- A
kube-scheduler
Why wrong: The scheduler assigns pods to nodes, not persistent storage.
- B
kube-controller-manager
Why wrong: Controller manager runs controllers but does not persist state.
- C
etcd
etcd stores all cluster data.
- D
kube-apiserver
Why wrong: The API server serves the API but does not persist state itself.
Question 848 of 997
Cluster State Persistence (etcd) — Kubernetes and Cloud Native Associate Explained
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 component of the control plane is responsible for persisting the entire cluster state?
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
✓
etcd
etcd is the distributed key-value store that serves as the single source of truth for the entire cluster state, including all objects (Pods, Services, ConfigMaps, etc.), their specifications, and their current status. It is the only component that persists data to disk, ensuring that the cluster can recover its full state after a restart or failure. The kube-apiserver reads from and writes to etcd, but etcd itself is the storage backend.
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-scheduler
Why it's wrong here
The scheduler assigns pods to nodes, not persistent storage.
- ✗
kube-controller-manager
Why it's wrong here
Controller manager runs controllers but does not persist state.
- ✓
etcd
Why this is correct
etcd stores all cluster data.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
kube-apiserver
Why it's wrong here
The API server serves the API but does not persist state itself.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The KCNA exam often tests the misconception that kube-apiserver is the persistence layer because it is the central entry point, but the trap is that the API server is stateless and only acts as a gateway to etcd, which is the actual durable store.
Detailed technical explanation
How to think about this question
etcd uses the Raft consensus algorithm to maintain consistency across multiple replicas, ensuring that even if a leader fails, a new leader is elected and the cluster state remains intact. It stores data as key-value pairs under a hierarchical directory structure (e.g., /registry/pods/default/my-pod), and all watch operations from controllers and schedulers rely on etcd's event-driven notifications to react to state changes in near real-time. In production, etcd should be deployed on dedicated nodes or with SSD storage to minimize latency, as every API write operation must be committed to a quorum of etcd members.
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
- →
Kubernetes Fundamentals practice questions
Targeted practice on this topic area only
- →
All KCNA questions
997 questions across all exam domains
- →
Kubernetes and Cloud Native Associate KCNA study guide
Full concept coverage aligned to exam objectives
- →
KCNA practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related KCNA practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Kubernetes Fundamentals practice questions
Practise KCNA questions linked to Kubernetes Fundamentals.
Container Orchestration practice questions
Practise KCNA questions linked to Container Orchestration.
Cloud Native Architecture practice questions
Practise KCNA questions linked to Cloud Native Architecture.
Cloud Native Observability practice questions
Practise KCNA questions linked to Cloud Native Observability.
Cloud Native Application Delivery practice questions
Practise KCNA questions linked to Cloud Native Application Delivery.
KCNA fundamentals practice questions
Practise KCNA questions linked to KCNA fundamentals.
KCNA scenario practice questions
Practise KCNA questions linked to KCNA scenario.
KCNA troubleshooting practice questions
Practise KCNA questions linked to KCNA troubleshooting.
Practice this exam
Start a free KCNA practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: etcd — etcd is the distributed key-value store that serves as the single source of truth for the entire cluster state, including all objects (Pods, Services, ConfigMaps, etc.), their specifications, and their current status. It is the only component that persists data to disk, ensuring that the cluster can recover its full state after a restart or failure. The kube-apiserver reads from and writes to etcd, but etcd itself is the storage backend.
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 →
Same concept, more angles
2 more ways this is tested on KCNA
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which control plane component is responsible for persisting the entire cluster state?
medium- A.kube-controller-manager
- ✓ B.etcd
- C.kube-apiserver
- D.kube-scheduler
Why B: etcd is the distributed key-value store that serves as the single source of truth for the entire cluster state, including all objects (Pods, Services, ConfigMaps, etc.) and their desired and current status. The kube-apiserver is the only component that directly communicates with etcd, ensuring that all state changes are persisted durably and consistently. Without etcd, the cluster would have no record of its configuration or running workloads.
Variation 2. Which component of the Kubernetes control plane is responsible for persisting the cluster state?
easy- A.kube-scheduler
- B.kube-controller-manager
- ✓ C.etcd
- D.kube-apiserver
Why C: etcd is the distributed key-value store that acts as the single source of truth for the entire Kubernetes cluster. It stores all cluster state data, including configuration, secrets, and the desired state of every object, ensuring consistency and durability. The kube-apiserver is the only component that directly interacts with etcd, enforcing a strict serialization of writes to prevent corruption.
Keep practising
More KCNA practice questions
- Which CNCF project provides a graduated service mesh implementation that includes features like traffic management, secu…
- A pod in the 'production' namespace is in a CrashLoopBackOff state. The pod has been running successfully for several da…
- You need to ensure that a pod runs on a node with SSD storage. How can you achieve this?
- Match each Kubernetes resource to its primary purpose.
- Match each Kubernetes security concept to its definition.
- Which three of the following are valid methods to create or update resources in Kubernetes? (Choose three.)
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.