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CompTIA XK0-006 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Troubleshooting: Addresses diagnosing and resolving issues across system health, hardware, storage, networking, security configurations, and performance optimization.
Topic 2
  • Services and User Management: Covers day-to-day Linux administration including file management, user accounts, processes, software, services, and container operations.
Topic 3
  • Security: Focuses on securing Linux systems through authentication, firewalls, OS hardening, account policies, cryptography, and compliance checks.
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 (Q85-Q90):

NEW QUESTION # 85
You are a systems administrator and have created an uncompressed backup of the application directory. Several hours later, you must restore the application from backup.
INSTRUCTIONS
Within each tab, click on an object to form the appropriate command used to create the backup and restore the application.
Command objects may only be used once, and not all will be used. Click the arrow to remove any unwanted objects from your command.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Answer:

Explanation:
see the solution in Explanation below.
Explanation:


This performance-based question tests correct use of the tar utility for backup and restore operations, which is part of System Management in CompTIA Linux+ V8. The key detail is that the backup is explicitly described as uncompressed, so the correct archive file must be a plain .tar file rather than .tar.gz, .tgz, or .tar.bz2.
For the backup command, the correct syntax is:
tar -cvf /backups/application.tar -C /opt/ application
Here, -c creates the archive, -v enables verbose output, and -f specifies the archive filename. The -C /opt/ option changes to the /opt/ directory before archiving, and application is then archived relative to that location. This is the correct Linux+ method because it avoids storing unnecessary leading path components in the archive.
For the restore command, the correct syntax is:
tar -xvf /backups/application.tar -C /opt/
Here, -x extracts the archive, -v displays files being restored, and -f identifies the archive file. The -C /opt/ option ensures the archived application directory is restored back into /opt/, recreating /opt/application correctly.
The other file choices such as /backups/application.tar.gz, /backups/application.tgz, and /backups/application.
tar.bz2 are incorrect because they indicate compressed backups, which the question specifically rules out.
Likewise, options such as -xzvf or -xjvf are used for gzip- or bzip2-compressed archives and would not apply here.
Therefore, the verified correct PBQ answers are:
Backup: tar -cvf /backups/application.tar -C /opt/ application
Restore: tar -xvf /backups/application.tar -C /opt/


NEW QUESTION # 86
An administrator needs to append the output of a Linux command to an existing file for later analysis. Which of the following command-line strings should the administrator use?

Answer: C

Explanation:
The correct answer is D. ls > > file.txt because the > > (double greater-than) operator is specifically used in Linux to append output to an existing file without overwriting its current contents. This is a fundamental concept in shell redirection and is widely used in scripting and automation tasks.
In this command, ls generates a list of directory contents, and > > file.txt ensures that this output is added to the end of the file. If the file does not exist, it will be created automatically. If it does exist, the existing content remains intact, and the new output is appended below it.
Option A (cat ls > file.txt) is incorrect because cat ls attempts to read a file named "ls," not execute the ls command. Additionally, > would overwrite the file instead of appending.
Option B (tee ls > awk file.txt) is invalid syntax and does not correctly use tee or redirection. The tee command is used to write output to both stdout and a file, but this example is malformed.
Option C (echo ls | sed -i file.txt) is incorrect because it does not execute the ls command; it simply echoes the string "ls" and attempts to modify a file using sed improperly.
From a Linux+ perspective, understanding redirection operators ( > , > > , |) is essential for automation and scripting. The > > operator is especially important when logging outputs, collecting command results, or building reports over time without losing previous data.


NEW QUESTION # 87
A Linux systems administrator makes updates to systemd-managed service configuration files. Which of the following commands should the administrator execute in order to implement the changes?

Answer: D

Explanation:
In the systemd architecture, service configurations are stored in unit files (e.g., .service, .timer, .mount) located in directories like /etc/systemd/system/ or /usr/lib/systemd/system/. When an administrator modifies these files or creates new ones, the systemd manager does not automatically detect the changes. According to the CompTIA Linux+ V8 curriculum, the command systemctl daemon-reload is required to notify systemd that it needs to rescan the configuration directories and rebuild its internal dependency tree.
Without running daemon-reload, attempting to start or restart the service would result in systemd using the old, cached version of the unit file, or it might generate a warning stating that " the unit file on disk has changed. " This command is a safe operation that does not stop running services; it simply refreshes the manager ' s awareness of the current configuration.
The other options are insufficient for " implementing the changes " to the configuration files themselves.
systemctl enable (Option A) creates the links for starting the service at boot. systemctl start (Option B) attempts to launch the service. systemctl restart (Option C) stops and then starts a service, but if the unit file was changed and daemon-reload was not run, it may fail or use outdated settings.
Thus, systemctl daemon-reload is the essential first step after any modification to a systemd unit file.


NEW QUESTION # 88
Which of the following can reduce the attack surface area in relation to Linux hardening?

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Reducing the attack surface area in Linux hardening refers to limiting possible points of unauthorized access.
According to the CompTIA Linux+ Official Study Guide (Exam XK0-006), enforcing strong password policies is a critical aspect of security hardening. This practice ensures that user accounts are protected by passwords that are difficult to guess or crack, thus minimizing the risk of successful brute-force attacks.
Implementing password complexity requirements (such as minimum length, use of uppercase, lowercase, numbers, and special characters) directly addresses one of the primary vectors for unauthorized access.
Other options do not have a direct impact on reducing the attack surface:
A). Customizing the log-in banner serves as a legal notification and does not affect system vulnerabilities.
B). Reducing the number of directories created is not related to hardening or access control.
C). Extending the SSH startup timeout period may give attackers more time to attempt a connection and does not increase security.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: " Securing the System " , Section: " Implementing Password Policies " CompTIA Linux+ XK0-006 Exam Objectives, Domain 3.0: Security


NEW QUESTION # 89
Which of the following describes what Ansible is used for in the context of IT Infrastructure?

Answer: C

Explanation:
Ansible is used for configuration management, allowing administrators to automate the provisioning, configuration, and management of systems and services across an IT infrastructure.


NEW QUESTION # 90
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