This KCNA practice question tests your understanding of kubernetes fundamentals. 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.
You are asked to schedule a pod on a node that has SSD storage. Which mechanism should you use to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a nodeSelector with a label matching the node, e.g., disktype: ssd
Option C is correct because nodeSelector is the built-in Kubernetes mechanism for constraining a pod to nodes with specific labels. By labeling a node with disktype=ssd and adding that same label selector to the pod spec, the scheduler will only place the pod on nodes that have that label, ensuring it lands on SSD-equipped nodes.
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.
✗
Use a resource request for SSD storage capacity
Why it's wrong here
Resource requests are for CPU/memory, not for node attributes like disk type.
✗
Set an annotation on the pod specifying the disk type
Why it's wrong here
Annotations are metadata and do not affect scheduling decisions.
✓
Add a nodeSelector with a label matching the node, e.g., disktype: ssd
Why this is correct
nodeSelector ensures the pod is scheduled on nodes with the matching label.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a toleration for a taint on SSD nodes
Why it's wrong here
Tolerations allow pods to be scheduled on tainted nodes, but they don't force scheduling; they only permit it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse tolerations (which only allow scheduling on tainted nodes) with node selectors (which actively target nodes), leading them to pick D instead of C.
Detailed technical explanation
How to think about this question
Under the hood, nodeSelector is implemented as a simple label match in the scheduler's predicate phase; the pod will be rejected if no node matches the label. For more complex constraints, node affinity (a more expressive feature) can be used with matchExpressions, but nodeSelector remains the simplest and most direct method for exact label matching. In real-world scenarios, operators often combine nodeSelector with taints and tolerations to both attract pods to SSD nodes and repel other workloads.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a nodeSelector with a label matching the node, e.g., disktype: ssd — Option C is correct because nodeSelector is the built-in Kubernetes mechanism for constraining a pod to nodes with specific labels. By labeling a node with disktype=ssd and adding that same label selector to the pod spec, the scheduler will only place the pod on nodes that have that label, ensuring it lands on SSD-equipped nodes.
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.
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Question Discussion
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