Quiz 4: Back-End Service Layers & Interactions

In a typical back-end service layer, which component is primarily responsible for encapsulating business logic?

• Controllers

• Views

• Services

• Models

A diagram that illustrates the order of messages between different objects or components over time is called a:

• Entity-Relationship Diagram

• Flowchart

• Sequence Diagram

• Dataflow Diagram

Which architectural pattern discussed divides an application into Model, View, and Controller components?

• MVC

• Layered

• Microservices

• Event-driven

If a client-side application needs to retrieve user data from a server, it typically interacts with the back-end via a(n):

• UI Component

• Database Table

• API

• HTML Document

What does "separation of concerns" mean in the context of back-end architecture?

• All code should be in a single file.

• Each part of the system should have a distinct, well-defined responsibility.

• Developers should only focus on one part of the application.

• Security is the only concern for the backend.

Which back-end component is typically the first to receive an incoming HTTP request from the client?

• Service

• Model

• Controller

• Database Adapter

What is the purpose of an API endpoint (e.g., /users or /products/{id}) in a backend service?

• To display data to the user.

• To define specific URLs for accessing resources and performing actions.

• To manage server hardware.

• To store persistent data.

What is a "request body" in the context of API interaction?

• The header of an HTTP request.

• The URL path of an endpoint.

• The data sent by the client to the server, often in JSON format.

• The response sent back from the server.

Which diagram type focuses on illustrating how data moves through various processes and stores within a system?

• Sequence Diagram

• Class Diagram

• Dataflow Diagram

• State Diagram

What is the role of "validation" when handling requests in the back-end?

• To style the response data.

• To speed up database queries.

• To ensure that incoming data meets specific criteria before processing.

• To generate random data.