- A
You only need a single instance of the application
Why wrong: A single-instance application can be run with a Deployment with replicas:1; StatefulSet is overkill and not needed.
- B
You need stable, unique network identifiers (e.g., pod hostnames) that persist across reschedules
StatefulSets provide stable network identities (e.g., pod-0, pod-1) that are maintained across rescheduling.
- C
You need each pod to have its own persistent storage that is not shared
StatefulSets can define a VolumeClaimTemplate that creates a unique PersistentVolumeClaim for each pod.
- D
You need to deploy a stateless web application with multiple replicas
Why wrong: Stateless applications are better suited for Deployments, which provide simpler management and rolling updates.
- E
You need ordered, graceful deployment and scaling (e.g., pod-0 starts before pod-1)
StatefulSets support ordered pod creation and termination, which is important for applications like databases.
KCNA Kubernetes Fundamentals Practice Question
This KCNA practice question tests your understanding of kubernetes fundamentals. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 THREE of the following are valid reasons to use a StatefulSet instead of a Deployment? (Select 3)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
You need stable, unique network identifiers (e.g., pod hostnames) that persist across reschedules
StatefulSets provide stable, unique network identifiers (e.g., pod hostnames) that persist across reschedules because each pod gets a fixed ordinal index (e.g., pod-0, pod-1) and a corresponding DNS name (e.g., pod-0.statefulset.namespace.svc.cluster.local). This is essential for applications like databases (e.g., Cassandra, ZooKeeper) that rely on consistent peer discovery and identity, which Deployments cannot guarantee since they assign random pod names and IPs.
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.
- ✗
You only need a single instance of the application
Why it's wrong here
A single-instance application can be run with a Deployment with replicas:1; StatefulSet is overkill and not needed.
- ✓
You need stable, unique network identifiers (e.g., pod hostnames) that persist across reschedules
Why this is correct
StatefulSets provide stable network identities (e.g., pod-0, pod-1) that are maintained across rescheduling.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
You need each pod to have its own persistent storage that is not shared
Why this is correct
StatefulSets can define a VolumeClaimTemplate that creates a unique PersistentVolumeClaim for each pod.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
You need to deploy a stateless web application with multiple replicas
Why it's wrong here
Stateless applications are better suited for Deployments, which provide simpler management and rolling updates.
- ✓
You need ordered, graceful deployment and scaling (e.g., pod-0 starts before pod-1)
Why this is correct
StatefulSets support ordered pod creation and termination, which is important for applications like databases.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that StatefulSets are only for persistent storage, but the trap here is that candidates overlook the requirement for stable network identities and ordered operations, which are equally critical and distinct from storage needs.
Detailed technical explanation
How to think about this question
Under the hood, StatefulSets use a Headless Service (clusterIP: None) to create predictable DNS records for each pod, following the pattern <pod-name>.<service-name>.<namespace>.svc.cluster.local. This enables peer-to-peer discovery without a load balancer. In real-world scenarios, a Kafka cluster requires each broker to have a stable hostname for partition leadership and replication; a Deployment would break this because pod restarts change hostnames, causing cluster rebalancing.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Kubernetes Fundamentals — study guide chapter
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FAQ
Questions learners often ask
What does this KCNA question test?
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: You need stable, unique network identifiers (e.g., pod hostnames) that persist across reschedules — StatefulSets provide stable, unique network identifiers (e.g., pod hostnames) that persist across reschedules because each pod gets a fixed ordinal index (e.g., pod-0, pod-1) and a corresponding DNS name (e.g., pod-0.statefulset.namespace.svc.cluster.local). This is essential for applications like databases (e.g., Cassandra, ZooKeeper) that rely on consistent peer discovery and identity, which Deployments cannot guarantee since they assign random pod names and IPs.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 30, 2026
This KCNA 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 KCNA exam.
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