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 of the following is a key difference between a service mesh and an API gateway?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Service mesh manages east-west traffic between services, while API gateway manages north-south traffic from external clients
Service mesh focuses on internal service-to-service communication within the cluster, while API gateway handles external traffic entering the cluster (north-south traffic). Both can perform traffic management, but their scopes differ.
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.
✗
Service mesh is only used in multi-cloud environments, while API gateway is for single-cloud
Why it's wrong here
Both can be used in any environment.
✓
Service mesh manages east-west traffic between services, while API gateway manages north-south traffic from external clients
Why this is correct
This correctly describes the primary traffic direction each handles.
Related concept
Authentication checks who the user is.
✗
Service mesh provides authentication and authorization, while API gateway does not
Why it's wrong here
Both can provide security features.
✗
Service mesh handles north-south traffic, while API gateway handles east-west traffic
Why it's wrong here
It's the opposite: service mesh handles east-west (internal) traffic, API gateway handles north-south (external) traffic.
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: Service mesh manages east-west traffic between services, while API gateway manages north-south traffic from external clients — Service mesh focuses on internal service-to-service communication within the cluster, while API gateway handles external traffic entering the cluster (north-south traffic). Both can perform traffic management, but their scopes differ.
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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