KCSA Platform Security Practice Question
An Ingress controller is deployed in a cluster, and security auditors request that incoming traffic must be restricted to specific trusted external CIDR blocks. Which standard Ingress annotation is commonly supported by popular Ingress controllers (such as ingress-nginx) to achieve IP-based allowlisting?
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
✓
nginx.ingress.kubernetes.io/whitelist-source-range
Popular Ingress controllers like ingress-nginx support annotations such as nginx.ingress.kubernetes.io/whitelist-source-range to restrict access to specified client IP CIDRs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ingress.kubernetes.io/allowed-source-cidrs
Why it's wrong here
This annotation format is incorrect for the ingress-nginx controller.
- ✗
networking.k8s.io/ip-filter
Why it's wrong here
Networking API group annotations are not used natively for IP filtering within standard Ingress controllers in this manner.
- ✓
nginx.ingress.kubernetes.io/whitelist-source-range
Why this is correct
This is the correct ingress-nginx annotation used to define allowed source IP ranges for incoming traffic.
- ✗
kubernetes.io/ingress.allow-ips
Why it's wrong here
This is not a standard or recognized annotation for ingress-nginx IP allowlisting.
Visual reference
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.