XK0-005 Practice Test 35 — 15 Questions

Question 1

A developer writes a Python script that uses the `requests` library to fetch data from an API. The script works on the developer's workstation but fails on the server with an import error. What is the most likely cause?

Accepted Answer

The `requests` module is not installed on the server. The `requests` library is a third-party Python package that must be installed separately via `pip` or a package manager. The script works on the developer's workstation because `requests` is present there, but fails on the server with an import error, indicating the module is missing from the server's Python environment. This is the most likely cause because an import error specifically points to a missing module, not to network or syntax issues.

Answer

The script uses an incorrect API endpoint

Answer

The server lacks internet connectivity

Answer

The script has a syntax error in the import statement

Question 2

A junior administrator is writing a bash script that should exit immediately if any command in a pipeline fails. Which command should be added at the beginning of the script?

Accepted Answer

set -o pipefail. Option D is correct because `set -o pipefail` ensures that if any command in a pipeline fails (returns a non-zero exit status), the entire pipeline is considered to have failed, and with `set -e` (which is often used alongside it), the script will exit immediately. This is specifically required by the question: 'exit immediately if any command in a pipeline fails.' Without `pipefail`, only the exit status of the last command in the pipeline is considered, so earlier failures would be ignored.

Answer

set -u

Answer

shopt -s extglob

Answer

set -e

Question 3

Refer to the exhibit. An administrator creates this systemd unit file for a backup script. When the administrator runs `systemctl start backup.service`, the script runs but the service shows 'inactive (dead)' immediately. What change should be made to keep the service active until the script finishes?

Accepted Answer

Add 'RemainAfterExit=yes' to the [Service] section. The correct answer is A because adding 'RemainAfterExit=yes' to the [Service] section tells systemd to consider the service as active even after the main process (the backup script) exits. Without this directive, systemd sees the process terminate and immediately marks the service as 'inactive (dead)', even though the script may still be running or its effects are ongoing. This is the standard way to keep a service unit in an 'active' state after the main command completes.

Answer

Change the service type to 'forking'

Answer

Add 'ExecStop' to the service definition

Answer

Change the service type to 'simple'

Question 4

A script receives a JSON object where keys are user IDs. Which command extracts the 'status' of user id '123'?

Accepted Answer

echo "$json" | jq '.["123"].status'. Option D is correct because the JSON object uses user IDs as keys, so `.["123"]` directly accesses the object property for user ID '123', and `.status` extracts the 'status' field from that nested object. The `jq` syntax `.["key"]` is the standard way to access a property by a string key in a JSON object.

Answer

echo "$json" | jq '.status'

Answer

echo "$json" | jq '. | select(.id=="123") | .status'

Answer

echo "$json" | jq '.[] | select(.id=="123") | .status'

Question 5

An administrator wants to ensure that a web service starts after the database service has fully initialized. Which TWO methods can be used to achieve this ordering dependency in systemd?

Accepted Answer

Add Requires=db.service in the [Unit] section. Option A is correct because `Requires=db.service` in the `[Unit]` section declares a strong dependency: if `db.service` fails to start, `web.service` will not be started. Option B is correct because `After=db.service` in the `[Unit]` section of `web.service` ensures that `web.service` starts only after `db.service` has reached the 'active' state, enforcing the required ordering. Together, these two directives guarantee both dependency and sequencing.

Answer

Add BindsTo=db.service in the [Unit] section

Answer

Add Wants=db.service in the [Unit] section

Answer

Add PartOf=db.service in the [Unit] section

Question 6

An Ansible playbook includes the following task: 'ansible.builtin.service: name=nginx state=restarted'. However, the playbook fails with 'module not found'. What is the most likely cause?

Accepted Answer

The module name uses the wrong FQCN. The correct module is 'ansible.builtin.systemd_service'.. The error 'module not found' indicates that Ansible cannot locate the module specified in the task. The correct fully qualified collection name (FQCN) for the service module in the `ansible.builtin` collection is `ansible.builtin.service`, not `ansible.builtin.systemd_service`. The `systemd_service` module does not exist in the `ansible.builtin` collection; the correct module for managing systemd services is `ansible.builtin.systemd`, but the standard service module (`ansible.builtin.service`) works across init systems and is the appropriate choice here.

Answer

The playbook is not in the correct directory.

Answer

The target host does not have nginx installed.

Answer

The control node does not have Python installed.

Question 7

A systems administrator needs to automate the execution of a backup script every day at 2:00 AM using a systemd service. Which unit type should the administrator create?

Accepted Answer

A .timer unit. A .timer unit is the correct choice because systemd timers are designed to schedule and trigger the execution of other units (such as services) at specific times or intervals. By creating a .timer unit that activates at 2:00 AM daily and a corresponding .service unit for the backup script, the administrator can automate the backup using systemd's built-in scheduling mechanism, which is more reliable and integrated than cron for systemd-managed systems.

Answer

A .service unit

Answer

A .path unit

Answer

A .mount unit

Question 8

Which command is used to convert a file to uppercase?

Accepted Answer

All of the above. Option B is correct because all three commands (A, C, D) are valid ways to convert lowercase letters to uppercase using the `tr` command. Each uses a different syntax—character ranges, POSIX character classes, or bracket expressions—but all achieve the same result. The question asks which command is used, and since all options work, 'All of the above' is the correct answer.

Answer

tr '[a-z]' '[A-Z]'

Answer

tr [:lower:] [:upper:]

Answer

tr a-z A-Z

Question 9

A system administrator needs to run a script every 15 minutes. Which systemd unit type is used to schedule this?

Accepted Answer

systemd timer. Systemd timers are the native systemd unit type for scheduling tasks at specified intervals, such as every 15 minutes. They replace traditional cron jobs in systemd-based Linux distributions and are defined with a .timer unit file that triggers a corresponding .service unit. This makes option A correct because the question explicitly asks for the systemd unit type used for scheduling.

Answer

at job

Answer

anacron

Answer

cron job

Question 10

An Ansible playbook fails with a syntax error. Which command validates the playbook syntax without running it?

Accepted Answer

ansible-playbook --syntax-check. The `--syntax-check` flag is a built-in option of `ansible-playbook` that parses the YAML file and validates its syntax without executing any tasks. This is the correct tool for catching syntax errors in a playbook before running it.

Answer

ansible-lint playbook.yml

Answer

ansible-playbook --check

Answer

ansible-playbook --validate

Question 11

Refer to the exhibit. The development team is using Git to manage their project. A release candidate needs to include only the changes from the `feature/update` branch, but NOT the 'Add new module' commit. Which Git command sequence should be used to create a new release branch that contains only the feature branch?

Accepted Answer

git checkout -b release 1m2n3o4 && git cherry-pick 4d5e6f7 8f9g0h1. Option B is correct because it creates a new release branch starting from the commit before the 'Add new module' commit (1m2n3o4), then cherry-picks only the two commits from the `feature/update` branch (4d5e6f7 and 8f9g0h1) that represent the desired changes. This ensures the release branch contains exactly the feature branch changes without including the unwanted 'Add new module' commit.

Answer

git checkout feature/update && git rebase 1m2n3o4

Answer

git checkout -b release master && git revert 2j3k4l5

Answer

git checkout -b release feature/update && git merge --no-ff master

Question 12

A systems administrator writes a Bash script named 'backup.sh' and wants it to run with the Bash shell. Which line should appear first in the script?

Accepted Answer

#!/bin/bash. The shebang line `#!/bin/bash` is required as the first line to instruct the operating system to execute the script using the Bash shell interpreter located at `/bin/bash`. Without this line, the script may be run by a different shell (e.g., `/bin/sh`), leading to syntax or behavior differences. The shebang must start with `#!` followed by the absolute path to the interpreter.

Answer

# This is a bash script

Answer

#/bin/bash

Answer

#!/bin/sh

Question 13

An administrator needs to run a script '/usr/local/bin/cleanup.sh' every day at 2:30 AM. Which crontab entry is correct?

Accepted Answer

30 2 * * * /usr/local/bin/cleanup.sh. The correct crontab syntax is `minute hour day month weekday command`. Option D specifies minute 30, hour 2, and asterisks for all other fields, which means the script runs at 2:30 AM every day. This matches the requirement exactly.

Answer

2 30 * * * /usr/local/bin/cleanup.sh

Answer

*/30 2 * * * /usr/local/bin/cleanup.sh

Answer

30 * * * * /usr/local/bin/cleanup.sh

Question 14

Refer to the exhibit. A backup script fails every 5 minutes. Which is the most likely cause?

Accepted Answer

The backup script lacks write permission to the destination directory or file.

Answer

The mount point /mnt/backup is not accessible.

Answer

The cron job is running too frequently, causing a race condition.

Answer

The backup script is not executable.

Question 15

Refer to the exhibit. An administrator attempts to mount all filesystems and receives an error. What is the most likely cause?

Accepted Answer

The /var directory has been deleted or is missing.

Answer

The /var entry has a wrong filesystem type.

Answer

The UUID for /var is incorrect in fstab.

Answer

The /var filesystem is corrupted.