This CKAD practice question tests your understanding of application deployment. 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.
What is the purpose of the 'maxUnavailable' field in a Deployment's rolling update configuration?
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.
The 'maxUnavailable' field in a Deployment's rolling update configuration specifies the maximum number of Pods that can be unavailable during the update process, relative to the desired replica count. This ensures that a controlled number of Pods are taken down at a time, maintaining application availability while the update progresses. It is defined as either an absolute number or a percentage of the desired replicas, and it works in conjunction with 'maxSurge' to control the update pace.
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 created above the desired replicas.
Why it's wrong here
That is maxSurge.
✓
The maximum number of Pods that can be unavailable during the update.
Why this is correct
Correct. It ensures a certain number of Pods remain available.
Related concept
Read the scenario before looking for a memorised answer.
✗
The maximum time allowed for the update to complete.
Why it's wrong here
There is no such field; progressDeadlineSeconds exists for that purpose.
✗
The maximum number of Pods to be terminated simultaneously.
Why it's wrong here
It controls unavailability, not termination batch size.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'maxUnavailable' with 'maxSurge' or assume it controls the termination rate, but the CKAD exam tests the precise definition that it limits the number of Pods that can be in an unavailable state during the update, not the number created above desired or the termination speed.
Detailed technical explanation
How to think about this question
Under the hood, 'maxUnavailable' is used by the Deployment controller to calculate how many Pods can be safely taken down at any point during a rolling update. For example, if set to 25% and the desired replicas are 4, the controller ensures no more than 1 Pod is unavailable at a time, scaling down old Pods only after new ones become ready. A subtle behavior is that 'maxUnavailable' interacts with 'maxSurge' to define the update budget; if both are set to 25%, the controller can temporarily have up to 125% of desired Pods running while ensuring at least 75% are available, which is critical for zero-downtime deployments in production.
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. — The 'maxUnavailable' field in a Deployment's rolling update configuration specifies the maximum number of Pods that can be unavailable during the update process, relative to the desired replica count. This ensures that a controlled number of Pods are taken down at a time, maintaining application availability while the update progresses. It is defined as either an absolute number or a percentage of the desired replicas, and it works in conjunction with 'maxSurge' to control the update pace.
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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