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.
You have a Deployment with the following rollout strategy: rollingUpdate: maxSurge: 1, maxUnavailable: 0. What behavior does this configuration enforce?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rollout will create one additional pod before terminating the old pod, ensuring zero downtime
Option D is correct because the rolling update strategy `maxSurge: 1, maxUnavailable: 0` ensures that during the rollout, one additional pod is created above the desired replica count before any existing pod is terminated. This guarantees that the total number of available pods never drops below the desired count, achieving zero downtime. The `maxUnavailable: 0` setting prevents any pod from being taken down until a new one is ready, while `maxSurge: 1` allows one extra pod to be created temporarily.
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 rollout will terminate all old pods at once and then create new ones
Why it's wrong here
That would be a Recreate strategy.
✗
The rollout will create all new pods first, then delete all old pods
Why it's wrong here
That would require maxSurge=desired, but maxSurge=1 only allows one extra.
✗
The rollout will terminate one old pod before creating a new one
Why it's wrong here
That would be maxSurge=0, maxUnavailable=1.
✓
The rollout will create one additional pod before terminating the old pod, ensuring zero downtime
Why this is correct
This strategy ensures at least desired replicas are always running.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `maxSurge` and `maxUnavailable` with simple 'one-by-one' termination, failing to realize that `maxUnavailable: 0` forces the creation of a new pod before any old pod is removed, ensuring zero downtime.
Detailed technical explanation
How to think about this question
Under the hood, the ReplicaSet controller manages the desired and actual pod counts, and the Deployment controller orchestrates the rollout by scaling up the new ReplicaSet and scaling down the old one in increments defined by `maxSurge` and `maxUnavailable`. In this configuration, the controller first creates a new pod (surge), waits for it to become ready (as per readiness probes), then terminates one old pod, repeating the cycle until all pods are updated. A real-world scenario where this matters is in production environments serving live traffic, where even a single pod's unavailability could cause a brief service disruption or degrade SLAs.
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 KCNA question in full detail.
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The rollout will create one additional pod before terminating the old pod, ensuring zero downtime — Option D is correct because the rolling update strategy `maxSurge: 1, maxUnavailable: 0` ensures that during the rollout, one additional pod is created above the desired replica count before any existing pod is terminated. This guarantees that the total number of available pods never drops below the desired count, achieving zero downtime. The `maxUnavailable: 0` setting prevents any pod from being taken down until a new one is ready, while `maxSurge: 1` allows one extra pod to be created temporarily.
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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