2026 CompTIA XK0-006: CompTIA Linux+ Certification Exam–Valid New Exam Notes

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CompTIA XK0-006 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Services and User Management: Covers day-to-day Linux administration including file management, user accounts, processes, software, services, and container operations.
Topic 2
  • Security: Focuses on securing Linux systems through authentication, firewalls, OS hardening, account policies, cryptography, and compliance checks.
Topic 3
  • Troubleshooting: Addresses diagnosing and resolving issues across system health, hardware, storage, networking, security configurations, and performance optimization.
Topic 4
  • Automation, Orchestration, and Scripting: Covers task automation with tools like Ansible, shell and Python scripting, Git version control, and responsible AI-assisted development.

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CompTIA Linux+ Certification Exam Sample Questions (Q127-Q132):

NEW QUESTION # 127
Which of the following Ansible components contains a list of hosts and host groups?

Answer: D

Explanation:
In Ansible, the inventory defines the list of managed nodes (hosts) and groups of hosts. It is the source from which Ansible knows what systems to configure or manage.


NEW QUESTION # 128
A Linux administrator attempts to log in to a server over SSH as root and receives the following error message: Permission denied, please try again. The administrator is able to log in to the console of the server directly with root and confirms the password is correct. The administrator reviews the configuration of the SSH service and gets the following output:

Based on the above output, which of the following will most likely allow the administrator to log in over SSH to the server?

Answer: B

Explanation:
The SSH configuration option PermitRootLogin prohibit-password prevents the root user from logging in with password authentication. This setting means root cannot use a password to log in via SSH; only key- based authentication is permitted for root. The administrator can still log in as root locally, which is not affected by this SSH configuration. To allow SSH access as root, the administrator must use an SSH key instead of a password.
Other options:
* A. MaxSessions controls the number of simultaneous SSH sessions but is not causing the login denial here.
* B. PAM (Pluggable Authentication Modules) is disabled, but enabling it is not required for basic SSH authentication.
* C. Changing the SSH port is unrelated to the authentication method issue.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: "Securing Linux", Section: "Securing SSH Access" CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security


NEW QUESTION # 129
A systems administrator wants to update and apply changes in an existing file in a remote Git repository.
Which of the following is the last Git command the administrator should execute to complete this process?

Answer: A

Explanation:
Git workflows are a core component of the Automation and Orchestration domain in CompTIA Linux+ V8.
When working with remote repositories, administrators follow a standard lifecycle to move changes from a local environment to the shared remote server.
The complete process typically involves:
* git pull: Retrieving and merging the latest changes from the remote to ensure the local copy is up to date.
* git add: Staging the modified files.
* git commit: Saving the changes to the local repository history with a descriptive message.
* git push: Transmitting the local commits to the remote repository.
In this scenario, the question asks for the last command required to complete the process of updating the remote repository. While git commit (Option A) saves the changes locally, those changes are not available to other team members or the remote server until they are pushed. Therefore, git push origin update-feature is the final step that synchronizes the local branch with the remote repository.
Option B (checkout -b) is used at the beginning of the process to create a new branch. Option C (pull) is also performed early to avoid conflicts.
The verified answer is git push, as it is the definitive concluding action in the Git synchronization workflow.


NEW QUESTION # 130
A Linux administrator needs to change the server name to comptia1. Which of the following commands should the administrator use?

Answer: C

Explanation:
The standard tool for managing the system hostname on modern Linux distributions using systemd is hostnamectl. According to the CompTIA Linux+ V8 objectives, the command hostnamectl set-hostname < name > is the correct and permanent way to change the server ' s identity.
When an administrator runs hostnamectl set-hostname comptia1, the utility updates the various types of hostnames recognized by the system:
* Static Hostname: This is stored in /etc/hostname and persists across reboots.
* Transient Hostname: A temporary name received via network configuration (like DHCP).
* Pretty Hostname: A high-level, human-readable name that can include special characters.
Using hostnamectl is preferred over manually editing /etc/hostname because it immediately notifies the kernel and running services of the change, often without requiring a reboot to take effect system-wide.
The other options are incorrect. Option A, export HOSTNAME=comptia1, only changes the environment variable for the current shell session; it does not change the system ' s actual hostname and is lost when the session ends. Option B, adding the name to /etc/resolv.conf, is incorrect because that file is used for DNS resolver settings (nameservers and search domains), not for the local system ' s hostname. Option D, systemctl daemon-reload, is used to refresh systemd after configuration changes to unit files and has no functionality for changing a hostname.
Therefore, hostnamectl is the verified command for this task.


NEW QUESTION # 131
A Linux administrator receives reports about MySQL service availability issues. The administrator observes the following information:

Which of the following explains why the server was offline?

Answer: D

Explanation:
The logs show mysqld invoked oom-killer, which is the Linux Out-Of-Memory (OOM) killer. This indicates MySQL consumed too much memory, forcing the kernel to terminate it to protect the system, which caused the service outage.


NEW QUESTION # 132
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