EX294 Coordinate rolling updates Practice Question
This EX294 practice question tests your understanding of coordinate rolling updates. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
1
Option E is correct because the default rolling update strategy for a Deployment in Kubernetes sets `maxUnavailable` to 25% of the desired replicas, rounded up. With 4 replicas, 25% equals 1, so at most 1 pod can be unavailable during the update. This ensures minimal disruption while allowing the update to proceed.
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.
✗
2
Why it's wrong here
25% of 4 is 1, not 2.
✗
4
Why it's wrong here
All pods unavailable would violate the maxUnavailable setting.
✗
0
Why it's wrong here
MaxUnavailable is set to 25%, which is not zero.
✗
3
Why it's wrong here
25% of 4 is 1, not 3.
✓
1
Why this is correct
25% of 4 replicas is 1 pod.
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 assume the default `maxUnavailable` is 1 regardless of replica count, but it is actually 25% of the desired replicas, rounded up, so with 4 replicas it is 1, but with 5 replicas it would be 2 (25% of 5 = 1.25, rounded up to 2).
Detailed technical explanation
How to think about this question
Under the hood, the `maxUnavailable` field in the Deployment's rolling update configuration is an integer or percentage that defines the maximum number of pods that can be unavailable relative to the desired replicas during the update. The ReplicaSet controller ensures that the number of available pods never drops below `desired - maxUnavailable`. In real-world scenarios, setting `maxUnavailable` too high can cause service degradation, while setting it too low (e.g., 0) can slow down the rollout, especially with health checks that take time to pass.
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 practitioner preparing for the EX294 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Coordinate rolling updates — This question tests Coordinate rolling updates — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 1 — Option E is correct because the default rolling update strategy for a Deployment in Kubernetes sets `maxUnavailable` to 25% of the desired replicas, rounded up. With 4 replicas, 25% equals 1, so at most 1 pod can be unavailable during the update. This ensures minimal disruption while allowing the update to proceed.
What should I do if I get this EX294 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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