- A
A Service provides a stable IP address and DNS name for a set of Pods.
Services provide stable endpoints that decouple clients from individual Pod IPs.
- B
Services use label selectors to identify the target Pods.
Services use label selectors to determine which Pods receive traffic.
- C
A Service of type LoadBalancer can be used to expose an application externally.
LoadBalancer type provisions an external load balancer to expose the service.
- D
A Service can only route traffic to Pods within the same namespace.
Why wrong: Services can route to Pods in any namespace if the selector matches (though cross-namespace routing is typically not recommended, it is possible by specifying the namespace in the selector? Actually, Services are namespaced and can only select Pods in the same namespace. So this option is false because selector is namespace-scoped.)
- E
The default Service type is NodePort.
Why wrong: The default Service type is ClusterIP, not NodePort.
KCNA Kubernetes Fundamentals Practice Question
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 THREE statements about Kubernetes Services are correct?
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
A Service provides a stable IP address and DNS name for a set of Pods.
A is correct because a Kubernetes Service provides a stable virtual IP address and a DNS name (via CoreDNS) that remains constant even as the underlying Pods are created, destroyed, or scaled. This decouples clients from the ephemeral nature of Pod IPs, ensuring reliable connectivity.
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.
- ✓
A Service provides a stable IP address and DNS name for a set of Pods.
Why this is correct
Services provide stable endpoints that decouple clients from individual Pod IPs.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Services use label selectors to identify the target Pods.
Why this is correct
Services use label selectors to determine which Pods receive traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
A Service of type LoadBalancer can be used to expose an application externally.
Why this is correct
LoadBalancer type provisions an external load balancer to expose the service.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A Service can only route traffic to Pods within the same namespace.
Why it's wrong here
Services can route to Pods in any namespace if the selector matches (though cross-namespace routing is typically not recommended, it is possible by specifying the namespace in the selector? Actually, Services are namespaced and can only select Pods in the same namespace. So this option is false because selector is namespace-scoped.)
- ✗
The default Service type is NodePort.
Why it's wrong here
The default Service type is ClusterIP, not NodePort.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that Services are namespace-scoped for routing, when in fact only the Service object itself is namespaced, but it can target Pods across namespaces if the selector matches.
Detailed technical explanation
How to think about this question
Under the hood, a Service's stable IP is assigned from the cluster's service CIDR range and is managed by the kube-proxy component, which programs iptables or IPVS rules to load-balance traffic to the selected Pods. A subtle behavior is that headless Services (clusterIP: None) bypass this virtual IP and return the actual Pod IPs via DNS, enabling direct Pod-to-Pod communication for stateful workloads like databases.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: A Service provides a stable IP address and DNS name for a set of Pods. — A is correct because a Kubernetes Service provides a stable virtual IP address and a DNS name (via CoreDNS) that remains constant even as the underlying Pods are created, destroyed, or scaled. This decouples clients from the ephemeral nature of Pod IPs, ensuring reliable connectivity.
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
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Last reviewed: Jun 30, 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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