Quick Answer
The answer is a ClusterIP service, because it assigns the backend API a virtual IP address that is only reachable from within the Kubernetes cluster, enabling the frontend to communicate with it while blocking all external traffic. This works by creating an internal load-balanced endpoint that other pods can discover via DNS, making it the default and most secure choice for internal microservice communication. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding of Kubernetes service types and network isolation—a common trap is choosing NodePort or LoadBalancer, which both expose the service externally. Remember that ClusterIP is the only type that inherently prevents outside access. A quick memory tip: think "ClusterIP = Cluster Internal Only," so if the requirement says "internal only," your answer is always ClusterIP.
This CV0-004 practice question tests your understanding of deployment. 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 cloud engineer is deploying a containerized application using Kubernetes. The application consists of a frontend, a backend API, and a database. The engineer needs to ensure that the backend API can be reached by the frontend but not from outside the cluster. Which Kubernetes resource should the engineer use to expose the backend API?
NodePort service
Why wrong: NodePort exposes the service on each node's IP, accessible externally.
ClusterIP service
ClusterIP provides internal-only access.
Ingress resource
Why wrong: Ingress typically exposes HTTP/HTTPS routes externally.
LoadBalancer service
Why wrong: LoadBalancer creates an external load balancer.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ClusterIP service
A ClusterIP service exposes the backend API on a cluster-internal IP address, making it reachable only from within the Kubernetes cluster. This meets the requirement that the frontend can communicate with the backend API, but external traffic is blocked. ClusterIP is the default service type and is ideal for internal service-to-service communication.
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.
NodePort service
Why it's wrong here
NodePort exposes the service on each node's IP, accessible externally.
ClusterIP service
Why this is correct
ClusterIP provides internal-only access.
Related concept
Read the scenario before looking for a memorised answer.
Ingress resource
Why it's wrong here
Ingress typically exposes HTTP/HTTPS routes externally.
LoadBalancer service
Why it's wrong here
LoadBalancer creates an external load balancer.
Common exam traps
The trap here is that candidates often confuse Ingress as a method to expose services internally, but Ingress is specifically designed for external HTTP/HTTPS traffic and does not restrict access to cluster-internal communication.
Detailed technical explanation
Under the hood, a ClusterIP service is backed by kube-proxy, which uses iptables or IPVS rules to forward traffic from the service's virtual IP (VIP) to the selected pods. The VIP is only routable within the cluster network (e.g., 10.96.0.0/12 by default), and no external DNS or routing is configured. In a real-world scenario, if the backend API needs to be accessed by other microservices or by the frontend running in the same cluster, ClusterIP is the standard choice, and it can be combined with a headless service for stateful workloads like databases.
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 CV0-004 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
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
The correct answer is: ClusterIP service — A ClusterIP service exposes the backend API on a cluster-internal IP address, making it reachable only from within the Kubernetes cluster. This meets the requirement that the frontend can communicate with the backend API, but external traffic is blocked. ClusterIP is the default service type and is ideal for internal service-to-service communication.
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 CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.
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