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 TWO 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
✓
Ensuring the correct number of pod replicas are running
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.
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 based on resource requirements
Why it's wrong here
This is the scheduler's job.
✓
Ensuring the correct number of pod replicas are running
Why this is correct
The Replication Controller ensures the desired number of replicas.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implementing network rules for Services
Why it's wrong here
This is kube-proxy's job.
✓
Monitoring node health and responding to node failures
Why this is correct
The Node Controller, part of the controller manager, handles node health.
Related concept
Read the scenario before looking for a memorised answer.
✗
Storing the cluster state
Why it's wrong here
This is etcd's job.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the kube-controller-manager's role in node health monitoring with the kube-scheduler's role in pod placement, or they mistakenly think the controller-manager handles network rules, which is actually done by kube-proxy.
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 Endpoint Controller. The Node Controller monitors node health via the Node Lifecycle Controller, which checks the node's status every --node-monitor-period (default 5 seconds) and reacts to NodeReady condition failures after --node-monitor-grace-period (default 40 seconds). In a real-world scenario, if a node fails, the Node Controller will taint the node and evict pods after the configured pod-eviction-timeout (default 5 minutes).
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: Ensuring the correct number of pod replicas are running — 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.
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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