ICA Advanced Scenarios Practice Question
You are implementing multi-tenancy using Istio Namespaces. To ensure strict isolation where Service A in Namespace X cannot send traffic to Service B in Namespace Y, what is the best approach?
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
✓
Configure an AuthorizationPolicy in Namespace Y with a 'DENY' action for all principals.
AuthorizationPolicies are the primary tool for fine-grained access control. A 'deny-all' policy in the target namespace followed by explicit permit rules enforces strict isolation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure an AuthorizationPolicy in Namespace Y with a 'DENY' action for all principals.
Why this is correct
A default deny policy ensures that no cross-namespace traffic is allowed unless explicitly permitted.
- ✗
Set the global mesh config to 'REGISTRY_ONLY'.
Why it's wrong here
This restricts egress to external services, not internal cross-namespace traffic.
- ✗
Remove the service accounts from the mesh.
Why it's wrong here
Removing service accounts prevents authentication, but does not provide granular traffic isolation.
- ✗
Use Kubernetes NetworkPolicies instead of Istio.
Why it's wrong here
While K8s NetworkPolicies work, Istio AuthorizationPolicies provide L7 identity-based control, which is preferred in Istio-managed environments.
About these practice questions
This ICA question is part of Courseiva's 292-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 ICA 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 ICA exam.