KCNA Cloud Native Patterns 5

Question 1

What is the primary purpose of a service registry in a microservices architecture?

Accepted Answer

Tracks the network locations of service instances for dynamic discovery

Answer

A service registry maintains a dynamic list of available service instances and their addresses, enabling service discovery in environments where instances change frequently.

Question 2

Which pattern allows a new microservice to gradually take over functionality from a monolith without requiring a big-bang rewrite?

Accepted Answer

Strangler Fig

Answer

Strangler Fig wraps the monolith and incrementally routes functionality to new microservices, eventually replacing the monolith entirely.

Question 3

What does the principle of 'loose coupling' mean in microservices design?

Accepted Answer

Services have minimal dependencies on each other's internals and can change independently

Answer

Loose coupling means services interact through well-defined interfaces without knowledge of each other's implementation, enabling independent deployment and evolution.

Question 4

In Event Sourcing, how is the application state stored?

Accepted Answer

As an ordered log of domain events rather than current state snapshots

Answer

Event Sourcing stores every change as an immutable event, reconstructing current state by replaying the event log from the beginning.

Question 5

Which cloud native pattern involves deploying a proxy alongside a legacy application to add capabilities like logging or TLS without modifying its code?

Accepted Answer

Sidecar

Answer

The Sidecar pattern attaches a companion container to the main application to extend or enhance it without changing the application's code.

(KCNA) Kubernetes and Cloud Native Associate Practice Test

(KCNA) Kubernetes and Cloud Native Associate Practice Test

KCNA Cloud Native Patterns 5