CKAD Application Design and Build Practice Question
This CKAD practice question tests your understanding of application design and build. 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 THREE 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
✓
Each pod requires a stable, unique network identity.
StatefulSet assigns each pod a stable, unique network identity (e.g., a hostname like `web-0`, `web-1`) via a headless Service, which is critical for stateful applications like databases that rely on consistent DNS names for clustering and discovery. Deployments create pods with random, ephemeral hostnames, making them unsuitable for workloads requiring predictable 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 requires rolling updates.
Why it's wrong here
Both Deployments and StatefulSets support rolling updates.
✓
Each pod requires a stable, unique network identity.
Why this is correct
StatefulSets assign stable hostnames based on ordinal index.
Related concept
Read the scenario before looking for a memorised answer.
✓
Each pod needs its own persistent volume that persists across rescheduling.
Why this is correct
StatefulSets can use volumeClaimTemplates to give each pod a unique PVC.
Related concept
Read the scenario before looking for a memorised answer.
✗
The application cannot be scaled down.
Why it's wrong here
StatefulSets can be scaled down; pods are terminated in reverse order.
✓
Pods must be terminated in reverse order during shutdown.
Why this is correct
StatefulSets terminate pods from highest to lowest ordinal.
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 only StatefulSets support rolling updates, but both controllers do; the trap is confusing a shared feature with a unique StatefulSet capability.
Detailed technical explanation
How to think about this question
StatefulSet uses a headless Service (clusterIP: None) to create stable network identities via DNS SRV records, enabling pods to discover each other by name (e.g., `pod-name.service-name.namespace.svc.cluster.local`). This is essential for stateful applications like Cassandra or ZooKeeper, where each node must maintain a fixed identity for quorum and data replication, even after rescheduling to a different node.
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 CKAD question in full detail.
Application Design and Build — This question tests Application Design and Build — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Each pod requires a stable, unique network identity. — StatefulSet assigns each pod a stable, unique network identity (e.g., a hostname like `web-0`, `web-1`) via a headless Service, which is critical for stateful applications like databases that rely on consistent DNS names for clustering and discovery. Deployments create pods with random, ephemeral hostnames, making them unsuitable for workloads requiring predictable network identities.
What should I do if I get this CKAD 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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