KCNA Kubernetes Fundamentals Practice Question
Which TWO of the following are valid ways to assign a pod to a specific node?
⚠ Common exam trap
CNCF often tests the distinction between mechanisms that *constrain* scheduling (like nodeSelector and nodeAffinity) versus mechanisms that *permit* scheduling (like tolerations), and candidates mistakenly think tolerations can force a pod to a specific node when they only allow it to be scheduled on tainted nodes.
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
✓
nodeSelector
`nodeSelector` is a simple, built-in field in the Pod spec that matches the pod to nodes with specific labels. When you add a `nodeSelector` with a key-value pair, the scheduler only places the pod on nodes that have that exact label. This is the most straightforward way to constrain a pod to a subset of nodes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
nodeSelector
Why this is correct
Node selector uses labels to match nodes.
- ✗
affinity: nodeAntiAffinity
Why it's wrong here
Anti-affinity prevents scheduling on nodes, does not assign.
- ✗
tolerations
Why it's wrong here
Tolerations allow scheduling on tainted nodes but do not assign to a specific node.
- ✓
nodeName
Why this is correct
nodeName directly specifies the node.
- ✗
podSelector
Why it's wrong here
PodSelector is used for network policies or pod affinity, not node assignment.
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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.