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.
You want to expose a set of pods running on node port 30080 to external traffic. Which Service type should you use?
ExternalName
Why wrong: ExternalName maps to an external DNS name.
LoadBalancer
Why wrong: LoadBalancer provisions an external load balancer, but NodePort is simpler for a static port.
NodePort
NodePort opens a static port on each node's IP.
ClusterIP
Why wrong: ClusterIP is only accessible within the cluster.
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
Option C (NodePort) is correct because a NodePort service exposes the application on a static port (30080) on each node's IP address, making it accessible from outside the cluster via <NodeIP>:30080. This is the appropriate choice when you need to expose pods to external traffic using a specific port number without requiring a cloud 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.
ExternalName
Why it's wrong here
ExternalName maps to an external DNS name.
LoadBalancer
Why it's wrong here
LoadBalancer provisions an external load balancer, but NodePort is simpler for a static port.
NodePort
Why this is correct
NodePort opens a static port on each node's IP.
Related concept
Read the scenario before looking for a memorised answer.
ClusterIP
Why it's wrong here
ClusterIP is only accessible within the cluster.
Common exam traps
The trap here is that candidates confuse NodePort with LoadBalancer, thinking a cloud load balancer is required for external access, but NodePort directly exposes a static port on the node's IP without any cloud dependency.
Detailed technical explanation
Under the hood, a NodePort service allocates a port from the default range 30000-32767 on every node's iptables or IPVS rules, forwarding traffic to the target pods via the ClusterIP and kube-proxy. A subtle behavior is that the NodePort is opened on all nodes, even those not running the pods, so external traffic can hit any node and be routed correctly. In a real-world scenario, NodePort is often used for development or on-premises clusters where a static port is needed for testing, but it lacks advanced features like path-based routing or TLS termination that an Ingress controller provides.
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
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: NodePort — Option C (NodePort) is correct because a NodePort service exposes the application on a static port (30080) on each node's IP address, making it accessible from outside the cluster via <NodeIP>:30080. This is the appropriate choice when you need to expose pods to external traffic using a specific port number without requiring a cloud 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 24, 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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