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.
You have a microservices application deployed as a set of Pods in a Kubernetes cluster. You need to ensure that Pods can discover each other using stable DNS names. Which Kubernetes resource should you create?
ConfigMap
Why wrong: ConfigMap stores configuration data, not networking endpoints.
Ingress
Why wrong: Ingress is for external HTTP(S) traffic, not internal service discovery.
Service
A Service exposes a stable DNS name (e.g., my-service.namespace.svc.cluster.local) for Pods.
Deployment
Why wrong: A Deployment manages replicas of Pods but does not provide a stable DNS name.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Service
A Service of type ClusterIP (the default) provides a stable virtual IP and DNS name (e.g., my-service.namespace.svc.cluster.local) that resolves to the Pods selected by its label selector. This allows Pods to discover each other using consistent DNS names, regardless of Pod IP changes due to scaling or restarts. The kube-dns or CoreDNS addon automatically creates DNS records for Services, enabling service discovery within the cluster.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
ConfigMap
Why it's wrong here
ConfigMap stores configuration data, not networking endpoints.
Ingress
Why it's wrong here
Ingress is for external HTTP(S) traffic, not internal service discovery.
Service
Why this is correct
A Service exposes a stable DNS name (e.g., my-service.namespace.svc.cluster.local) for Pods.
Related concept
Read the scenario before looking for a memorised answer.
Deployment
Why it's wrong here
A Deployment manages replicas of Pods but does not provide a stable DNS name.
Common exam traps
CNCF often tests the misconception that a Deployment itself provides stable DNS names, but Deployments only manage Pod replicas; the Service resource is required to expose a stable network endpoint and DNS record.
Detailed technical explanation
Under the hood, each Service gets a DNS A/AAAA record from CoreDNS, which is queried by Pods using the cluster DNS resolver (typically at 10.96.0.10). The Service's ClusterIP is a virtual IP that iptables or IPVS rules load-balance traffic to the backing Pods. A subtle behavior is that headless Services (clusterIP: None) return Pod IPs directly via DNS, which is useful for stateful workloads like databases that need stable network identities.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
The correct answer is: Service — A Service of type ClusterIP (the default) provides a stable virtual IP and DNS name (e.g., my-service.namespace.svc.cluster.local) that resolves to the Pods selected by its label selector. This allows Pods to discover each other using consistent DNS names, regardless of Pod IP changes due to scaling or restarts. The kube-dns or CoreDNS addon automatically creates DNS records for Services, enabling service discovery within the cluster.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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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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