- A
Encrypt traffic by configuring TLS certificates in each pod's environment variables and updating the application code to use HTTPS.
Why wrong: This requires significant code changes and manual certificate management, not minimal overhead.
- B
Use Kubernetes NetworkPolicies to restrict pod-to-pod communication based on labels and namespaces, and enable TLS in each service's code.
Why wrong: NetworkPolicies control traffic but do not provide encryption or authentication; TLS in code requires application changes.
- C
Deploy Istio as a service mesh with mutual TLS enabled and configure AuthorizationPolicy resources to allow only required traffic between services.
Istio provides transparent mTLS and fine-grained authorization without code changes, meeting all requirements.
- D
Move all services to a separate overlay network using Weave Net and enforce egress rules with iptables on each node.
Why wrong: This approach adds complexity, does not provide built-in mTLS, and requires manual iptables management.
CKS Minimize Microservice Vulnerabilities Practice Question
This CKS practice question tests your understanding of minimize microservice vulnerabilities. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are a Kubernetes administrator for a fintech company that runs a payment processing service in a production cluster. The service consists of multiple microservices that communicate over the network. Recently, a security audit revealed that a compromised pod could potentially send malicious requests to other services because there are no network restrictions between pods. The security team has mandated that all inter-service traffic must be encrypted and authenticated, and that only necessary traffic should be allowed. You need to implement a solution that meets these requirements with minimal changes to the application code and minimal operational overhead. Which approach should you take?
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
Deploy Istio as a service mesh with mutual TLS enabled and configure AuthorizationPolicy resources to allow only required traffic between services.
Option C is correct because deploying Istio as a service mesh with mutual TLS (mTLS) provides transparent encryption and authentication of all inter-service traffic without modifying application code. Istio's AuthorizationPolicy resources allow fine-grained, label-based access control to enforce the principle of least privilege, meeting the security mandate with minimal operational overhead through sidecar proxy injection.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Encrypt traffic by configuring TLS certificates in each pod's environment variables and updating the application code to use HTTPS.
Why it's wrong here
This requires significant code changes and manual certificate management, not minimal overhead.
- ✗
Use Kubernetes NetworkPolicies to restrict pod-to-pod communication based on labels and namespaces, and enable TLS in each service's code.
Why it's wrong here
NetworkPolicies control traffic but do not provide encryption or authentication; TLS in code requires application changes.
- ✓
Deploy Istio as a service mesh with mutual TLS enabled and configure AuthorizationPolicy resources to allow only required traffic between services.
Why this is correct
Istio provides transparent mTLS and fine-grained authorization without code changes, meeting all requirements.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Move all services to a separate overlay network using Weave Net and enforce egress rules with iptables on each node.
Why it's wrong here
This approach adds complexity, does not provide built-in mTLS, and requires manual iptables management.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think NetworkPolicies alone satisfy the encryption requirement, but NetworkPolicies only filter traffic at L3/L4 and do not provide any encryption or authentication, which is explicitly required by the security audit.
Detailed technical explanation
How to think about this question
Istio's mTLS works by injecting Envoy sidecar proxies into each pod, which intercept all inbound and outbound traffic and negotiate TLS 1.3 connections using SPIFFE-based identities. AuthorizationPolicy resources evaluate attributes like source principal, namespace, and HTTP methods against the request, enabling deny-by-default security. In a fintech environment, this approach ensures that even if a pod is compromised, the attacker cannot spoof identities or access unauthorized services without valid mTLS certificates.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Minimize Microservice Vulnerabilities — study guide chapter
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FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy Istio as a service mesh with mutual TLS enabled and configure AuthorizationPolicy resources to allow only required traffic between services. — Option C is correct because deploying Istio as a service mesh with mutual TLS (mTLS) provides transparent encryption and authentication of all inter-service traffic without modifying application code. Istio's AuthorizationPolicy resources allow fine-grained, label-based access control to enforce the principle of least privilege, meeting the security mandate with minimal operational overhead through sidecar proxy injection.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This CKS 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 CKS exam.
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