- A
It ensures the desired number of pods are running
Why wrong: That is the job of the ReplicaSet controller, part of kube-controller-manager.
- B
It runs the container runtime
Why wrong: Container runtime (e.g., containerd) runs containers, not kube-proxy.
- C
It reports node status to the control plane
Why wrong: kubelet reports node status; kube-proxy focuses on networking.
- D
It implements part of the Kubernetes Service concept by managing network rules
kube-proxy handles IP tables/IPVS rules for service load balancing.
Question 941 of 997
Kube-Proxy — Network Rules and Service Routing
This KCNA practice question tests your understanding of kubernetes fundamentals. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
What is the function of kube-proxy on a worker node?
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
✓
It implements part of the Kubernetes Service concept by managing network rules
kube-proxy runs on each worker node and is responsible for implementing the Kubernetes Service abstraction by managing network rules (e.g., iptables, IPVS, or userspace mode). It watches the API server for Service and EndpointSlice changes and configures local packet filtering or forwarding rules to route traffic to the correct backend pods, enabling load balancing and service discovery.
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.
- ✗
It ensures the desired number of pods are running
Why it's wrong here
That is the job of the ReplicaSet controller, part of kube-controller-manager.
- ✗
It runs the container runtime
Why it's wrong here
Container runtime (e.g., containerd) runs containers, not kube-proxy.
- ✗
It reports node status to the control plane
Why it's wrong here
kubelet reports node status; kube-proxy focuses on networking.
- ✓
It implements part of the Kubernetes Service concept by managing network rules
Why this is correct
kube-proxy handles IP tables/IPVS rules for service load balancing.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common misconception is that kube-proxy handles pod lifecycle or node health reporting, when in fact those are kubelet responsibilities. Candidates often confuse the 'proxy' name with general node management.
Detailed technical explanation
How to think about this question
Under the hood, kube-proxy in iptables mode creates DNAT rules for each Service, rewriting the destination IP of packets to a randomly selected pod IP from the EndpointSlice. In IPVS mode, it uses the Linux kernel's IP Virtual Server to provide more efficient load balancing with scheduling algorithms like round-robin or least connections. A real-world scenario where this matters is in large clusters with thousands of Services, where iptables rules can become slow to update, prompting operators to switch to IPVS or eBPF-based solutions like Cilium.
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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Kubernetes and Cloud Native Associate KCNA study guide
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KCNA practice test guide
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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: It implements part of the Kubernetes Service concept by managing network rules — kube-proxy runs on each worker node and is responsible for implementing the Kubernetes Service abstraction by managing network rules (e.g., iptables, IPVS, or userspace mode). It watches the API server for Service and EndpointSlice changes and configures local packet filtering or forwarding rules to route traffic to the correct backend pods, enabling load balancing and service discovery.
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
1 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. What is the purpose of kube-proxy on a worker node?
medium- A.To run the container runtime
- B.To store cluster configuration data
- ✓ C.To implement network rules and handle service traffic routing
- D.To monitor pod health and restart unhealthy containers
Why C: Option C is correct because kube-proxy is the component responsible for implementing network rules on each worker node, enabling service abstraction by managing IP tables or IPVS rules to route traffic to the appropriate pods. It handles service discovery and load balancing for ClusterIP, NodePort, and LoadBalancer service types, ensuring that traffic destined for a service is correctly forwarded to healthy pod endpoints.
Keep practising
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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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