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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
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.
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Question Discussion
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