This KCNA practice question tests your understanding of kubernetes fundamentals. 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.
A Deployment is configured with 'strategy.type: RollingUpdate' and 'strategy.rollingUpdate.maxUnavailable: 0'. What is the effect during a rolling update?
The update will fail because maxUnavailable must be at least 1
Why wrong: maxUnavailable can be 0, but it may slow down the update.
B
The update will not proceed until at least one new pod is ready
Why wrong: The update can start but will not terminate old pods until new ones are ready.
C
The update will proceed without any downtime
Why wrong: While maxUnavailable=0 aims for zero-downtime, it does not guarantee it; the actual availability depends on other settings.
D
No pod will be terminated until a new pod is ready
With maxUnavailable=0, the controller cannot make any existing pods unavailable, so it must wait for new pods to become ready before terminating old ones.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No pod will be terminated until a new pod is ready
With maxUnavailable=0, the controller ensures no pods are unavailable during the update, but it may create new pods before terminating old ones, potentially causing resource contention.
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.
✗
The update will fail because maxUnavailable must be at least 1
Why it's wrong here
maxUnavailable can be 0, but it may slow down the update.
✗
The update will not proceed until at least one new pod is ready
Why it's wrong here
The update can start but will not terminate old pods until new ones are ready.
✗
The update will proceed without any downtime
Why it's wrong here
While maxUnavailable=0 aims for zero-downtime, it does not guarantee it; the actual availability depends on other settings.
✓
No pod will be terminated until a new pod is ready
Why this is correct
With maxUnavailable=0, the controller cannot make any existing pods unavailable, so it must wait for new pods to become ready before terminating old ones.
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 KCNA 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 KCNA NAT questions on configuration and troubleshooting.
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: No pod will be terminated until a new pod is ready — With maxUnavailable=0, the controller ensures no pods are unavailable during the update, but it may create new pods before terminating old ones, potentially causing resource contention.
What should I do if I get this KCNA 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 KCNA 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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