacks? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use minimal base images (e.g., distroless or scratch) to reduce attack surface
Option B is correct because using minimal base images like distroless or scratch significantly reduces the attack surface by eliminating unnecessary packages, libraries, and utilities that could contain vulnerabilities. This aligns with the principle of least functionality, as fewer components mean fewer potential entry points for an attacker to exploit in a supply chain attack.
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.
✗
Use images from any public registry for flexibility
Why it's wrong here
Images from untrusted registries may contain malware.
✓
Use minimal base images (e.g., distroless or scratch) to reduce attack surface
Why this is correct
Smaller images have fewer packages that could contain vulnerabilities.
Related concept
Read the scenario before looking for a memorised answer.
✗
Always use the latest tag to get the most recent patches
Why it's wrong here
Latest tag can change unpredictably and may not be verified.
✓
Scan images for vulnerabilities using tools like Trivy or Clair
Why this is correct
Regular scanning identifies known CVEs in images.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable image verification using digital signatures (e.g., Notary or Cosign)
Why this is correct
Signature verification ensures the image hasn't been tampered with.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that using the latest tag is a safe practice for getting patches, when in fact it undermines supply chain security by breaking image immutability and reproducibility.
Detailed technical explanation
How to think about this question
Distroless images, such as those provided by Google, contain only the application and its runtime dependencies (e.g., glibc, OpenJDK) but no shell, package manager, or other utilities, which reduces the attack surface and the number of CVEs to scan. In a real-world scenario, a compromised base image with a backdoor in a package manager could be used to exfiltrate data; using a distroless image eliminates that vector entirely. Tools like Trivy and Clair perform static analysis of image layers against vulnerability databases (e.g., NVD, Red Hat OVAL), while Cosign enables cryptographic signing and verification using Sigstore, ensuring image integrity and provenance.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use minimal base images (e.g., distroless or scratch) to reduce attack surface — Option B is correct because using minimal base images like distroless or scratch significantly reduces the attack surface by eliminating unnecessary packages, libraries, and utilities that could contain vulnerabilities. This aligns with the principle of least functionality, as fewer components mean fewer potential entry points for an attacker to exploit in a supply chain attack.
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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