KCNA Container Orchestration Practice Question
Which THREE are valid container runtimes that implement the Kubernetes CRI? (Choose three.)
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
✓
Docker (via dockershim, deprecated)
containerd, CRI-O, and Docker (via dockershim, deprecated) implement CRI. rkt is discontinued and not CRI-compliant; runc is a low-level runtime, not a CRI implementation.
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 (via dockershim, deprecated)
Why this is correct
Docker used dockershim to implement CRI, now deprecated.
- ✓
containerd
Why this is correct
containerd is a CRI-compliant runtime.
- ✗
runc
Why it's wrong here
runc is a low-level OCI runtime, not a CRI implementation.
- ✓
CRI-O
Why this is correct
CRI-O is a lightweight CRI runtime.
- ✗
rkt
Why it's wrong here
rkt is discontinued and not CRI-compliant.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.