- A
kubelet
Why wrong: The kubelet runs on worker nodes and ensures containers are running, but does not manage replica counts.
- B
kube-scheduler
Why wrong: The scheduler assigns pods to nodes but does not manage replicas.
- C
kube-controller-manager
The controller manager runs controllers that handle replication, endpoints, etc.
- D
kube-apiserver
Why wrong: The API server is the entry point for API requests, not for maintaining pod replicas.
Question 135 of 997
Kube-Controller-Manager: Maintaining Pod Replica Counts
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.
Which Kubernetes component is responsible for ensuring that the desired number of pod replicas is running in the cluster?
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
✓
kube-controller-manager
The kube-controller-manager runs controller processes, including the Replication Controller, which is responsible for ensuring that the desired number of pod replicas are running at all times. It watches the current state via the API server and takes corrective actions (e.g., creating or deleting pods) to match the desired replica count defined in the ReplicaSet or Deployment.
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.
- ✗
kubelet
Why it's wrong here
The kubelet runs on worker nodes and ensures containers are running, but does not manage replica counts.
- ✗
kube-scheduler
Why it's wrong here
The scheduler assigns pods to nodes but does not manage replicas.
- ✓
kube-controller-manager
Why this is correct
The controller manager runs controllers that handle replication, endpoints, etc.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
kube-apiserver
Why it's wrong here
The API server is the entry point for API requests, not for maintaining pod replicas.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the kube-scheduler's role of placing pods with the controller-manager's role of maintaining the desired count, leading them to select the scheduler when the question is about replica management.
Detailed technical explanation
How to think about this question
Under the hood, the ReplicationController (or the newer ReplicaSet) uses a control loop that continuously compares the current number of pods (via label selectors) against the desired replicas field. If a pod fails or is deleted, the controller creates a replacement pod using the pod template. In real-world scenarios, this ensures self-healing: if a node goes down, the controller spins up replacement pods on healthy nodes, maintaining application availability.
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.
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.
- →
Kubernetes Fundamentals — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this KCNA question test?
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: kube-controller-manager — The kube-controller-manager runs controller processes, including the Replication Controller, which is responsible for ensuring that the desired number of pod replicas are running at all times. It watches the current state via the API server and takes corrective actions (e.g., creating or deleting pods) to match the desired replica count defined in the ReplicaSet or Deployment.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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.
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