This KCNA practice question tests your understanding of cloud native architecture. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 features typically provided by a service mesh? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Observability through metrics and tracing
Service mesh provides traffic management (routing, canary releases), observability (metrics, tracing), and security (mTLS, authorization). Auto-scaling is handled by Horizontal Pod Autoscaler or custom metrics, not by the service mesh. Service discovery is often built into Kubernetes itself, though service mesh can enhance it, but it's not a core feature.
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.
✓
Observability through metrics and tracing
Why this is correct
Service mesh collects telemetry data for monitoring.
Related concept
Authentication checks who the user is.
✗
Auto-scaling of pods based on CPU
Why it's wrong here
Auto-scaling is not a service mesh feature; it's provided by HPA.
✓
Traffic management between services
Why this is correct
Service mesh enables fine-grained traffic routing and control.
Related concept
Authentication checks who the user is.
✓
Security with mutual TLS (mTLS)
Why this is correct
Service mesh encrypts traffic and provides identity-based access control.
Related concept
Authentication checks who the user is.
✗
Service discovery
Why it's wrong here
While service mesh can integrate with service discovery, it is not a primary feature; Kubernetes DNS already provides discovery.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA 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 KCNA questions on access control and AAA configuration.
Cloud Native Architecture — This question tests Cloud Native Architecture — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Observability through metrics and tracing — Service mesh provides traffic management (routing, canary releases), observability (metrics, tracing), and security (mTLS, authorization). Auto-scaling is handled by Horizontal Pod Autoscaler or custom metrics, not by the service mesh. Service discovery is often built into Kubernetes itself, though service mesh can enhance it, but it's not a core feature.
What should I do if I get this KCNA 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 KCNA 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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