This CKAD practice question tests your understanding of application design and build. 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 needs to expose a deployment named 'web-app' running on port 8080 to external traffic. The cluster is on-premises with no cloud load balancer. Which service type should be used?
ExternalName
Why wrong: ExternalName maps to an external DNS name, not a service port.
ClusterIP
Why wrong: ClusterIP is only reachable within the cluster.
LoadBalancer
Why wrong: LoadBalancer requires a cloud provider; on-premises it behaves like NodePort but may not work.
NodePort
NodePort exposes a port on each node's IP address for external access.
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 D (NodePort) is correct because it exposes a service on a static port on each node's IP address, allowing external traffic to reach the 'web-app' deployment on port 8080 without requiring a cloud load balancer. In on-premises clusters, NodePort is the standard service type for external access when no cloud LB is available, as it opens a high-port (30000-32767) on every node that forwards traffic to the ClusterIP service.
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, not a service port.
ClusterIP
Why it's wrong here
ClusterIP is only reachable within the cluster.
LoadBalancer
Why it's wrong here
LoadBalancer requires a cloud provider; on-premises it behaves like NodePort but may not work.
NodePort
Why this is correct
NodePort exposes a port on each node's IP address for external access.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may choose LoadBalancer (C) by default when they see 'expose to external traffic,' forgetting that LoadBalancer requires a cloud provider's external LB, which is not available in on-premises clusters.
Detailed technical explanation
NodePort works by creating a ClusterIP service and then mapping a specific port (default range 30000-32767) on every node's IP to that ClusterIP. Traffic hitting any node's NodePort is routed via kube-proxy (using iptables or IPVS) to a healthy pod in the deployment, with source NAT applied to preserve return traffic. In production on-premises, NodePort is often combined with an external load balancer (e.g., HAProxy) or a reverse proxy (e.g., Nginx) to distribute traffic across nodes and avoid single points of failure.
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 CKAD 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
Application Design and Build — This question tests Application Design and Build — Read the scenario before looking for a memorised answer..
The correct answer is: NodePort — Option D (NodePort) is correct because it exposes a service on a static port on each node's IP address, allowing external traffic to reach the 'web-app' deployment on port 8080 without requiring a cloud load balancer. In on-premises clusters, NodePort is the standard service type for external access when no cloud LB is available, as it opens a high-port (30000-32767) on every node that forwards traffic to the ClusterIP service.
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 11, 2026
This CKAD 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 CKAD exam.
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