KCSA Overview OF Cloud Native Security Practice Question
When evaluating cloud native security principles, why is reliance on a traditional network firewall (perimeter security) considered insufficient for modern Kubernetes environments?
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
✓
Because container workloads have dynamic IP addresses and high east-west traffic that perimeter firewalls cannot inspect effectively
Kubernetes environments feature dynamic IP addresses, east-west traffic between microservices, and ephemeral workloads, making static perimeter firewalls inadequate.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Because Kubernetes natively disables all network traffic by default
Why it's wrong here
Kubernetes allows all traffic by default unless NetworkPolicies are applied.
- ✗
Because cloud providers prohibit the use of firewalls
Why it's wrong here
Cloud providers offer security groups and firewalls.
- ✓
Because container workloads have dynamic IP addresses and high east-west traffic that perimeter firewalls cannot inspect effectively
Why this is correct
Microservices communicate dynamically across nodes (east-west), bypassing traditional static perimeters.
- ✗
Because firewalls cannot run on Linux operating systems
Why it's wrong here
Firewalls run extensively on Linux (e.g., iptables, nftables).
About these practice questions
This KCSA question is part of Courseiva's 320-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.