KCNA Container Orchestration Practice Question
You are designing a microservices application. Which of the following is a key principle of microservices architecture?
⚠ Common exam trap
CNCF often tests the misconception that microservices require a single shared database or a single programming language, confusing microservices with a distributed monolith; the trap here is assuming that 'fast communication' (Option B) justifies tight coupling, when in reality loose coupling is prioritized for resilience and independent deployability.
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
✓
Services are loosely coupled and can be deployed independently
Microservices architecture is fundamentally defined by loose coupling and independent deployability. Each service encapsulates its own domain logic, communicates via lightweight protocols like HTTP/REST or gRPC, and can be updated, scaled, or deployed without affecting other services. This aligns with the Kubernetes-native pattern of managing each microservice as a separate Deployment or StatefulSet, enabling continuous delivery and resilience.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Services are loosely coupled and can be deployed independently
Why this is correct
This enables agility and scalability.
- ✗
Services are tightly coupled to allow fast communication
Why it's wrong here
Tight coupling reduces flexibility and independent deployability.
- ✗
All services must be written in the same programming language
Why it's wrong here
Polyglot development is allowed.
- ✗
All services must share a common database
Why it's wrong here
Microservices often have their own databases to avoid tight coupling.
Go deeper
Related to this question
Learn chapter
Cloud Native Architecture and Concepts
Key term
Microservices Architecture
Microservices architecture is a way of building software as a collection of small, independent services that each handle one specific business function and communicate over a network.
Key term
ReplicaSet and Replication
A ReplicaSet ensures a specified number of identical pod instances are running at all times in Kubernetes, using replication to maintain availability and stability.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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