- A
kube-apiserver
The API server is the only component that directly reads and writes to etcd.
- B
kube-controller-manager
Why wrong: Controllers communicate via the API server.
- C
kube-scheduler
Why wrong: The scheduler communicates with the API server, not directly with etcd.
- D
kubelet
Why wrong: The kubelet runs on worker nodes and communicates with the API server, not directly with etcd.
Question 569 of 997
Kube-APIServer — Only Component Accessing etcd Directly
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 the only one that directly interacts with etcd?
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-apiserver
The kube-apiserver is the only component of the Kubernetes control plane that directly interacts with etcd. It acts as the front-end for the control plane, exposing the Kubernetes API, and all reads and writes to the cluster's state stored in etcd must go through the API server. Other components like the kube-controller-manager and kube-scheduler only communicate with etcd indirectly via the kube-apiserver, never directly.
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-apiserver
Why this is correct
The API server is the only component that directly reads and writes to etcd.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
kube-controller-manager
Why it's wrong here
Controllers communicate via the API server.
- ✗
kube-scheduler
Why it's wrong here
The scheduler communicates with the API server, not directly with etcd.
- ✗
kubelet
Why it's wrong here
The kubelet runs on worker nodes and communicates with the API server, not directly with etcd.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the kube-controller-manager or kube-scheduler directly access etcd because they manage cluster state, but in reality they only interact with etcd indirectly through the kube-apiserver.
Detailed technical explanation
How to think about this question
Under the hood, etcd uses the Raft consensus algorithm to maintain a consistent, distributed key-value store, and the kube-apiserver is the sole client authorized to perform watch and write operations on etcd via gRPC. This architectural isolation ensures that all state changes are serialized through the API server's admission controllers and validation logic, preventing corruption from concurrent access. In a real-world scenario, if the kube-apiserver is unavailable, no other control plane component can read or write cluster state, leading to a complete loss of cluster management capability until the API server is restored.
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-apiserver — The kube-apiserver is the only component of the Kubernetes control plane that directly interacts with etcd. It acts as the front-end for the control plane, exposing the Kubernetes API, and all reads and writes to the cluster's state stored in etcd must go through the API server. Other components like the kube-controller-manager and kube-scheduler only communicate with etcd indirectly via the kube-apiserver, never directly.
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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