Question 98 of 866
CKS trivy fs Practice Question
You are implementing supply chain security for container images. Which tool would you use to scan a local directory of Dockerfiles and Kubernetes manifests for known vulnerabilities?
⚠ Common exam trap
The trap is that candidates might think `trivy fs` only scans packages, but it can also scan configuration files like Dockerfiles and Kubernetes manifests for vulnerabilities. The exam tests the understanding that `trivy` is a multi-purpose tool, and `fs` is the appropriate subcommand for local directory scanning, not just `trivy image`.
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
✓
trivy fs
D is correct because `trivy fs` scans a local filesystem (including directories containing Dockerfiles and Kubernetes manifests) for known vulnerabilities. It parses these files, checks base images against vulnerability databases, and detects misconfigurations or CVEs. This tool is designed for supply chain security, covering both package vulnerabilities and infrastructure-as-code issues. The `fs` subcommand of trivy combines filesystem scanning with configuration analysis, making it suitable for the stated task.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
kubectl scan
Why it's wrong here
`kubectl scan` is not a standard kubectl command; it does not exist as a tool for vulnerability scanning.
- ✗
syft
Why it's wrong here
`syft` generates a Software Bill of Materials (SBOM), not vulnerability scanning. It is used for dependency listing, not for finding known vulnerabilities.
- ✗
cosign sign
Why it's wrong here
`cosign sign` is used for signing container images to ensure integrity, not for scanning vulnerabilities.
- ✓
trivy fs
Why this is correct
`trivy fs` scans a local directory for vulnerabilities, including those in Dockerfiles (via base image references) and Kubernetes manifests (via configuration analysis). It is the correct tool for this task.
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Last reviewed: Jul 4, 2026
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