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.
An administrator needs to expose a set of pods running a web application on a static port on each node's IP address. Which Service type should they use?
ClusterIP
Why wrong: ClusterIP is only accessible within the cluster, not externally.
NodePort
NodePort opens a specific port on all nodes and routes traffic to the service.
ExternalName
Why wrong: ExternalName maps a service to a DNS name, not to node ports.
LoadBalancer
Why wrong: LoadBalancer provisions an external load balancer, but NodePort is the simplest if a static node port is needed.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NodePort
A NodePort service exposes the application on a static port (30000–32767) on every node's IP address, making the pods accessible externally via <NodeIP>:<NodePort>. This matches the requirement to expose pods on a static port on each node's IP address without needing an external load balancer.
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.
ClusterIP
Why it's wrong here
ClusterIP is only accessible within the cluster, not externally.
NodePort
Why this is correct
NodePort opens a specific port on all nodes and routes traffic to the service.
Related concept
Read the scenario before looking for a memorised answer.
ExternalName
Why it's wrong here
ExternalName maps a service to a DNS name, not to node ports.
LoadBalancer
Why it's wrong here
LoadBalancer provisions an external load balancer, but NodePort is the simplest if a static node port is needed.
Common exam traps
CNCF often tests the misconception that NodePort is the only way to expose services externally, but the trap here is confusing NodePort with LoadBalancer, which also provides external access but requires cloud provider integration and does not guarantee a static port on each node.
Detailed technical explanation
NodePort works by opening a port on the node's network namespace (iptables or IPVS) and forwarding traffic to the target pods via the ClusterIP service. The default NodePort range is 30000–32767, as defined in the Kubernetes API, and the kube-proxy component manages the routing rules. In a real-world scenario, NodePort is often used for development or bare-metal clusters where a cloud load balancer is unavailable.
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: NodePort — A NodePort service exposes the application on a static port (30000–32767) on every node's IP address, making the pods accessible externally via <NodeIP>:<NodePort>. This matches the requirement to expose pods on a static port on each node's IP address without needing an external load balancer.
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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