KCNA Kubernetes Fundamentals Practice Question
Which TWO of the following statements about Kubernetes Deployments are correct? (Select 2)
⚠ Common exam trap
The CNCF exam often tests the distinction between Deployments and other controllers like DaemonSets, StatefulSets, and Jobs, so the trap here is confusing the purpose of Deployments (stateless, scalable apps) with controllers that handle per-node scheduling, stateful identities, or batch workloads.
Answer choices
Why each option matters
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
A is correct because Deployments provide a declarative update mechanism that supports rolling updates, where Pods are gradually replaced with new ones, and rollbacks, which revert the Deployment to a previous revision. This is achieved through the Deployment controller managing ReplicaSets, allowing seamless transitions between versions without downtime.
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
Deployments provide a declarative update strategy that supports rolling updates and rollbacks.
- ✗
Deployments ensure that a copy of a Pod runs on each node in the cluster
Why it's wrong here
DaemonSets ensure a pod runs on each node.
- ✗
Deployments are used for batch processing jobs that run to completion
Why it's wrong here
Batch jobs are managed by Jobs and CronJobs, not Deployments.
- ✓
Deployments manage the lifecycle of ReplicaSets
Why this is correct
A Deployment creates a ReplicaSet and manages its scaling and updates.
- ✗
Deployments provide stable network identities for Pods
Why it's wrong here
Stable network identities are provided by StatefulSets, not Deployments.
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