- A
Assigning Pods to Nodes
Why wrong: This is the job of the kube-scheduler.
- B
Creating Endpoints objects for Services
The Endpoints Controller populates Endpoints objects based on Service selectors.
- C
Monitoring Node health and reacting to Node failures
The Node Controller monitors nodes and marks them as unhealthy.
- D
Ensuring the correct number of Pod replicas are running
ReplicationController and ReplicaSet controllers ensure the desired number of pods.
- E
Serving the Kubernetes API
Why wrong: This is the role of the kube-apiserver.
Question 515 of 997
Kube-controller-manager Responsibilities
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 THREE of the following are responsibilities of the kube-controller-manager?
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
✓
Creating Endpoints objects for Services
Option B is correct because the kube-controller-manager includes the EndpointSlice controller (or the legacy Endpoints controller), which is responsible for creating and updating Endpoints (and EndpointSlice) objects to reflect the IP addresses and ports of Pods that match a Service's label selector. This ensures that the Service's DNS or iptables rules point to healthy Pods.
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.
- ✗
Assigning Pods to Nodes
Why it's wrong here
This is the job of the kube-scheduler.
- ✓
Creating Endpoints objects for Services
Why this is correct
The Endpoints Controller populates Endpoints objects based on Service selectors.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Monitoring Node health and reacting to Node failures
Why this is correct
The Node Controller monitors nodes and marks them as unhealthy.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Ensuring the correct number of Pod replicas are running
Why this is correct
ReplicationController and ReplicaSet controllers ensure the desired number of pods.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Serving the Kubernetes API
Why it's wrong here
This is the role of the kube-apiserver.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the kube-controller-manager's role in 'managing controllers' with the scheduler's role in 'assigning Pods to nodes', or they mistakenly think the controller-manager serves the API because it interacts with the API server.
Detailed technical explanation
How to think about this question
The kube-controller-manager bundles multiple controllers into a single binary, including the Node controller, Replication controller, and EndpointSlice controller. The Node controller checks node status via the NodeLifecycleController, which monitors heartbeats (NodeLease or status updates) and taints nodes as unreachable after a configurable `node-monitor-grace-period` (default 40 seconds). In large clusters, the EndpointSlice controller splits endpoints into slices of up to 100 endpoints to reduce API server load and improve scalability.
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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Targeted practice on this topic area only
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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: Creating Endpoints objects for Services — Option B is correct because the kube-controller-manager includes the EndpointSlice controller (or the legacy Endpoints controller), which is responsible for creating and updating Endpoints (and EndpointSlice) objects to reflect the IP addresses and ports of Pods that match a Service's label selector. This ensures that the Service's DNS or iptables rules point to healthy Pods.
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
3 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 TWO of the following are responsibilities of the kube-controller-manager? (Select 2)
easy- ✓ A.Ensuring the desired number of pod replicas are running
- B.Implementing service networking rules
- C.Storing the cluster state
- ✓ D.Detecting node failures and reacting
- E.Scheduling pods onto nodes
Why A: The kube-controller-manager is responsible for running controller processes that regulate the state of the cluster. Option A is correct because the ReplicaSet controller, which runs inside the kube-controller-manager, continuously monitors the number of running pods and ensures it matches the desired replica count defined in the ReplicaSet or Deployment object. If a pod fails or is deleted, the controller creates a replacement to maintain the desired state.
Variation 2. Which TWO of the following are responsibilities of the kube-controller-manager?
hard- A.Assigning pods to nodes
- B.Storing cluster state
- ✓ C.Managing endpoint objects for Services
- ✓ D.Monitoring node health
- E.Serving the Kubernetes API
Why C: The kube-controller-manager runs controllers that handle routine tasks. The Node controller watches the health of nodes. The Endpoint controller (now EndpointSlice controller) manages endpoints for Services. Assigning pods to nodes is done by the scheduler. Storing cluster state is done by etcd. Serving the Kubernetes API is done by kube-apiserver.
Variation 3. Which TWO of the following are responsibilities of the kube-controller-manager?
medium- A.Assigning pods to nodes based on resource requirements
- ✓ B.Ensuring the correct number of pod replicas are running
- C.Implementing network rules for Services
- ✓ D.Monitoring node health and responding to node failures
- E.Storing the cluster state
Why B: The kube-controller-manager runs controller processes that regulate the state of the cluster. The ReplicaSet controller, which runs inside the kube-controller-manager, is responsible for ensuring that the desired number of pod replicas are running at all times, creating or deleting pods as necessary to match the specified replica count.
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Last reviewed: Jun 24, 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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