KCNA Kubernetes Fundamentals Practice Question
You want to isolate a team's workloads within a Kubernetes cluster so that they cannot see or access resources from other teams. Which feature should you use?
⚠ Common exam trap
The trap is that candidates confuse labels/selectors (which are for organization and routing within the same namespace) with namespaces (which provide true isolation and multi-tenancy across the cluster). This leads them to select Option B, thinking selectors control visibility, but they only filter resources within a namespace.
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
✓
Namespaces
Namespaces are the Kubernetes abstraction that provides a logical partition of the cluster, enabling multi-tenancy by isolating workloads, resources, and access controls. By default, RBAC policies and network policies can be scoped to a namespace, preventing teams from seeing or accessing resources in other namespaces.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Annotations
Why it's wrong here
Annotations attach non-identifying metadata to objects; they enforce no access boundaries, so teams still see and reach each other's resources. They are tempting because they label workloads for tooling and cost reporting. Namespaces, combined with RBAC and NetworkPolicy, provide the isolation the scenario requires.
- ✗
Labels and selectors
Why it's wrong here
Labels and selectors only group and query objects; they enforce no access boundary, so one team's pods can still reach another's. They are tempting because NetworkPolicy selectors rely on labels, but isolation itself requires NetworkPolicy objects, which labels merely target rather than implement.
- ✗
Resource quotas
Why it's wrong here
Resource quotas cap aggregate CPU, memory and object counts per namespace; they do not restrict network or API visibility between teams. They are tempting because namespaces already scope resources, but quotas address consumption limits, whereas NetworkPolicy supplies the actual isolation the scenario requires.
- ✓
Namespaces
Why this is correct
Namespaces partition a single cluster into logically isolated virtual clusters, scoping namespaced resources and their names so a team's workloads cannot see or access another team's objects. This satisfies the stem's isolation requirement without provisioning separate clusters, though network policies are still needed to restrict cross-namespace traffic.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
Go deeper
Related to this question
Learn chapter
Services and Network Connectivity
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
Namespaces
A Namespace in Kubernetes is a virtual cluster within a physical cluster that allows you to organize and isolate resources, like an apartment building with separate units for different tenants.
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JA
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.