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.
A development team is containerizing a monolithic application into microservices. Which practice aligns with cloud-native architecture principles?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Design each microservice with its own data store and communicate via APIs.
Option C is correct because cloud-native architecture principles advocate for decentralized data management, where each microservice owns its private data store and exposes functionality via well-defined APIs. This ensures loose coupling, independent scalability, and resilience, as services can evolve without impacting others. The pattern aligns with the Database per Service pattern, a core tenet of microservices design.
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.
✗
Use a shared database for all microservices to ensure data consistency.
Why it's wrong here
Shared databases create tight coupling and hinder independent deployments.
✗
Use JSON Web Tokens for authentication between microservices in the same cluster.
Why it's wrong here
JWTs add overhead for internal service-to-service communication; simpler mechanisms like mTLS are preferred.
✓
Design each microservice with its own data store and communicate via APIs.
Why this is correct
Each microservice owning its data store enables independent scaling and evolution.
Related concept
Read the scenario before looking for a memorised answer.
✗
Ensure all microservices have identical resource requests and limits.
Why it's wrong here
Microservices have different resource needs; uniform requests are inefficient and not a principle.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that 'shared data ensures consistency' (Option A) or that 'identical resource limits simplify management' (Option D), while the correct answer emphasizes data autonomy and API-based communication as the hallmark of cloud-native design.
Detailed technical explanation
How to think about this question
Under the hood, the Database per Service pattern is enforced by ensuring each microservice has its own schema and database instance, often using separate containers or namespaces. In Kubernetes, this is implemented via StatefulSets for stateful services, and communication between services uses REST/gRPC over a service mesh with mTLS (e.g., using Envoy sidecars) to encrypt traffic and enforce policies. A real-world scenario is an e-commerce platform where the Order service uses PostgreSQL, the Inventory service uses Redis, and the User service uses MongoDB—each independently scaled and backed up, preventing a single database failure from cascading.
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 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 KCNA question in full detail.
Cloud Native Architecture — This question tests Cloud Native Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Design each microservice with its own data store and communicate via APIs. — Option C is correct because cloud-native architecture principles advocate for decentralized data management, where each microservice owns its private data store and exposes functionality via well-defined APIs. This ensures loose coupling, independent scalability, and resilience, as services can evolve without impacting others. The pattern aligns with the Database per Service pattern, a core tenet of microservices design.
What should I do if I get this KCNA 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.
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Question Discussion
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