This CKA practice question tests your understanding of storage. 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.
A team is designing a storage solution for a Cassandra cluster on Kubernetes. Each pod must have its own dedicated storage, and the cluster must be able to scale up and down dynamically. Which Kubernetes resource should be used to manage the storage?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
StatefulSet with a volumeClaimTemplate
StatefulSet is the correct choice because it provides stable, unique network identities and dedicated storage for each pod via a volumeClaimTemplate. This ensures each Cassandra pod gets its own PersistentVolume, which is essential for stateful applications that require data persistence and ordered scaling. The volumeClaimTemplate automatically provisions a unique PersistentVolumeClaim for each replica, enabling dynamic scaling up and down while preserving data integrity.
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.
✗
ReplicaSet with emptyDir volumes
Why it's wrong here
emptyDir is ephemeral and not persistent, which is unsuitable for Cassandra data.
✗
DaemonSet with hostPath volumes
Why it's wrong here
hostPath is node-specific and not suitable for stateful sets that need to be rescheduled.
✓
StatefulSet with a volumeClaimTemplate
Why this is correct
This creates a unique PVC for each pod, providing dedicated storage.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deployment with a single PersistentVolume shared by all pods
Why it's wrong here
Cassandra requires dedicated storage per node; sharing a volume would cause conflicts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Deployment with a shared PersistentVolume, mistakenly thinking it simplifies management, but they overlook the need for dedicated, persistent storage per pod and the ordered scaling guarantees that only StatefulSet provides.
Detailed technical explanation
How to think about this question
StatefulSet uses a volumeClaimTemplate to dynamically generate a PersistentVolumeClaim for each pod, which binds to a PersistentVolume provisioned by a StorageClass. This allows each Cassandra pod to have its own dedicated storage that persists across rescheduling, and the pod's ordinal index (e.g., cassandra-0, cassandra-1) ensures stable storage binding. In real-world scenarios, this is critical for Cassandra's rack-aware replication and node decommissioning, where each node's data must remain intact during scale-down operations.
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 CKA question in full detail.
Storage — This question tests Storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: StatefulSet with a volumeClaimTemplate — StatefulSet is the correct choice because it provides stable, unique network identities and dedicated storage for each pod via a volumeClaimTemplate. This ensures each Cassandra pod gets its own PersistentVolume, which is essential for stateful applications that require data persistence and ordered scaling. The volumeClaimTemplate automatically provisions a unique PersistentVolumeClaim for each replica, enabling dynamic scaling up and down while preserving data integrity.
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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