KCNA Cloud Native Architecture Practice Question
Which of the following is a benefit of using an API gateway pattern?
⚠ Common exam trap
KCNA often tests the misconception that an API gateway and a service mesh are interchangeable — candidates must distinguish north-south (gateway) from east-west (mesh) traffic.
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
✓
It provides a single entry point for clients and handles cross-cutting concerns
An API gateway sits in front of microservices and provides a single, unified entry point for all external clients, while centralizing cross-cutting concerns such as authentication, rate limiting, TLS termination, request routing, and logging. This decouples clients from the internal service topology, so services can be refactored or scaled without changing client code. It is a traffic-management and policy-enforcement layer, not a compute or storage layer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It reduces the number of microservices needed
Why it's wrong here
An API gateway fronts existing services; it does not decompose or remove microservices, so the service count is unchanged. It is tempting because the gateway hides backend topology from clients, and it would be correct when you need a single external endpoint aggregating calls to several already-deployed services.
- ✗
It replaces the need for a service mesh
Why it's wrong here
An API gateway handles north-south ingress concerns such as routing, authentication and rate limiting; service mesh handles east-west service-to-service traffic, mTLS and retries, so it cannot replace one. It is tempting because both sit in the request path, and it would be correct when consolidating external API exposure behind one entry point.
- ✓
It provides a single entry point for clients and handles cross-cutting concerns
Why this is correct
An API gateway consolidates disparate backend services behind one client-facing endpoint, so callers avoid coupling to individual service addresses. It also centralises cross-cutting concerns such as authentication, rate limiting, TLS termination and request routing, satisfying the stem's requirement for a single entry point that offloads duplicated logic from every service.
- ✗
It stores application state
Why it's wrong here
An API gateway routes, authenticates and rate-limits north-south client traffic; it holds no session state, so it cannot store application state. It is tempting because gateways do cache and transform payloads, and it would be correct when centralising external API entry, TLS termination and request routing to backend services.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CNCF exam blueprint
This KCNA 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 KCNA exam.