- A
The kube-proxy is not running
Why wrong: kube-proxy manages network rules, but endpoints are managed by the endpoint controller.
- B
The service's label selector does not match any pods
Endpoints are created for pods matching the selector; if none match, endpoints are empty.
- C
The service is in a different namespace
Why wrong: Service endpoints are namespace-scoped, but empty endpoints within the same namespace indicate no matching pods.
- D
The service type is LoadBalancer and no external load balancer is provisioned
Why wrong: Even for LoadBalancer type, endpoints should still show internal pod IPs.
Question 192 of 997
Why Kubernetes Service Endpoints Are Empty
This KCNA practice question tests your understanding of container orchestration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are troubleshooting a service that is not accessible from within the cluster. The service has a label selector that matches the pods. You run 'kubectl get endpoints myservice' and see that the ENDPOINTS column is empty. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 service's label selector does not match any pods
The ENDPOINTS column being empty for a service indicates that the service's label selector does not match any running pods. Kubernetes uses the label selector to dynamically populate the endpoints list; if no pods match, the service has no backends to forward traffic to, making it inaccessible from within the cluster.
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 kube-proxy is not running
Why it's wrong here
kube-proxy manages network rules, but endpoints are managed by the endpoint controller.
- ✓
The service's label selector does not match any pods
Why this is correct
Endpoints are created for pods matching the selector; if none match, endpoints are empty.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The service is in a different namespace
Why it's wrong here
Service endpoints are namespace-scoped, but empty endpoints within the same namespace indicate no matching pods.
- ✗
The service type is LoadBalancer and no external load balancer is provisioned
Why it's wrong here
Even for LoadBalancer type, endpoints should still show internal pod IPs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Kubernetes often tests the distinction between service endpoint population (which depends on label selectors) and traffic forwarding (which depends on kube-proxy), leading candidates to incorrectly blame kube-proxy when the actual issue is a selector mismatch.
Trap categories for this question
Command / output trap
Even for LoadBalancer type, endpoints should still show internal pod IPs.
Detailed technical explanation
How to think about this question
Under the hood, the Kubernetes endpoints controller watches for pods matching the service's label selector and updates the Endpoints object accordingly. If the selector is misconfigured (e.g., a typo in the label key or value), no pods are added, and the service's ClusterIP remains unreachable. In real-world scenarios, this often happens after a deployment update where labels are changed but the service selector is not updated.
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.
- →
Container Orchestration — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this KCNA question test?
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The service's label selector does not match any pods — The ENDPOINTS column being empty for a service indicates that the service's label selector does not match any running pods. Kubernetes uses the label selector to dynamically populate the endpoints list; if no pods match, the service has no backends to forward traffic to, making it inaccessible from within the cluster.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 →
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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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