A Backstage backend plugin needs to expose a custom endpoint that the frontend will call to retrieve a list of services. What is the standard way to implement this in the backend?

Create a WebSocket server in the backend plugin to stream the data continuously.

Define a REST API route in the backend plugin that returns JSON data.

Use a server-side template to render the data into the frontend's HTML.

Embed the data directly in the frontend plugin's code.

What is the primary role of the Backstage backend in the overall architecture?

To execute client-side JavaScript code for the frontend.

To serve static assets and render the user interface.

To store all data in a local file system and manage user sessions.

To provide REST APIs that serve data and functionality to the frontend.

A Backstage plugin needs to display data from an external service that requires an API key. Where should the API key be stored and used?

In the backend plugin, which makes the API call and returns the data to the frontend.

In a public environment variable that the frontend can read.

In the Backstage configuration file, which is accessible to the frontend.

In the frontend plugin, so it can be sent directly to the external service.

A Backstage instance is experiencing slow loading times for the frontend. The backend is healthy and responds quickly to direct API calls. Which of the following is the most likely cause?

The frontend is making too many sequential REST calls to the backend.

The backend is not scaling horizontally to handle the load.

The backend is using WebSocket instead of REST for data delivery.

The frontend is server-rendered and the backend is slow to generate HTML.

Certified Backstage Associate (CBA)

Domain 2Objective 4

Understand Backstage Client-Server Architecture CBA Practice Questions (Page 5)

Part of the Backstage Infrastructure domain, which accounts for 22% of the CBA exam. Linux Foundation does not publish an official question count, but from its 90-minute exam (~35–60 total, ~8–13 in this domain), expect 2–3 from this objective — we provide 24 practice questions to prepare you well beyond it. (estimate)

24questions here

5free pages

6concepts

22%of the exam

Questions 21–24

21application · medium
A Backstage backend plugin needs to expose a custom endpoint that the frontend will call to retrieve a list of services. What is the standard way to implement this in the backend?
Select an answer first
22foundation · easy
What is the primary role of the Backstage backend in the overall architecture?
Select an answer first
23application · medium
A Backstage plugin needs to display data from an external service that requires an API key. Where should the API key be stored and used?
Select an answer first
24application · medium
A Backstage instance is experiencing slow loading times for the frontend. The backend is healthy and responds quickly to direct API calls. Which of the following is the most likely cause?
Select an answer first

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