GH-200 sample questions

Question 1

You are creating a workflow to build and push a Docker image to GitHub Container Registry (GHCR). You need to authenticate with the registry.

Which of the following is the BEST practice for authentication?

Accepted Answer

Use the `docker/login-action` with `registry: ghcr.io`, `username: ${{ github.actor }}`, and `password: ${{ secrets.GITHUB_TOKEN }}`.

Answer

GHCR does not require authentication for pushing from GitHub Actions.

Answer

Run `docker login ghcr.io -u ${{ github.actor }} -p ${{ secrets.MY_PAT }}` in a shell step.

Answer

Store credentials in `~/.docker/config.json` as a secret file.

Question 2

A developer wants to use PowerShell Core (`pwsh`) for a specific step on a Windows runner, instead of the default Windows PowerShell (`powershell`). How should they configure the step?

Accepted Answer

Specify `shell: pwsh` in the step configuration.

Answer

Use `runs-on: windows-latest-pwsh`.

Answer

Configure `defaults: run: shell: pwsh` at the job level.

Answer

Start the run script with `#!/bin/pwsh`.

Question 3

Which of the following activities can trigger a `pull_request` event? (Select TWO)

Accepted Answer

synchronize

Accepted Answer

opened

Answer

merged

Answer

commented

Question 4

You have a job that runs on `ubuntu-latest`. It clones the repository and builds a Java application. You notice the build fails because the repository files are found in `/home/runner/work/repo-name/repo-name` but your script expects them in the root of the workspace. What is the default behavior of `actions/checkout` regarding the path, and is this likely the issue?

Accepted Answer

It checks out code to `$GITHUB_WORKSPACE`. The issue is likely the script assuming an absolute path rather than using the working directory.

Answer

It does not checkout code by default; you must use `git clone` manually.

Answer

It checks out code to `/src`.

Answer

It requires `path: .` to checkout to the root.

Question 5

What is the maximum execution time for a job on a GitHub-hosted runner before it is automatically cancelled?

Accepted Answer

6 hours

Answer

60 minutes

Answer

Unlimited

Answer

72 hours

Question 6

You are architecting a CI/CD workflow for a monorepo containing a frontend application (in /client) and a backend API (in /api). You need to configure the workflow to trigger ONLY when changes are pushed to the main branch affecting the backend API code. Changes to documentation (Markdown files) inside the api directory should NOT trigger the workflow.

Which trigger configuration should you use?

Accepted Answer

on: push: branches: [ 'main' ] paths: [ 'api/**' ] paths-ignore: [ 'api/**/*.md' ]

Answer

on: push: branches: [ 'main' ] files: [ 'api/*' ] exclude: [ '**/*.md' ]

Answer

on: push: branches: [ 'main' ] paths: [ 'api/**', '!api/**/*.md' ]

Answer

on: push: branches: [ 'main' ] defaults: run: working-directory: api

Question 7

A DevOps engineer is configuring a scheduled workflow that must run every Monday at 8:00 AM UTC. The workflow is critical for weekly reporting.

Which cron schedule expression correctly implements this requirement?

Accepted Answer

0 8 * * 1

Answer

0 8 1 * *

Answer

0 8 * * MON

Answer

8 0 * * MON

Question 8

You are creating a workflow that accepts manual inputs to deploy a specific version of an application to a chosen environment. You need to ensure the environment input can only be one of three values: 'dev', 'staging', or 'prod'.

How should you define this input in the workflow_dispatch trigger?

Accepted Answer

Define the input with `type: choice` and provide a list of `options`.

Answer

Define the input with `type: environment` and list the environments in `default`.

Answer

Define the input with `type: string` and use a `validate` step in the job.

Answer

Use the `environment` keyword at the job level instead of inputs.

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