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.
Which TWO statements about Kubernetes Services are correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The default Service type is ClusterIP
Option C is correct because the default Service type in Kubernetes is ClusterIP, which exposes the Service on a cluster-internal IP address. This means the Service is only reachable from within the cluster, providing a stable internal endpoint for pod-to-pod communication without external exposure.
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.
✗
A Service can expose only one container port
Why it's wrong here
A Service can expose multiple ports with different names.
✗
A Service can only route traffic to pods on the same node as the Service
Why it's wrong here
Services route to any pod matching the selector, regardless of node.
✓
The default Service type is ClusterIP
Why this is correct
If no type is specified, ClusterIP is used.
Related concept
Read the scenario before looking for a memorised answer.
✓
A Service provides a stable IP address and DNS name for a set of pods
Why this is correct
This is the primary function of a Service.
Related concept
Read the scenario before looking for a memorised answer.
✗
A Service of type NodePort exposes the service only on the node where the pod is running
Why it's wrong here
NodePort exposes the service on every node in the cluster.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a Service can only expose one port or that NodePort is node-specific, when in fact multiple ports are supported and NodePort opens the port on every node in the cluster.
Detailed technical explanation
How to think about this question
Under the hood, a Service of type ClusterIP is backed by a virtual IP assigned from the cluster's service CIDR range, and kube-proxy implements iptables or IPVS rules to load-balance traffic to the selected pods. This abstraction allows pods to be scheduled, scaled, or failed across nodes without clients needing to track individual pod IPs. In real-world scenarios, ClusterIP is the foundation for internal microservice communication, enabling service discovery via DNS (e.g., <service>.<namespace>.svc.cluster.local).
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The default Service type is ClusterIP — Option C is correct because the default Service type in Kubernetes is ClusterIP, which exposes the Service on a cluster-internal IP address. This means the Service is only reachable from within the cluster, providing a stable internal endpoint for pod-to-pod communication without external exposure.
What should I do if I get this KCNA 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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