KCNA Cloud Native Application Delivery Practice Question
This KCNA practice question tests your understanding of cloud native application delivery. 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.
Which TWO statements are true about Kubernetes Deployments?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deployments support rolling updates and rollbacks.
Option A is correct because Deployments inherently support rolling updates and rollbacks through their declarative update strategy. When you change the pod template in a Deployment, it creates a new ReplicaSet and gradually scales it up while scaling down the old ReplicaSet, ensuring zero-downtime updates. If the update fails, you can roll back to a previous revision using `kubectl rollout undo`, which reverts the Deployment to a prior ReplicaSet state.
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.
✓
Deployments support rolling updates and rollbacks.
Why this is correct
Rolling updates and rollbacks are core features of Deployments.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deployments are the recommended controller for stateful applications.
Why it's wrong here
StatefulSets are recommended for stateful applications.
✓
A Deployment creates a ReplicaSet to ensure the desired number of pod replicas are running.
Why this is correct
Deployments manage ReplicaSets to maintain pod counts.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deployments can expose applications externally via a built-in load balancer.
Why it's wrong here
Services expose applications; Deployments do not provide external exposure.
✗
Deployments are used to run a pod on every node in the cluster.
Why it's wrong here
That is the role of a DaemonSet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that Deployments are suitable for stateful workloads or that they inherently expose applications externally, when in fact StatefulSets and Services are the correct components for those responsibilities.
Detailed technical explanation
How to think about this question
Under the hood, a Deployment manages ReplicaSets via a controller loop that reconciles the desired state with the current state. The rolling update strategy uses a `maxSurge` and `maxUnavailable` configuration (defaulting to 25% of desired replicas) to control the pace of updates. In real-world scenarios, this allows safe canary deployments where a small percentage of pods are updated first, and if metrics degrade, the rollout can be paused or rolled back without affecting all users.
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 KCNA 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
Cloud Native Application Delivery — This question tests Cloud Native Application Delivery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deployments support rolling updates and rollbacks. — Option A is correct because Deployments inherently support rolling updates and rollbacks through their declarative update strategy. When you change the pod template in a Deployment, it creates a new ReplicaSet and gradually scales it up while scaling down the old ReplicaSet, ensuring zero-downtime updates. If the update fails, you can roll back to a previous revision using `kubectl rollout undo`, which reverts the Deployment to a prior ReplicaSet state.
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.
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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