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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam (XK0-006) |
| Exam Number: | XK0-006 |
| Exam Duration: | 90 minutes |
| Exam Format: | Performance-based questions (PBQs), Multiple-choice questions |
| Related Certifications: | CompTIA Security+ CompTIA A+ CompTIA Network+ |
| Exam Price: | Approximately USD 358 (varies by region) |
| Passing Score: | 720 (on a scale of 100โ900) |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Real Exam Qty: | Maximum 90 |
| Recommended Training: | CompTIA CertMaster Learn (Linux+ XK0-006) CompTIA Official Training Resources |
| Exam Registration: | Pearson VUE Exam Registration CompTIA Linux+ Official Certification Page |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online (proctored) or onsite testing via Pearson VUE centers |
| Pre Condition: | No mandatory prerequisites, but 12โ24 months of Linux administration experience or CompTIA A+ / Network+ knowledge is recommended. |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 143
A systems administrator is configuring new Linux systems and needs to enable passwordless authentication between two of the servers. Which of the following commands should the administrator use?
Answer: B
Explanation:
This command generates an SSH key pair and securely copies the public key to the remote server, enabling passwordless authentication by allowing key-based SSH login between the systems.
NEW QUESTION # 144
Users cannot access a server after it has been restarted. At the server console, the administrator runs the following commands:
Which of the following is the cause of the issue?
Answer: A
Explanation:
The server is running and responding to pings, and DNS resolves correctly (dig server1 โ192.168.0.2). The ss -lnt output shows SSH (port 22) is listening, but the firewall (firewall-cmd -- list-all) does not list SSH among the allowed services. Therefore, external users cannot connect because the firewall is blocking SSH.
NEW QUESTION # 145
A Linux administrator needs to create accounts for a list of new users. The user account names have been defined in the USER_LIST variable by executing the following:
USER_LIST= " alice bob charles "
Which of the following commands should the administrator use to successfully create the user accounts?
Answer: C
Explanation:
The correct answer is D. for username in $USER_LIST; do useradd -m " $username " ; done because it correctly iterates through each value in the USER_LIST variable and executes the useradd command for each user. In Bash scripting, a for loop is the most appropriate and commonly used construct for iterating over a list of space-separated values stored in a variable.
The variable USER_LIST= " alice bob charles " contains three usernames separated by spaces. When used in a for loop, Bash automatically splits the string into individual words, assigning each value to the variable username during each iteration. The useradd -m command then creates a new user account and also generates a home directory for each user, which is standard practice in Linux system administration.
Option A is incorrect because the syntax is invalid; a while loop requires a conditional expression or a read statement to process input, which is missing here. Option B is also incorrect because until loops require a condition and are not suitable for iterating over lists in this way. Option C is incorrect because the select statement is used for interactive menu-based selection, not for non-interactive batch processing, and quoting
$USER_LIST would treat the entire string as a single item.
From a Linux+ perspective, understanding shell scripting constructs such as loops is essential for automation and user management tasks. The for loop provides a simple and efficient way to perform repetitive administrative operations, such as creating multiple user accounts, ensuring consistency and saving time in system provisioning.
NEW QUESTION # 146
A Linux administrator installed a new program inside $HOME/.local/bin and is trying to execute it without using an absolute path. Which of the following should the administrator use for this task?
Answer: A
Explanation:
The correct answer is C. export PATH=$PATH:$HOME/.local/bin because it correctly appends the directory
$HOME/.local/bin to the existing PATH environment variable. The PATH variable defines a list of directories that the shell searches when a user enters a command without specifying its full path. By adding a directory to PATH, executables within that directory can be run directly from the command line.
In this case, the administrator installed a program in $HOME/.local/bin, which is not always included in the default PATH for all systems or users. By using export PATH=$PATH:$HOME/.local/bin, the existing PATH is preserved and extended to include the new directory. The use of $PATH ensures that previously defined directories remain accessible, while the colon (:) separates multiple directory entries.
Option A is incorrect because it literally assigns the string "PATH" instead of referencing the current PATH variable, effectively breaking command lookup.
Option B and D are incorrect because they attempt to assign a value to $PATH, which is invalid syntax.
Environment variables should be assigned using their name (PATH), not with a dollar sign.
From a Linux+ perspective, managing environment variables is a fundamental skill in user and system configuration. Properly configuring the PATH variable ensures efficient command execution and usability, especially when installing custom or user-specific applications. For persistence, this change is typically added to shell configuration files like ~/.bashrc or ~/.profile.
NEW QUESTION # 147
An administrator wants to see all logs for the app.service systemd process. Which of the following commands should the administrator use to complete this task?
Answer: C
Explanation:
The correct answer is D. journalctl -u app.service because journalctl is the primary tool used to query and display logs collected by systemd's journal service (journald). The -u option specifically filters logs related to a particular systemd unit, such as app.service. This allows administrators to view all log entries generated by that service, making it the most precise and efficient command for troubleshooting service-related issues.
In modern Linux systems that use systemd, logs are centralized and managed by journald rather than being scattered across multiple log files. Using journalctl -u app.service provides a complete view of the service's lifecycle, including startup messages, errors, warnings, and runtime activity. Additional options like -f (follow logs in real time) or --since can further refine log analysis.
Option A (cat /var/log/messages) is incorrect because it displays general system logs and is not specific to a particular service. Additionally, not all distributions or services log to this file when using systemd. Option B (systemctl status app.service) is partially useful but incorrect because it only shows a brief summary of the service status along with a limited number of recent log entries, not the full log history. Option C (systemd- analyze unit-files app.service) is incorrect because it is used for analyzing unit files and system boot performance, not for viewing logs.
Within Linux+ objectives, the ability to use journalctl effectively is a key troubleshooting skill. It allows administrators to diagnose service failures, monitor behavior, and identify errors quickly. Filtering logs by unit ensures targeted analysis, which is critical in complex systems running multiple services simultaneously.
NEW QUESTION # 148
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