This CKA practice question tests your understanding of troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 that is not scaling up beyond 1 replica despite setting replicas: 3. Which of the following could be the cause? (Select all that apply)
A PodDisruptionBudget is set with minAvailable: 1
Why wrong: PDB prevents voluntary disruptions, not scaling up; it does not block creation of new pods.
The ReplicaSet controller is malfunctioning
Though rare, if the controller is down or misconfigured, it won't create replicas. But in practice, ResourceQuota and capacity are more common.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A ResourceQuota in the namespace limits the number of pods
A ResourceQuota in the namespace can limit the total number of Pods that can be created. If the quota is set to a value that allows only one Pod (or the current count already meets the quota), the Deployment cannot scale beyond 1 replica. This is enforced by the API server during Pod creation, and the ReplicaSet controller will see the quota limit and stop creating additional Pods.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
A PodDisruptionBudget is set with minAvailable: 1
Why it's wrong here
PDB prevents voluntary disruptions, not scaling up; it does not block creation of new pods.
The ReplicaSet controller is malfunctioning
Why this is correct
Though rare, if the controller is down or misconfigured, it won't create replicas. But in practice, ResourceQuota and capacity are more common.
Related concept
Read the scenario before looking for a memorised answer.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CKA exam frequently reuses these exact scenarios with slightly different constraints.
Why this is wrong here
PDB prevents voluntary disruptions, not scaling up; it does not block creation of new pods.
Analysis generated from the official CKAblueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
The trap here is that candidates confuse PodDisruptionBudget with a scaling limiter, but PDB only restricts voluntary disruptions, not the number of replicas a Deployment can create.
Detailed technical explanation
ResourceQuotas are enforced at the admission control level via the API server, which rejects Pod creation requests that would exceed the quota. The ReplicaSet controller continuously attempts to create Pods but receives errors from the API server, leading to a stuck scaling state. In contrast, a PodDisruptionBudget uses a controller-manager loop to prevent voluntary evictions but does not interact with the ReplicaSet controller's scaling logic. Insufficient cluster resources (Option B) cause the scheduler to fail to place Pods, leaving them in Pending state, while a malfunctioning ReplicaSet controller (Option D) would fail to create or manage ReplicaSets entirely, often visible via events or controller logs.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKA 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
The correct answer is: A ResourceQuota in the namespace limits the number of pods — A ResourceQuota in the namespace can limit the total number of Pods that can be created. If the quota is set to a value that allows only one Pod (or the current count already meets the quota), the Deployment cannot scale beyond 1 replica. This is enforced by the API server during Pod creation, and the ReplicaSet controller will see the quota limit and stop creating additional Pods.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CKA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKA exam.
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