This KCNA practice question tests your understanding of container orchestration. 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.
Your application consists of a frontend and a backend. The frontend needs to communicate with the backend using a stable DNS name. The backend is deployed as a Deployment with 3 replicas. Which Kubernetes resource should you create to provide a stable DNS name for the backend?
Why wrong: EndpointSlice tracks which pods are endpoints of a Service, but does not provide a stable DNS name by itself.
B
Service of type NodePort
Why wrong: NodePort exposes the service on a port on each node's IP, typically for external access, but it also provides internal DNS. However, ClusterIP is the standard for internal communication.
C
Ingress
Why wrong: Ingress provides external HTTP/HTTPS routing, not internal DNS for pod-to-pod communication.
D
Service of type ClusterIP
A ClusterIP Service provides a stable internal IP and DNS name for pod-to-pod communication within the cluster.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Service of type ClusterIP
A Service of type ClusterIP provides a stable virtual IP and DNS name (e.g., my-service.namespace.svc.cluster.local) that load-balances traffic across the backend Pods. This is the correct resource because the frontend only needs a stable DNS name for internal cluster communication, and ClusterIP is the default Service type that fulfills this requirement without exposing the backend externally.
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.
✗
EndpointSlice
Why it's wrong here
EndpointSlice tracks which pods are endpoints of a Service, but does not provide a stable DNS name by itself.
✗
Service of type NodePort
Why it's wrong here
NodePort exposes the service on a port on each node's IP, typically for external access, but it also provides internal DNS. However, ClusterIP is the standard for internal communication.
✗
Ingress
Why it's wrong here
Ingress provides external HTTP/HTTPS routing, not internal DNS for pod-to-pod communication.
✓
Service of type ClusterIP
Why this is correct
A ClusterIP Service provides a stable internal IP and DNS name for pod-to-pod communication within the cluster.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that a Service of type NodePort is required for any DNS-based communication, but the trap here is that ClusterIP is the correct choice for internal cluster DNS stability, while NodePort is only needed for external access.
Detailed technical explanation
How to think about this question
A ClusterIP Service creates a stable virtual IP (VIP) that is backed by kube-proxy iptables or IPVS rules, and CoreDNS automatically registers a DNS A/AAAA record for the Service name. This DNS name resolves to the ClusterIP, which then load-balances traffic to the Pods using a round-robin or session-affinity algorithm. In real-world scenarios, this pattern is essential for microservices architectures where frontend Pods need to discover backend Pods reliably across restarts or scaling events.
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.
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: Service of type ClusterIP — A Service of type ClusterIP provides a stable virtual IP and DNS name (e.g., my-service.namespace.svc.cluster.local) that load-balances traffic across the backend Pods. This is the correct resource because the frontend only needs a stable DNS name for internal cluster communication, and ClusterIP is the default Service type that fulfills this requirement without exposing the backend externally.
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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Question Discussion
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