KCNA Kubernetes Fundamentals Practice Question
Which TWO statements about Kubernetes namespaces are true?
⚠ Common exam trap
Watch out — candidates often confuse namespaces with network isolation, assuming that simply placing resources in different namespaces automatically blocks cross-namespace traffic, when in fact Kubernetes allows all pod-to-pod communication across namespaces by default and requires explicit NetworkPolicy rules to restrict it.
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 are used to divide cluster resources between multiple users or teams.
Namespaces are a fundamental mechanism in Kubernetes for dividing cluster resources among multiple users or teams, enabling multi-tenancy and resource management through policies like Role-Based Access Control (RBAC) and ResourceQuotas. Option E is correct because ResourceQuotas are Kubernetes objects that can be applied to a namespace to enforce aggregate limits on CPU, memory, and other resources, preventing any single team from exhausting cluster capacity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All Kubernetes objects are namespaced.
Why it's wrong here
Incorrect; nodes and PersistentVolumes are cluster-scoped.
- ✗
Namespaces automatically isolate services in different namespaces from communicating.
Why it's wrong here
Incorrect; services can communicate across namespaces unless NetworkPolicies restrict.
- ✗
Namespaces provide network isolation between pods by default.
Why it's wrong here
Incorrect; network policies are required for network isolation.
- ✓
Namespaces are used to divide cluster resources between multiple users or teams.
Why this is correct
Correct; namespaces provide logical isolation.
- ✓
Resource quotas can be applied to a namespace to limit aggregate resource consumption.
Why this is correct
Correct; ResourceQuota objects limit resources per namespace.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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