This KCNA practice question tests your understanding of cloud native architecture. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 migrating a legacy application to Kubernetes. The application requires persistent storage and needs to maintain session affinity. Which set of Kubernetes resources should they use?
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 headless Service and Service with session affinity.
StatefulSet is the correct choice because it provides stable, unique network identities and persistent storage per pod, which are essential for stateful applications. A headless Service allows direct pod-to-pod communication without load balancing, while a regular Service with session affinity (using `externalTrafficPolicy: Local` or `sessionAffinity: ClientIP`) ensures client requests stick to the same pod, maintaining session state.
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.
✗
Deployment with a ClusterIP Service and Ingress.
Why it's wrong here
Deployment pods are ephemeral and don't have stable identities; session affinity may not work reliably.
✗
Job with a LoadBalancer Service.
Why it's wrong here
Job is for batch tasks, not long-running stateful applications.
✗
DaemonSet with a NodePort Service.
Why it's wrong here
DaemonSet runs one pod per node, not suitable for stateful applications requiring persistent storage per pod.
✓
StatefulSet with a headless Service and Service with session affinity.
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 a Deployment with a standard Service is sufficient for stateful workloads, ignoring that StatefulSet is required for stable storage and identity, and that session affinity must be explicitly configured on the Service, not assumed from Ingress or LoadBalancer alone.
Detailed technical explanation
How to think about this question
Under the hood, StatefulSet uses a headless Service (clusterIP: None) to enable DNS-based pod discovery via SRV records, allowing clients to resolve individual pod IPs directly. Session affinity in a Service is implemented via the `sessionAffinity: ClientIP` field, which hashes the client's IP to a specific pod for a configurable timeout (default 10800 seconds), ensuring requests from the same client reach the same pod even if the pod restarts. In real-world scenarios like a legacy e-commerce cart application, this combination prevents session data loss during pod rescheduling.
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.
Cloud Native Architecture — This question tests Cloud Native Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: StatefulSet with a headless Service and Service with session affinity. — StatefulSet is the correct choice because it provides stable, unique network identities and persistent storage per pod, which are essential for stateful applications. A headless Service allows direct pod-to-pod communication without load balancing, while a regular Service with session affinity (using `externalTrafficPolicy: Local` or `sessionAffinity: ClientIP`) ensures client requests stick to the same pod, maintaining session state.
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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