AT0-001 sample questions

Question 1

A systems engineer is writing a Python script to automate the cleanup of temporary files across several Linux servers. The engineer defines a variable `max_age_days = 30` at the very beginning of the script, outside of any functions. Inside a function named `clean_temp_files()`, the engineer attempts to reassign `max_age_days = 15` without any additional keywords. What is the result of this action in Python?

Accepted Answer

A new local variable named `max_age_days` is created within the function, leaving the global variable unchanged.

Answer

The script throws a SyntaxError because variables cannot be reassigned inside functions without the `var` keyword.

Answer

The script throws a RuntimeError indicating that global variables are immutable by default.

Answer

The global variable `max_age_days` is permanently changed to 15 for the entire script.

Question 2

When writing a Bash script to iterate over a list of server IP addresses stored in a text file, which loop construct is most appropriate for reading the file line by line? Select the correct keyword to fill in the blank.

_____ line in $(cat servers.txt); do
ping -c 1 $line
done

Accepted Answer

for

Answer

while

Answer

until

Answer

foreach

Question 3

An automation engineer is refactoring a monolithic PowerShell script into modular functions. The engineer wants to ensure that a custom function accepts parameters explicitly by name and enforces data typing. Which TWO of the following approaches can be used to define parameters for a PowerShell function? (Select TWO)

Accepted Answer

Using parentheses immediately following the function name declaration.

Accepted Answer

Using the `Param()` block inside the function body.

Answer

Reading from the `$env:PARAMS` environment variable.

Answer

Using the `Declare-Parameter` cmdlet within the script scope.

Answer

Using the `$args` automatic array explicitly in a `[CmdletBinding()]` block.

Question 4

A DevOps team uses a Python automation script to restart critical production services via a third-party REST API. During automated testing in the CI pipeline, the team wants to ensure the script's logic is tested without actually sending HTTP requests to the live production API. Which of the following is the BEST approach to achieve this?

Accepted Answer

Use the `unittest.mock` library to patch the HTTP request functions and return simulated API responses.

Answer

Wrap the API calls in a `try...except` block that catches `ConnectionError` and ignores it during CI execution.

Answer

Comment out the API calls in the script before committing to the repository.

Answer

Deploy a duplicate production environment and hardcode the script to point to the duplicate environment's IPs.

Question 5

A junior administrator has finished editing a Terraform configuration file locally and wants to save this snapshot of the work to their local Git repository history. However, they are not yet ready to share this code with the rest of the team. Which Git command accomplishes this?

Accepted Answer

git commit

Answer

git push

Answer

git fetch

Answer

git clone

Question 6

According to Semantic Versioning (SemVer) principles, an update to an automation module that introduces backwards-incompatible API changes requires incrementing the MINOR version number.

Accepted Answer

False

Answer

True

Question 7

A large enterprise uses a strict Git branching strategy for their infrastructure automation code. The team maintains a main branch representing production and a develop branch for integration.

During a weekend deployment, a critical bug is discovered in production that is causing automated database backups to fail. The development team is currently midway through building several new features in the develop branch.

Which workflow represents the correct strategy to address this issue while adhering to standard GitFlow principles?

Accepted Answer

Branch from `main` to create a `hotfix` branch. Fix the issue, merge the `hotfix` branch directly into `main`, and then merge the `hotfix` branch into `develop`.

Answer

Commit the fix directly to the `main` branch to resolve the issue as quickly as possible, then manually copy the changes into the `develop` branch.

Answer

Revert the previous commit on `main`, merge `develop` into `main`, and apply the fix on top of the newly merged code.

Answer

Create a `release` branch from `develop`, apply the fix there, merge the `release` branch to `main`, and delete `develop`.

Answer

Branch from `develop` to create a `bugfix` branch. Fix the issue, merge it back into `develop`, and then immediately merge `develop` into `main`.

Question 8

An automation team prefers a linear, clean commit history without 'merge commits' cluttering the repository. When a developer pulls changes from the remote tracking branch into their local feature branch, which Git command should they use to place their local commits on top of the remote commits?

Accepted Answer

git pull --rebase

Answer

git reset --hard

Answer

git checkout -b

Answer

git merge --squash

Question 9

A cloud architect is explaining the benefits of Infrastructure as Code (IaC) to a new team member. The architect highlights that running the same deployment script multiple times will yield the exact same environment state without creating duplicate resources or causing errors on subsequent runs. Which IaC principle is the architect describing?

Accepted Answer

Idempotency

Answer

Reusability

Answer

Orchestration

Answer

Immutability

Question 10

An organization mandates that server instances must never be modified in-place after they are provisioned. If an operating system patch is required, the automation pipeline must destroy the existing instances and deploy entirely new instances from an updated image. Which Infrastructure as Code (IaC) principle does this strictly enforce?

Accepted Answer

Immutability

Answer

Declarative State

Answer

Reusability

Answer

Idempotency

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