This CKS practice question tests your understanding of supply chain security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 administrator wants to enforce that only images signed by a trusted key can run in the cluster. They have configured cosign and want to use a Kubernetes admission controller. Which tool should they deploy?
Helm
Why wrong: Helm is a package manager; it does not enforce admission policies.
Kube-bench
Why wrong: Kube-bench checks cluster compliance with CIS benchmarks; it does not enforce image signatures.
Prometheus
Why wrong: Prometheus is a monitoring tool, not an admission controller.
Kyverno with a verifyImages rule
Kyverno can be configured to verify container image signatures using cosign.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Kyverno with a verifyImages rule
Cosign integrates with Kubernetes via the cosign webhook or through policy engines like Kyverno. Kyverno can verify image signatures using cosign.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Helm
Why it's wrong here
Helm is a package manager; it does not enforce admission policies.
Kube-bench
Why it's wrong here
Kube-bench checks cluster compliance with CIS benchmarks; it does not enforce image signatures.
Prometheus
Why it's wrong here
Prometheus is a monitoring tool, not an admission controller.
Kyverno with a verifyImages rule
Why this is correct
Kyverno can be configured to verify container image signatures using cosign.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKS NAT questions on configuration and troubleshooting.
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FAQ
Supply Chain Security — This question tests Supply Chain Security — Static NAT maps one inside address to one outside address..
The correct answer is: Kyverno with a verifyImages rule — Cosign integrates with Kubernetes via the cosign webhook or through policy engines like Kyverno. Kyverno can verify image signatures using cosign.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKS NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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