KCNA Container Orchestration Practice Question
An administrator needs to ensure that Pods from two different Deployments cannot communicate with each other. Which Kubernetes resource should be used?
⚠ Common exam trap
Many candidates confuse NetworkPolicy with RBAC or PodSecurityPolicy, mistakenly thinking that authorization or security contexts can control network traffic, when in fact only NetworkPolicy (with a compatible CNI) provides layer 3/4 isolation.
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
✓
NetworkPolicy
NetworkPolicy is the correct resource because it acts as a firewall for Kubernetes Pods, controlling ingress and egress traffic at the IP address and port level using layer 3/4 rules. By applying a NetworkPolicy that denies all traffic between the Pods of the two Deployments (e.g., using podSelector and ingress/egress rules with an empty `from` or `to` block), the administrator can enforce network isolation. This is the native Kubernetes mechanism for restricting Pod-to-Pod communication within a cluster.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NetworkPolicy
Why this is correct
NetworkPolicy defines ingress/egress rules for pod communication.
- ✗
RBAC Role
Why it's wrong here
RBAC controls API access permissions.
- ✗
PodSecurityPolicy
Why it's wrong here
PSP is for security contexts, not network isolation.
- ✗
ResourceQuota
Why it's wrong here
ResourceQuota limits resource usage per namespace.
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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.