This CKA practice question tests your understanding of workloads & scheduling. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 of the following are valid reasons to use a StatefulSet instead of a Deployment?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application requires unique network identities (e.g., hostnames)
Option B is correct because StatefulSets assign each pod a unique, stable network identity (e.g., a hostname like 'web-0', 'web-1') derived from the StatefulSet's name and an ordinal index. This is essential for applications like databases (e.g., Cassandra, ZooKeeper) that rely on consistent hostnames for cluster membership and discovery. Deployments, in contrast, generate random pod names and do not guarantee stable network identities.
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.
✗
The application is a batch job that should run to completion
Why it's wrong here
Job is for batch jobs.
✓
The application requires unique network identities (e.g., hostnames)
Why this is correct
StatefulSet provides stable network identities.
Related concept
Read the scenario before looking for a memorised answer.
✗
The application needs to run on all nodes in the cluster
Why it's wrong here
DaemonSet is for running on all nodes.
✗
The application is stateless and can be scaled arbitrarily
Why it's wrong here
Stateless apps are better suited for Deployments.
✓
The application requires stable persistent storage that persists across pod rescheduling
Why this is correct
StatefulSet can use PersistentVolumeClaims that are retained.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the need for stable storage (Option E) with the need for stable network identities (Option B), or they mistakenly think a StatefulSet is required for any application that uses persistent volumes, when in fact a Deployment with a PersistentVolumeClaim can also provide stable storage if the pod is recreated on the same node; the key differentiator is the unique, ordinal-based network identity and ordered pod management that only a StatefulSet provides.
Detailed technical explanation
How to think about this question
StatefulSets use a headless Service (with `clusterIP: None`) to create DNS records for each pod, enabling stable network identities via SRV records or A/AAAA records. This allows stateful applications like etcd or MySQL Galera to discover each other by hostname even after rescheduling. Additionally, StatefulSets guarantee ordered, graceful deployment and scaling (e.g., pod `web-2` is created only after `web-1` is Running and Ready), which is critical for clustered applications that require sequential startup.
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 CKA 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 CKA question in full detail.
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The application requires unique network identities (e.g., hostnames) — Option B is correct because StatefulSets assign each pod a unique, stable network identity (e.g., a hostname like 'web-0', 'web-1') derived from the StatefulSet's name and an ordinal index. This is essential for applications like databases (e.g., Cassandra, ZooKeeper) that rely on consistent hostnames for cluster membership and discovery. Deployments, in contrast, generate random pod names and do not guarantee stable network identities.
What should I do if I get this CKA 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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