- A
The node has insufficient memory
Why wrong: Insufficient memory would cause OOM, not a network error.
- B
The pod is trying to mount a hostPath volume
Why wrong: HostPath mounts are supported by Kata, though with some restrictions.
- C
The CNI plugin is not configured correctly for the kata RuntimeClass
Kata requires specific CNI configuration; misconfiguration leads to network not ready.
- D
The pod's securityContext sets runAsNonRoot: true
Why wrong: runAsNonRoot does not affect network readiness.
Question 332 of 997
Troubleshooting Kata Containers: CNI Plugin Not Configured for kata RuntimeClass
This CKS practice question tests your understanding of minimize microservice vulnerabilities. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A pod fails to start with the error 'Container runtime network not ready', and the node uses Kata Containers (RuntimeClass: kata). What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
The CNI plugin is not configured correctly for the kata RuntimeClass
Kata Containers use lightweight VMs for pod isolation, which require a separate CNI plugin (e.g., flannel, calico) to be configured specifically for the kata RuntimeClass. The error 'Container runtime network not ready' indicates that the CNI plugin is either missing, misconfigured, or not compatible with the kata runtime, preventing the pod's network namespace from being set up.
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.
- ✗
The node has insufficient memory
Why it's wrong here
Insufficient memory would cause OOM, not a network error.
- ✗
The pod is trying to mount a hostPath volume
Why it's wrong here
HostPath mounts are supported by Kata, though with some restrictions.
- ✓
The CNI plugin is not configured correctly for the kata RuntimeClass
Why this is correct
Kata requires specific CNI configuration; misconfiguration leads to network not ready.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The pod's securityContext sets runAsNonRoot: true
Why it's wrong here
runAsNonRoot does not affect network readiness.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often overlook the need for RuntimeClass-specific CNI configuration when using Kata Containers, assuming that the network error is always due to a cluster-wide CNI issue.
Detailed technical explanation
How to think about this question
Kata Containers rely on a VM-based sandbox that uses a separate network namespace managed by the CNI plugin via the containerd-shim-kata-v2 process. The CNI plugin must be configured with a 'runtimeClasses' section in its configuration file (e.g., /etc/cni/net.d/*.conf) to associate the kata RuntimeClass with the correct network plugin, otherwise the runtime cannot bring up the virtual network interface. In real-world scenarios, this often occurs when the cluster uses a default CNI plugin that does not support VM-based runtimes, or when the kata RuntimeClass is not properly registered in the CNI configuration.
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 CKS 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.
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FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CNI plugin is not configured correctly for the kata RuntimeClass — Kata Containers use lightweight VMs for pod isolation, which require a separate CNI plugin (e.g., flannel, calico) to be configured specifically for the kata RuntimeClass. The error 'Container runtime network not ready' indicates that the CNI plugin is either missing, misconfigured, or not compatible with the kata runtime, preventing the pod's network namespace from being set up.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 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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