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.
A team wants to minimize downtime during a Deployment rollout. Which strategy ensures that new pods are created before old pods are terminated?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set strategy type to 'RollingUpdate' with maxSurge=1, maxUnavailable=0.
Option C is correct because setting `maxSurge=1` and `maxUnavailable=0` in a RollingUpdate strategy ensures that one additional pod is created above the desired replica count before any existing pod is terminated. This guarantees zero downtime by maintaining full capacity during the rollout, as new pods become ready before old ones are removed.
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.
✗
Set strategy type to 'Recreate'.
Why it's wrong here
Recreate terminates all old pods first, causing downtime.
✗
Set strategy type to 'RollingUpdate' with maxSurge=0, maxUnavailable=1.
Why it's wrong here
This allows one pod to be unavailable during update.
✓
Set strategy type to 'RollingUpdate' with maxSurge=1, maxUnavailable=0.
Why this is correct
New pods are created first, ensuring zero downtime.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set strategy type to 'RollingUpdate' with maxSurge=1, maxUnavailable=1.
Why it's wrong here
This allows one pod to be unavailable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `maxSurge` and `maxUnavailable` values, mistakenly thinking that allowing both a surge and an unavailable pod (option D) is safer, when in fact it can still cause a temporary capacity drop if the new pod is not ready before the old one is terminated.
Detailed technical explanation
How to think about this question
Under the hood, the Deployment controller uses a ReplicaSet to manage pods. With `maxSurge=1` and `maxUnavailable=0`, the controller creates a new ReplicaSet with one additional pod, waits for it to become Ready (as determined by readiness probes), and then scales down the old ReplicaSet. This ensures the desired replica count is always met, even during rolling updates. In real-world scenarios, this is critical for stateful applications or services behind a load balancer where any capacity loss could cause request failures.
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: Set strategy type to 'RollingUpdate' with maxSurge=1, maxUnavailable=0. — Option C is correct because setting `maxSurge=1` and `maxUnavailable=0` in a RollingUpdate strategy ensures that one additional pod is created above the desired replica count before any existing pod is terminated. This guarantees zero downtime by maintaining full capacity during the rollout, as new pods become ready before old ones are removed.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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