KCNA Kubernetes Fundamentals Practice Question
Which Kubernetes controller ensures that a specified number of pod replicas are running at all times?
⚠ Common exam trap
CNCF often tests the distinction between ReplicaSet and ReplicationController, trapping candidates who think ReplicationController is still the primary controller for replica management, when in fact ReplicaSet is the modern, recommended controller.
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
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ReplicaSet
A ReplicaSet is the Kubernetes controller that ensures a specified number of pod replicas are running at all times. It uses a label selector to match pods and maintains the desired replica count by creating or deleting pods as needed. ReplicaSet is the successor to ReplicationController and is primarily used by Deployments to manage pod scaling and self-healing.
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Related to this question
Learn chapter
Kubernetes Overview and Core Components
Key term
ReplicaSet and Replication
A ReplicaSet ensures a specified number of identical pod instances are running at all times in Kubernetes, using replication to maintain availability and stability.
Key term
Horizontal Pod Autoscaling
Horizontal Pod Autoscaling automatically adjusts the number of pod replicas in a Kubernetes cluster based on observed CPU, memory, or custom metrics.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA 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 KCNA exam.