This KCNA practice question tests your understanding of container orchestration. 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.
Which Open Container Initiative (OCI) specification defines the format of container images?
Runtime Spec
Why wrong: Runtime Spec defines how to run containers, not the image format.
Image Spec
OCI Image Spec standardizes container image format.
Container Runtime Interface (CRI)
Why wrong: CRI is a Kubernetes interface for container runtimes, not an OCI spec.
Dockerfile specification
Why wrong: Dockerfile is a build instruction file, not an OCI specification.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Image Spec
The OCI Image Spec defines the format and content of container images, including the manifest, configuration, and layers. This ensures that any OCI-compliant runtime can run images built by any OCI-compliant tool, enabling interoperability across different container platforms.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Runtime Spec
Why it's wrong here
Runtime Spec defines how to run containers, not the image format.
Image Spec
Why this is correct
OCI Image Spec standardizes container image format.
Related concept
Read the scenario before looking for a memorised answer.
Container Runtime Interface (CRI)
Why it's wrong here
CRI is a Kubernetes interface for container runtimes, not an OCI spec.
Dockerfile specification
Why it's wrong here
Dockerfile is a build instruction file, not an OCI specification.
Common exam traps
The trap here is confusing the OCI Runtime Spec (which deals with running containers) with the OCI Image Spec (which deals with packaging images), or mistaking the Kubernetes CRI plugin interface for an OCI standard.
Detailed technical explanation
Under the hood, the OCI Image Spec defines a JSON manifest that references a config file and a list of layer digests (SHA256 hashes). Each layer is a tar archive compressed with gzip, and the config file contains metadata like environment variables, entrypoint, and history. This separation allows image signing, content-addressable storage, and efficient layer caching in registries like Docker Hub or Harbor.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the KCNA 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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
The correct answer is: Image Spec — The OCI Image Spec defines the format and content of container images, including the manifest, configuration, and layers. This ensures that any OCI-compliant runtime can run images built by any OCI-compliant tool, enabling interoperability across different container platforms.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This KCNA 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 KCNA exam.
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