Question 993 of 997

Kubernetes Fundamentals →mediumMultiple ChoiceObjective-mapped

kube-proxy Load Balancing for ClusterIP

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.

A Service of type ClusterIP is created to expose a set of pods. How does the Service achieve load balancing to the pods?

A
The API server routes traffic directly to the pods
Why wrong: The API server is not involved in data plane traffic.
B
The kube-proxy component on each node sets up network rules to forward traffic to the pods
kube-proxy handles the implementation of ClusterIP Services.
C
The kubelet configures the container runtime to route traffic
Why wrong: kubelet does not handle service networking.
D
Using a cloud load balancer
Why wrong: That would be a LoadBalancer type Service, not ClusterIP.

Full breakdown with real-world context →

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

✓

The kube-proxy component on each node sets up network rules to forward traffic to the pods

Option B is correct because kube-proxy on each node implements load balancing for ClusterIP Services by creating iptables or IPVS rules that distribute traffic from the Service's virtual IP to the backend pods. These rules use a random or round-robin selection (depending on the mode) to forward packets to healthy pods, ensuring no single pod is overwhelmed.

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.

✗
The API server routes traffic directly to the pods
Why it's wrong here
The API server is not involved in data plane traffic.
✓
The kube-proxy component on each node sets up network rules to forward traffic to the pods
Why this is correct
kube-proxy handles the implementation of ClusterIP Services.
Related concept
Read the scenario before looking for a memorised answer.
✗
The kubelet configures the container runtime to route traffic
Why it's wrong here
kubelet does not handle service networking.
✗
Using a cloud load balancer
Why it's wrong here
That would be a LoadBalancer type Service, not ClusterIP.

Common exam traps

Common exam trap: answer the scenario, not the keyword

A common trap is confusing the control-plane role of the API server with the data-plane role of kube-proxy. The API server does not handle data-plane traffic for Services.

Detailed technical explanation

How to think about this question

Under the hood, kube-proxy watches the API server for Service and EndpointSlice changes, then updates iptables chains (or IPVS virtual servers) to map the ClusterIP:port to a set of pod IPs. In iptables mode, each packet traverses a chain that uses statistical probability to select a backend, while IPVS mode uses a kernel-level hash table for more efficient load balancing. A subtle behavior is that kube-proxy does not perform health checks on pods by default; it relies on the readiness probes reported in EndpointSlices to exclude unready pods from the load-balancing set.

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.

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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: The kube-proxy component on each node sets up network rules to forward traffic to the pods — Option B is correct because kube-proxy on each node implements load balancing for ClusterIP Services by creating iptables or IPVS rules that distribute traffic from the Service's virtual IP to the backend pods. These rules use a random or round-robin selection (depending on the mode) to forward packets to healthy pods, ensuring no single pod is overwhelmed.

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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