This CKAD practice question tests your understanding of application deployment. 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.
In a Deployment, what is the purpose of the 'maxUnavailable' field in the rolling update strategy?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The maximum number of pods that can be unavailable during the update.
In a Deployment's rolling update strategy, the 'maxUnavailable' field specifies the maximum number of Pods that can be unavailable during the update process. This ensures that the Deployment maintains a certain level of availability by controlling how many Pods can be taken down at any given time, relative to the desired replica count. It is defined as either an absolute number or a percentage of the desired Pods, and it works alongside 'maxSurge' to manage the update's pace and safety.
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 maximum number of pods that can be terminated at once.
Why it's wrong here
While related, it specifically defines unavailability count.
✓
The maximum number of pods that can be unavailable during the update.
Why this is correct
Correct definition.
Related concept
Read the scenario before looking for a memorised answer.
✗
The maximum time allowed for the rollout to complete.
Why it's wrong here
There is no such field; progressDeadlineSeconds exists for deadline.
✗
The maximum number of pods that can be created above the desired replicas.
Why it's wrong here
That describes maxSurge.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'maxUnavailable' with 'maxSurge', thinking it controls the number of Pods created above the desired count, when in fact 'maxUnavailable' governs the number of Pods that can be unavailable, while 'maxSurge' controls the number of extra Pods created above the desired replicas.
Detailed technical explanation
How to think about this question
Under the hood, 'maxUnavailable' works with the ReplicaSet controller to ensure that during a rolling update, the total number of unavailable Pods (e.g., terminating, pending, or unhealthy) never exceeds the specified value. For example, if a Deployment has 10 replicas and 'maxUnavailable' is set to 25%, the controller ensures at least 7 Pods are always available (100% - 25% = 75%). This is critical in production scenarios where maintaining a minimum service capacity is required, such as during a canary deployment or when updating a critical web service.
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 CKAD question in full detail.
Application Deployment — This question tests Application Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The maximum number of pods that can be unavailable during the update. — In a Deployment's rolling update strategy, the 'maxUnavailable' field specifies the maximum number of Pods that can be unavailable during the update process. This ensures that the Deployment maintains a certain level of availability by controlling how many Pods can be taken down at any given time, relative to the desired replica count. It is defined as either an absolute number or a percentage of the desired Pods, and it works alongside 'maxSurge' to manage the update's pace and safety.
What should I do if I get this CKAD 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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