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.
A developer has created a Deployment with 3 replicas. The application should be reachable from other Pods within the same cluster. Which Kubernetes resource should be used to provide a stable network endpoint?
Ingress
Why wrong: Ingress provides external access to Services, usually HTTP/HTTPS.
Service
Services provide stable endpoints for Pod communication.
PersistentVolumeClaim
Why wrong: PVCs request storage resources.
ConfigMap
Why wrong: ConfigMap stores configuration data.
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 provides a stable network endpoint (ClusterIP) that load-balances traffic across the Pod replicas, abstracting away Pod IP changes due to restarts or scaling. This allows other Pods within the cluster to reach the application reliably using the Service's DNS name, without needing to track individual Pod IPs.
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.
Ingress
Why it's wrong here
Ingress provides external access to Services, usually HTTP/HTTPS.
Service
Why this is correct
Services provide stable endpoints for Pod communication.
Related concept
Read the scenario before looking for a memorised answer.
PersistentVolumeClaim
Why it's wrong here
PVCs request storage resources.
ConfigMap
Why it's wrong here
ConfigMap stores configuration data.
Common exam traps
CNCF often tests the misconception that an Ingress is required for any network access, but the trap here is that Ingress is only for external (north-south) traffic, while internal Pod-to-Pod communication uses a Service.
Detailed technical explanation
A Service of type ClusterIP (default) assigns a virtual IP from a predefined range (e.g., 10.0.0.0/16) and uses iptables or IPVS rules on each node to forward traffic to healthy Pod endpoints. The kube-proxy component watches the Service and EndpointSlice objects, updating these rules dynamically when Pods are added or removed, ensuring zero-downtime routing. In real-world scenarios, a Service also enables DNS-based service discovery via CoreDNS, allowing Pods to resolve the Service name to its ClusterIP.
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
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
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: Service — A Service provides a stable network endpoint (ClusterIP) that load-balances traffic across the Pod replicas, abstracting away Pod IP changes due to restarts or scaling. This allows other Pods within the cluster to reach the application reliably using the Service's DNS name, without needing to track individual Pod IPs.
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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