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CompTIA XK0-006 Exam Syllabus Topics:

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

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CompTIA Linux+ Certification Exam Sample Questions (Q141-Q146):

NEW QUESTION # 141
A Linux administrator wants to add a user to the Docker group without changing the user's primary group.
Which of the following commands should the administrator use to complete this task?

Answer: C

Explanation:
User and group management is a core System Management topic in CompTIA Linux+ V8. When adding a user to an additional group-such as the docker group-care must be taken not to alter the user's primary group.
The correct command is sudo usermod -aG docker user. The -G option specifies a supplementary group, and the -a (append) option ensures the user is added to the group without removing existing group memberships. This is especially important because omitting -a would overwrite the user's supplementary groups.
Option B, usermod -g docker user, changes the user's primary group, which is not desired. Options A and D misuse groupmod, which is intended for modifying group properties, not user membership.
Linux+ V8 documentation explicitly warns that failing to use -a with -G can unintentionally remove a user from all other supplementary groups, potentially causing access issues.
Therefore, the correct and safe command is C. sudo usermod -aG docker user.


NEW QUESTION # 142
Which of the following commands is used to verify whether a port is open on a remote host?

Answer: B

Explanation:
The nc command can initiate a connection to a specific port on a remote host, making it useful for verifying whether that port is open and reachable over the network.


NEW QUESTION # 143
Following the completion of monthly server patching, a Linux administrator receives reports that a critical application is not functioning. Which of the following commands should help the administrator determine which packages were installed?

Answer: C

Explanation:
Package management troubleshooting is a critical Linux administration skill addressed in CompTIA Linux+ V8. After system patching, identifying which packages were installed, updated, or removed is often the first step in diagnosing application failures.
The dnf history command is specifically designed for this purpose. It displays a chronological list of all DNF transactions, including installations, upgrades, downgrades, and removals. Each transaction is assigned an ID and includes timestamps, affected packages, and actions taken. This allows administrators to correlate application failures with recent changes.
Option A is correct because it provides historical context rather than just current package state. Linux+ V8 documentation highlights dnf history as an essential auditing and rollback tool.
The other options are insufficient. dnf list shows installed or available packages but does not indicate when they were installed. dnf info displays metadata for a specific package but does not show transaction history.
dnf search is used to find packages by name or description.
By reviewing recent transactions with dnf history, administrators can quickly identify problematic updates and take corrective action, such as rolling back a package.
Therefore, the correct answer is A.


NEW QUESTION # 144
Which of the following formats is used to write an Ansible playbook?

Answer: B

Explanation:
Ansible playbooks are written in YAML, which provides a human-readable, structured format used to define plays, tasks, variables, and roles for automation.


NEW QUESTION # 145
Users report that a Linux system is unresponsive and simple commands take too long to complete. The Linux administrator logs in to the system and sees the following:

Which of the following is the system experiencing?

Answer: B

Explanation:
The load averages (8.71, 8.24, 7.71) are well above the number of CPUs (4), showing CPU saturation. Additionally, Output 2 indicates very high CPU usage (65.88% usr, 20.54% sys) with
0% idle, confirming the system is under heavy CPU load, which explains the unresponsiveness.


NEW QUESTION # 146
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