This CKS practice question tests your understanding of supply chain security. 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.
An administrator wants to verify that an image was signed by a specific key before deploying. Which Cosign command should be used?
cosign verify --key mykey.pub myimage
This verifies the image signature using the public key.
cosign sign --key mykey.pub myimage
Why wrong: This signs the image, not verifies.
cosign download myimage
Why wrong: This downloads signatures, but does not verify.
cosign attest --predicate mypredicate myimage
Why wrong: This creates an attestation, not verify.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
cosign verify --key mykey.pub myimage
The 'cosign verify' command checks the signature against a public key and verifies the image.
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.
cosign verify --key mykey.pub myimage
Why this is correct
This verifies the image signature using the public key.
Related concept
Static NAT maps one inside address to one outside address.
cosign sign --key mykey.pub myimage
Why it's wrong here
This signs the image, not verifies.
cosign download myimage
Why it's wrong here
This downloads signatures, but does not verify.
cosign attest --predicate mypredicate myimage
Why it's wrong here
This creates an attestation, not verify.
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: cosign verify --key mykey.pub myimage — The 'cosign verify' command checks the signature against a public key and verifies the image.
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
This CKS practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKS exam.
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