KCNA Kubernetes Fundamentals Practice Question
Which TWO of the following statements about Kubernetes namespaces are true?
⚠ Common exam trap
The trap is that many candidates think namespaces provide network isolation by default, but in reality, Kubernetes does not enforce inter-namespace network restrictions unless NetworkPolicies are explicitly applied.
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
✓
Deleting a namespace will delete all objects in it
Deleting a namespace triggers cascading deletion of all objects within it. Option D is correct because resource quotas can be applied per namespace to limit aggregate resource consumption. Option E is not entirely accurate: namespaces provide logical isolation, but dividing cluster resources among multiple users requires additional mechanisms like RBAC and resource quotas. Without those, namespaces alone do not enforce resource division.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Services in different namespaces cannot communicate with each other
Why it's wrong here
Incorrect. Services in different namespaces can communicate with each other using the fully qualified domain name (e.g., <service>.<namespace>.svc.cluster.local).
- ✗
Every Kubernetes object must be created in a namespace
Why it's wrong here
Incorrect. Some Kubernetes objects are cluster-scoped (e.g., Nodes, PersistentVolumes, Namespaces) and do not belong to a namespace.
- ✓
Deleting a namespace will delete all objects in it
Why this is correct
Correct. Deleting a namespace deletes all objects inside it.
- ✓
Namespaces can be used to implement resource quotas
Why this is correct
Correct. Resource quotas are namespace-scoped.
- ✗
Namespaces provide a way to divide cluster resources between multiple users
Why it's wrong here
Incorrect. Namespaces provide scoping but do not by themselves divide resources between users.
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
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
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.