This CKAD practice question tests your understanding of services and networking. 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 application requires Pods to communicate using hostNetwork: true. Which Kubernetes resource is still necessary for stable DNS names?
Headless Service
Why wrong: Headless Service does not provide a stable IP; only DNS for pod IPs.
Endpoints resource
Why wrong: Endpoints are automatically created by Service; not a standalone solution.
Regular Service (ClusterIP)
Regular Service provides stable DNS and IP; works with hostNetwork.
Ingress
Why wrong: Ingress is for HTTP/HTTPS external traffic, not internal DNS.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Regular Service (ClusterIP)
When Pods use hostNetwork: true, they share the node's network namespace and bypass the Pod network, so kube-proxy does not set up iptables rules for ClusterIP Services. However, a regular ClusterIP Service still creates stable DNS records (via CoreDNS) that resolve to the Service's virtual IP, which can then be used for stable DNS names even though direct ClusterIP connectivity is lost. This ensures that other components can discover the Pods via DNS without relying on Pod IPs that may change.
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.
Headless Service
Endpoints resource
Why it's wrong here
Endpoints are automatically created by Service; not a standalone solution.
Regular Service (ClusterIP)
Why this is correct
Regular Service provides stable DNS and IP; works with hostNetwork.
Related concept
Read the scenario before looking for a memorised answer.
Ingress
Common exam traps
The trap here is that candidates assume hostNetwork: true eliminates the need for any Service, but DNS resolution still depends on the Service object existing in the cluster, even if the ClusterIP is unreachable.
Detailed technical explanation
Under the hood, when hostNetwork: true is used, the Pod's /etc/resolv.conf is inherited from the node, and CoreDNS still serves DNS records for Services based on the Service object's metadata.name and namespace. A subtle behavior is that the Pod can still resolve the Service's DNS name to the ClusterIP, but any traffic sent to that ClusterIP will be dropped because kube-proxy's iptables rules are bypassed; this is a common pitfall in multi-node clusters where Pods on different nodes cannot reach each other via ClusterIP when using hostNetwork. In real-world scenarios like monitoring agents or CNI plugins that require host networking, engineers often pair hostNetwork Pods with a headless Service and use stateful sets or direct Pod DNS (via pod-specific SRV records) to maintain connectivity.
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
Services and Networking — This question tests Services and Networking — Read the scenario before looking for a memorised answer..
The correct answer is: Regular Service (ClusterIP) — When Pods use hostNetwork: true, they share the node's network namespace and bypass the Pod network, so kube-proxy does not set up iptables rules for ClusterIP Services. However, a regular ClusterIP Service still creates stable DNS records (via CoreDNS) that resolve to the Service's virtual IP, which can then be used for stable DNS names even though direct ClusterIP connectivity is lost. This ensures that other components can discover the Pods via DNS without relying on Pod IPs that may change.
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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