This CKS practice question tests your understanding of cluster setup and hardening. 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.
A cluster has been configured with the NodeRestriction admission plugin. A developer tries to create a pod that uses a hostPath volume pointing to /var/log. The pod's nodeSelector is set to 'kubernetes.io/hostname: worker-1'. Which statement is true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pod will be created because NodeRestriction does not restrict hostPath volumes.
The NodeRestriction admission plugin limits the node labels that a kubelet can set and restricts pods from modifying their node affinity to gain access to node-specific resources. However, it does not restrict the use of hostPath volumes. Therefore, a pod with a hostPath volume pointing to /var/log and a nodeSelector for 'worker-1' will be created, as long as the nodeSelector matches an existing node label and the hostPath volume is otherwise permitted by the PodSecurityPolicy or other security contexts.
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 pod will be created only if the node label matches the nodeSelector; the hostPath volume is irrelevant.
Why it's wrong here
NodeSelector is for scheduling, not for hostPath restrictions.
✗
The pod will be rejected because hostPath volumes are not allowed by NodeRestriction.
Why it's wrong here
NodeRestriction does not restrict hostPath volumes.
✓
The pod will be created because NodeRestriction does not restrict hostPath volumes.
Why this is correct
NodeRestriction only restricts node self-updates, not hostPath.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pod will be rejected because the nodeSelector conflicts with the NodeRestriction plugin.
Why it's wrong here
No conflict exists; NodeRestriction does not affect nodeSelector.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse NodeRestriction with other admission plugins like PodSecurityPolicy or think it enforces broad security restrictions, when in fact it only targets node label and kubelet certificate behavior.
Detailed technical explanation
How to think about this question
The NodeRestriction plugin works by limiting the labels a kubelet can set on its node object (preventing impersonation of other nodes) and by preventing pods from modifying their spec.nodeName to bypass scheduling. It does not inspect or block hostPath volumes, which are controlled by other admission controllers like PodSecurityPolicy or custom OPA rules. In a real-world scenario, a cluster with NodeRestriction enabled might still allow hostPath volumes unless additional policies (e.g., PodSecurityPolicy with 'allowedHostPaths') are configured.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Cluster Setup and Hardening — This question tests Cluster Setup and Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The pod will be created because NodeRestriction does not restrict hostPath volumes. — The NodeRestriction admission plugin limits the node labels that a kubelet can set and restricts pods from modifying their node affinity to gain access to node-specific resources. However, it does not restrict the use of hostPath volumes. Therefore, a pod with a hostPath volume pointing to /var/log and a nodeSelector for 'worker-1' will be created, as long as the nodeSelector matches an existing node label and the hostPath volume is otherwise permitted by the PodSecurityPolicy or other security contexts.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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