KCSA Kubernetes Security Fundamentals Practice Question
Which TWO statements are true regarding Kubernetes NetworkPolicy default behaviors?
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
✓
By default, all pods in a cluster are non-isolated and accept traffic from any source.
By default, pods are non-isolated (all traffic allowed). When a NetworkPolicy selects pods and specifies ingress/egress, those specific directions become deny-by-default.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NetworkPolicies automatically block all traffic across all namespaces upon cluster installation.
Why it's wrong here
Clusters do not enable default-deny network isolation out of the box.
- ✓
By default, all pods in a cluster are non-isolated and accept traffic from any source.
Why this is correct
Cluster networking is open by default until policies are applied.
- ✓
When a NetworkPolicy selects a pod and specifies ingress rules, unallowed ingress traffic is blocked.
Why this is correct
Selecting pods with an ingress policy turns on ingress isolation for those pods.
- ✗
Egress traffic is blocked by default even if no NetworkPolicy is created.
Why it's wrong here
Egress is allowed by default until egress policies are enforced.
- ✗
NetworkPolicies apply to cluster nodes rather than individual pods.
Why it's wrong here
NetworkPolicies operate at the pod level using selectors.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CNCF / Linux Foundation exam blueprint
This KCSA practice question is part of Courseiva's free CNCF / Linux Foundation 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 KCSA exam.