GH-200 sample questions

Question 1

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.

Question 2

CASE STUDY: GlobalLogistics Corp

GlobalLogistics has a complex deployment pipeline. The workflow `deploy.yml` consists of three jobs: `build`, `test`, and `deploy`.

Requirements:
1. `build` must run first.
2. `test` must run only if `build` succeeds.
3. `deploy` must run only if `test` succeeds.
4. If `test` fails, a special cleanup job called `report-failure` must run to upload logs to an S3 bucket.

How should you configure the `report-failure` job dependencies?

Accepted Answer

needs: test
if: failure()

Answer

runs-on: ubuntu-latest
if: job.status == 'failure'

Answer

needs: build
if: failure()

Answer

needs: [test, deploy]
if: always()

Question 3

You need to select a runner for a job that requires a Linux environment with 64GB of RAM and custom GPU drivers installed. You have configured a self-hosted runner with these specifications and assigned it the labels: `linux`, `x64`, `gpu`, and `high-mem`.

Which `runs-on` configuration ensures the job lands on this specific runner or one with identical capabilities? (Select TWO)

Accepted Answer

runs-on: [self-hosted, linux, high-mem, gpu]

Accepted Answer

runs-on:
group: Default
labels: [linux, high-mem, gpu]

Answer

runs-on: [linux, gpu]

Answer

runs-on: ubuntu-latest

Question 4

A developer defines an environment variable `API_KEY` at the workflow level, but redefines it with a different value in a specific job, and again within a specific step.

When the step executes, which value of `API_KEY` will be used?

Accepted Answer

The value defined at the step level.

Answer

The value defined at the workflow level.

Answer

The workflow will fail due to a variable name conflict.

Answer

The value defined at the job level.

Question 5

You are maintaining a public repository. A contributor submits a Pull Request from a forked repository. Your workflow normally runs integration tests using a secret `DB_PASSWORD`.

Why does the workflow fail when triggered by the PR from the fork?

Accepted Answer

Secrets are not passed to runners for pull requests from forked repositories by default.

Answer

The contributor needs to be added as a collaborator to access secrets.

Answer

The secret must be defined in the `environment` scope to be accessible.

Answer

The GITHUB_TOKEN has insufficient permissions on forks.

Question 6

Your workflow requires a Redis database for integration testing. You want to configure a service container for Redis that is accessible to the job steps.

Which configuration correctly sets up the Redis service and maps the port?

Accepted Answer

services:
redis:
image: redis
ports:
- 6379:6379

Answer

services:
redis:
image: redis
expose:
- 6379

Answer

container:
image: redis
ports: [6379]

Answer

steps:
- uses: docker://redis
with:
ports: 6379

Question 7

True or False: The automatic `GITHUB_TOKEN` secret always has read/write permissions to the repository contents by default, regardless of the organization or repository settings.

Accepted Answer

False

Answer

True

Question 8

You are using a matrix strategy to test your application on multiple Node.js versions (14, 16, 18) and Operating Systems (ubuntu-latest, windows-latest). However, you know that Node.js 14 is incompatible with windows-latest.

How do you exclude this specific combination from the matrix?

Accepted Answer

strategy:
matrix:
os: [ubuntu-latest, windows-latest]
node: [14, 16, 18]
exclude:
- os: windows-latest
node: 14

Answer

strategy:
matrix:
os: [ubuntu-latest, windows-latest]
node: [14, 16, 18]
include:
- os: windows-latest
node: !14

Answer

You cannot exclude combinations; you must list all desired combinations manually using `include`.

Answer

Use an `if` condition in the steps: `if: matrix.os != 'windows-latest' && matrix.node != 14`

Free GH-200 sample questions

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?

A developer defines an environment variable `API_KEY` at the workflow level, but redefines it with a different value in a specific job, and again within a specific step. When the step executes, which value of `API_KEY` will be used?

You are maintaining a public repository. A contributor submits a Pull Request from a forked repository. Your workflow normally runs integration tests using a secret `DB_PASSWORD`. Why does the workflow fail when triggered by the PR from the fork?

Your workflow requires a Redis database for integration testing. You want to configure a service container for Redis that is accessible to the job steps. Which configuration correctly sets up the Redis service and maps the port?

True or False: The automatic `GITHUB_TOKEN` secret always has read/write permissions to the repository contents by default, regardless of the organization or repository settings.

You are using a matrix strategy to test your application on multiple Node.js versions (14, 16, 18) and Operating Systems (ubuntu-latest, windows-latest). However, you know that Node.js 14 is incompatible with windows-latest. How do you exclude this specific combination from the matrix?

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