CKS Minimize Microservice Vulnerabilities Practice Question
This CKS practice question tests your understanding of minimize microservice vulnerabilities. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which THREE of the following are valid ways to enforce mTLS in an Istio service mesh? (Select 3)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DestinationRule with trafficPolicy.tls.mode set to ISTIO_MUTUAL
PeerAuthentication with mTLS mode (option A) enforces mTLS per namespace or workload. DestinationRule with tls settings (option B) configures client-side TLS settings. ServiceEntry can enable mTLS for external services (option D). Option C (NetworkPolicy) is for Kubernetes network policies, not TLS. Option E (AuthorizationPolicy) is for access control, not TLS configuration.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
DestinationRule with trafficPolicy.tls.mode set to ISTIO_MUTUAL
Why this is correct
Configures client-side mTLS for traffic to a specific host.
Related concept
Authentication checks who the user is.
✓
PeerAuthentication with mTLS mode set to STRICT
Why this is correct
Enforces mTLS for workloads in the namespace.
Related concept
Authentication checks who the user is.
✓
ServiceEntry with mTLS enabled for external services
Why this is correct
ServiceEntry can define mTLS settings for external services.
Related concept
Authentication checks who the user is.
✗
AuthorizationPolicy with deny rules for non-mTLS traffic
Why it's wrong here
AuthorizationPolicy controls access based on identities, but does not enforce mTLS itself.
✗
NetworkPolicy with ingress rules to allow only TLS traffic
Why it's wrong here
NetworkPolicy does not understand TLS; it operates at network layer.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CKS questions on access control and AAA configuration.
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: DestinationRule with trafficPolicy.tls.mode set to ISTIO_MUTUAL — PeerAuthentication with mTLS mode (option A) enforces mTLS per namespace or workload. DestinationRule with tls settings (option B) configures client-side TLS settings. ServiceEntry can enable mTLS for external services (option D). Option C (NetworkPolicy) is for Kubernetes network policies, not TLS. Option E (AuthorizationPolicy) is for access control, not TLS configuration.
What should I do if I get this CKS question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CKS questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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