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.
You have a Pod that is running but not receiving traffic. You suspect the associated Service's selector does not match the Pod labels. Which kubectl command would you use to check the Service's selector?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl describe service <service-name>
Option B is correct because `kubectl describe service <service-name>` displays the service's selector field under the 'Selector' section, allowing you to directly compare it with the Pod's labels. This is the most straightforward way to verify if the selector matches the Pod labels, which is essential for traffic routing.
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.
✗
kubectl get endpoints <service-name>
Why it's wrong here
Endpoints show the current IPs backing the Service, but not the selector.
✓
kubectl describe service <service-name>
Why this is correct
This shows detailed information including the selector field.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl get service <service-name> -o yaml
Why it's wrong here
This also shows the selector, but describe is more concise and typical for quick inspection.
✗
kubectl logs <pod-name>
Why it's wrong here
Logs show application output, not Service configuration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between checking the selector definition versus checking the resulting endpoints, so candidates may mistakenly choose `kubectl get endpoints` because it shows the current routing status, but it does not reveal the selector itself.
Trap categories for this question
Command / output trap
Endpoints show the current IPs backing the Service, but not the selector.
Detailed technical explanation
How to think about this question
Under the hood, a Kubernetes Service uses label selectors to dynamically discover Pods; the selector is a set of key-value pairs that must match the labels on the Pods. The `kubectl describe` command queries the Kubernetes API and formats the output to show the selector clearly, while `kubectl get endpoints` shows the actual IPs of matched Pods, which can be empty if the selector doesn't match. In a real-world scenario, a common issue is a typo in the selector or Pod labels, and `kubectl describe service` is the first troubleshooting step to identify the mismatch.
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: kubectl describe service <service-name> — Option B is correct because `kubectl describe service <service-name>` displays the service's selector field under the 'Selector' section, allowing you to directly compare it with the Pod's labels. This is the most straightforward way to verify if the selector matches the Pod labels, which is essential for traffic routing.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.