- A
Docker is the primary CRI implementation
Why wrong: Docker is deprecated; containerd and CRI-O are primary.
- B
CRI is responsible for pulling container images
Why wrong: CRI defines the interface; the runtime handles image pulling.
- C
CRI allows Kubernetes to use different container runtimes
CRI is a plugin interface that abstracts the container runtime.
- D
CRI is an OCI specification
Why wrong: CRI is a Kubernetes API, not an OCI spec.
- E
containerd and CRI-O are CRI-compliant runtimes
Both implement the CRI.
Question 694 of 997
Container Runtime Interface (CRI)
This KCNA practice question tests your understanding of container orchestration. 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 TWO statements about the Container Runtime Interface (CRI) are correct? (Select 2)
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
✓
CRI allows Kubernetes to use different container runtimes
Option C is correct because the Container Runtime Interface (CRI) is a plugin interface that enables kubelet to use a variety of container runtimes without needing to recompile Kubernetes. It defines the API between kubelet and the container runtime, allowing runtimes like containerd and CRI-O to be swapped in seamlessly. This abstraction decouples Kubernetes from any single runtime, enabling flexibility and vendor neutrality.
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.
- ✗
Docker is the primary CRI implementation
Why it's wrong here
Docker is deprecated; containerd and CRI-O are primary.
- ✗
CRI is responsible for pulling container images
Why it's wrong here
CRI defines the interface; the runtime handles image pulling.
- ✓
CRI allows Kubernetes to use different container runtimes
Why this is correct
CRI is a plugin interface that abstracts the container runtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
CRI is an OCI specification
Why it's wrong here
CRI is a Kubernetes API, not an OCI spec.
- ✓
containerd and CRI-O are CRI-compliant runtimes
Why this is correct
Both implement the CRI.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CRI with OCI or assume Docker is still the default CRI implementation, when in fact Docker is not CRI-compliant and was removed as a built-in runtime in Kubernetes 1.24.
Detailed technical explanation
How to think about this question
Under the hood, CRI uses Protocol Buffers (protobuf) over gRPC for communication between kubelet and the runtime, with two main services: RuntimeService (for pod sandbox and container lifecycle) and ImageService (for image management). A subtle behavior is that the CRI shim (e.g., containerd's CRI plugin) translates CRI calls into OCI-compliant runc commands, meaning the runtime must implement both CRI and OCI specs. In real-world scenarios, switching from containerd to CRI-O requires only changing the kubelet's --container-runtime-endpoint flag, demonstrating the pluggability CRI provides.
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 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Container Orchestration — study guide chapter
Learn the concepts, then practise the questions
- →
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Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this KCNA question test?
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: CRI allows Kubernetes to use different container runtimes — Option C is correct because the Container Runtime Interface (CRI) is a plugin interface that enables kubelet to use a variety of container runtimes without needing to recompile Kubernetes. It defines the API between kubelet and the container runtime, allowing runtimes like containerd and CRI-O to be swapped in seamlessly. This abstraction decouples Kubernetes from any single runtime, enabling flexibility and vendor neutrality.
What should I do if I get this KCNA 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 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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