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.
Which TWO statements about Kubernetes Services are correct? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Service provides a stable endpoint for a set of pods.
Option B is correct because a Kubernetes Service provides a stable virtual IP and DNS name that remains constant even as the underlying pods are created, destroyed, or rescheduled. This decouples clients from the ephemeral nature of pod IPs, ensuring reliable connectivity to the pod group.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Services can only route traffic based on named ports.
Why it's wrong here
Services can use port numbers or named ports.
✓
A Service provides a stable endpoint for a set of pods.
Read the scenario before looking for a memorised answer.
✓
A Service uses label selectors to identify the target pods.
Why this is correct
Label selectors define which pods receive traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Services can only route traffic to pods in the same namespace.
Why it's wrong here
Services can route to any namespace if the selector matches, but a Service can only select pods in its own namespace.
✗
Every Service must have a cluster IP assigned.
Why it's wrong here
Headless Services have clusterIP set to None.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Services require a cluster IP or can only use named ports, but the CKAD exam tests knowledge of headless Services and the flexibility of port definitions.
Detailed technical explanation
How to think about this question
Under the hood, a Service's stable endpoint is implemented via iptables or IPVS rules on each node, which load-balance traffic to the pod IPs selected by the label selector. The kube-proxy component watches the API server for Service and EndpointSlice changes, updating these rules dynamically. A real-world scenario is a microservice architecture where a frontend Service must remain reachable even during rolling updates of backend pods, which the Service's label selector and endpoint management handle seamlessly.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Services and Networking — This question tests Services and Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Service provides a stable endpoint for a set of pods. — Option B is correct because a Kubernetes Service provides a stable virtual IP and DNS name that remains constant even as the underlying pods are created, destroyed, or rescheduled. This decouples clients from the ephemeral nature of pod IPs, ensuring reliable connectivity to the pod group.
What should I do if I get this CKAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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