- A
Kube-proxy
Why wrong: Kube-proxy handles network proxying and load balancing for services, not pod lifecycle.
- B
Kubelet
Why wrong: Kubelet runs on each node and ensures containers are running in a pod, but it does not manage replica counts.
- C
Controller Manager
Why wrong: Controller Manager runs controllers, but the specific controller for replica management is ReplicaSet.
- D
ReplicaSet
ReplicaSet ensures a stable set of replica pods running at any given time.
Question 169 of 997
ReplicaSet: Ensuring Desired Replicas
This KCNA practice question tests your understanding of container orchestration. 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 component in Kubernetes is responsible for managing the lifecycle of pods and ensuring the desired number of replicas are running?
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
✓
ReplicaSet
The ReplicaSet (option D) is the Kubernetes controller that ensures a specified number of pod replicas are running at any given time. It manages pod lifecycle by creating or deleting pods to match the desired replica count defined in its spec, and it is the fundamental building block for higher-level controllers like Deployments.
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.
- ✗
Kube-proxy
Why it's wrong here
Kube-proxy handles network proxying and load balancing for services, not pod lifecycle.
- ✗
Kubelet
Why it's wrong here
Kubelet runs on each node and ensures containers are running in a pod, but it does not manage replica counts.
- ✗
Controller Manager
Why it's wrong here
Controller Manager runs controllers, but the specific controller for replica management is ReplicaSet.
- ✓
ReplicaSet
Why this is correct
ReplicaSet ensures a stable set of replica pods running at any given time.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
In Kubernetes certification exams, candidates often confuse the Controller Manager (which hosts multiple controllers) with the specific controller (e.g., ReplicaSet) that performs the actual work, leading to selecting the broader component instead of the precise one.
Detailed technical explanation
How to think about this question
Under the hood, the ReplicaSet controller watches the Kubernetes API server for changes to ReplicaSet objects and uses a label selector to identify matching pods. It continuously reconciles the current pod count with the desired replicas by creating or deleting pods via the API, and it relies on the etcd store for state persistence. In real-world scenarios, a ReplicaSet is rarely used directly; instead, a Deployment manages ReplicaSets to enable rolling updates and rollbacks, with the ReplicaSet handling the actual replica count enforcement.
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.
- →
Container Orchestration — study guide chapter
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FAQ
Questions learners often ask
What does this KCNA question test?
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ReplicaSet — The ReplicaSet (option D) is the Kubernetes controller that ensures a specified number of pod replicas are running at any given time. It manages pod lifecycle by creating or deleting pods to match the desired replica count defined in its spec, and it is the fundamental building block for higher-level controllers like Deployments.
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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