This CKA practice question tests your understanding of workloads and scheduling. 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.
Which THREE of the following are characteristics of a StatefulSet? (Select 3)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pods are started and terminated in a controlled order (sequentially)
Options A, B, and C are correct. StatefulSets provide stable network identities (ordinal hostnames), ordered pod management (sequential start/stop), and persistent storage per pod (PVC templates). Option D is incorrect because DaemonSets run pods on every node, not StatefulSets. Option E is incorrect because StatefulSets use a headless service for stable network identities, not a ClusterIP service.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Pods are started and terminated in a controlled order (sequentially)
Why this is correct
The default pod management policy is OrderedReady, which ensures ordered operations.
Related concept
Static NAT maps one inside address to one outside address.
✓
Each pod can have its own persistent volume claim (PVC)
Why this is correct
StatefulSets can define a volumeClaimTemplate to create a unique PVC for each pod.
Related concept
Static NAT maps one inside address to one outside address.
✗
Pods are automatically distributed across all nodes in the cluster
Why it's wrong here
That is a characteristic of DaemonSets, not StatefulSets.
✗
StatefulSets require a ClusterIP service for stable network identities
Why it's wrong here
StatefulSets typically use a headless service (ClusterIP: None) for stable network identities.
✓
Each pod has a unique, stable network identity (e.g., web-0, web-1)
Why this is correct
StatefulSet pods are assigned ordinal names that persist across rescheduling.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKA NAT questions on configuration and troubleshooting.
Workloads and Scheduling — This question tests Workloads and Scheduling — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Pods are started and terminated in a controlled order (sequentially) — Options A, B, and C are correct. StatefulSets provide stable network identities (ordinal hostnames), ordered pod management (sequential start/stop), and persistent storage per pod (PVC templates). Option D is incorrect because DaemonSets run pods on every node, not StatefulSets. Option E is incorrect because StatefulSets use a headless service for stable network identities, not a ClusterIP service.
What should I do if I get this CKA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKA NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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