This KCNA practice question tests your understanding of kubernetes fundamentals. 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.
You create a Deployment with 'replicas: 3' and update the pod template without changing the selector. After the update, you notice that only the new Pods are running, but old Pods have been terminated. What is the default update strategy?
OnDelete
Why wrong: OnDelete is for DaemonSets, not Deployments.
BlueGreen
Why wrong: BlueGreen is not a native Kubernetes strategy; it requires manual or tool-based implementation.
RollingUpdate
RollingUpdate gradually replaces Pods; old ones are terminated as new ones become ready.
Recreate
Why wrong: Recreate terminates all old Pods before creating new ones, not gradual.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
RollingUpdate
The default strategy for Deployments is RollingUpdate, which gradually replaces old Pods with new ones without downtime, and by default it keeps no old Pods running after the update completes.
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
For each option: why learners choose it and why it is or isn't the right answer here.
OnDelete
Why it's wrong here
OnDelete is for DaemonSets, not Deployments.
BlueGreen
Why it's wrong here
BlueGreen is not a native Kubernetes strategy; it requires manual or tool-based implementation.
RollingUpdate
Why this is correct
RollingUpdate gradually replaces Pods; old ones are terminated as new ones become ready.
Related concept
Static NAT maps one inside address to one outside address.
Recreate
Why it's wrong here
Recreate terminates all old Pods before creating new ones, not gradual.
Common exam traps
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
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.
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
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.
What to study next
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 KCNA NAT questions on configuration and troubleshooting.
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FAQ
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Static NAT maps one inside address to one outside address..
The correct answer is: RollingUpdate — The default strategy for Deployments is RollingUpdate, which gradually replaces old Pods with new ones without downtime, and by default it keeps no old Pods running after the update completes.
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 KCNA NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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