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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting | 22% | - System and hardware issues
|
| Topic 2: Services and User Management | 20% | - Service configuration and operation
|
| Topic 3: Automation and Scripting | 17% | - Shell scripting and automation
|
| Topic 4: Security | 18% | - Access control and authentication
|
| Topic 5: System Management | 23% | - Installation, configuration, and maintenance
|
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NEW QUESTION # 184
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 as follows:
USER_LIST= " alice bob charles "
Which of the following commands should the administrator use to successfully create the user accounts?
Answer: C
Explanation:
Automating user creation is a frequent administrative task. In shell scripting, when you have a space- separated list of items stored in a variable, the for loop is the most efficient way to iterate through them.
According to CompTIA Linux+ V8, the syntax for < variable > in < list > ; do < commands > ; done allows the shell to split the list by whitespace and assign each item to the variable sequentially.
In the command for username in $USER_LIST; do useradd -m " $username " ; done:
* The shell expands $USER_LIST into alice, bob, and charles.
* In the first iteration, username is set to alice, and useradd -m " alice " is executed.
* The process repeats for bob and then charles.
* The -m flag ensures a home directory is created for each user, which is a best practice.
The other options are syntactically incorrect or unsuitable. Options A and B attempt to use while and until with echo, but they lack the read command required to actually assign the piped input to the username variable (e.g., while read username). Option C (select) is used for creating interactive menus for users to choose from, not for automated batch processing.
Therefore, the for loop is the verified and standard method for this task in a Linux environment.
NEW QUESTION # 185
Which of the following allows modules to be used in Python scripts?
Answer: C
Explanation:
This statement makes functions, classes, and variables from a module available for use within a Python script, enabling modular and reusable code.
NEW QUESTION # 186
An administrator receives the following output while attempting to unmount a filesystem:
umount /data1: target is busy.
Which of the following commands should the administrator run next to determine why the filesystem is busy?
Answer: C
Explanation:
Filesystem unmount failures are common troubleshooting scenarios covered in Linux+ V8. When the error
"target is busy" appears, it means one or more processes are actively using files or directories within the mount point.
The correct diagnostic command is lsof | grep /data1. The lsof (list open files) utility displays all open files and the processes using them. Filtering the output with grep /data1 identifies exactly which processes are holding file descriptors on the filesystem, preventing it from being unmounted.
The other options are incorrect. ps -f displays process information but does not show open file usage. du -sh calculates disk usage and does not identify active processes. top monitors system performance but cannot pinpoint filesystem locks.
Linux+ V8 documentation emphasizes using lsof or fuser to identify resource locks before unmounting filesystems. Therefore, the correct answer is D.
NEW QUESTION # 187
A Linux administrator needs to securely erase the contents of a hard disk. Which of the following commands is the best for this task?
Answer: B
Explanation:
The shred command securely erases data by overwriting the specified device or file multiple times, making recovery nearly impossible. This is the best option for securely erasing a hard disk.
NEW QUESTION # 188
A Linux administrator just finished setting up passwordless SSH authentication between two nodes. However, upon test validation, the remote host prompts for a password. Given the following logs:
Which of the following is the most likely cause of the issue?
Answer: D
Explanation:
This issue is directly related to SELinux enforcement, which is a key topic in the Security domain of CompTIA Linux+ V8. The logs clearly indicate that SSH key-based authentication is failing due to an SELinux access control violation rather than a traditional file permission or SSH configuration problem.
The most important clue is the AVC denial message, which shows that the sshd process is being denied read access to the authorized_keys file. The security context of the file is listed as unconfined_u:object_r:
home_root_t:s0. Under a targeted SELinux policy, SSH is only permitted to read authorized_keys files that are labeled with the correct SELinux type, typically ssh_home_t.
Because SELinux is running in enforcing mode, it actively blocks access that violates policy rules, even if standard UNIX permissions are correct. Although the file permissions (600) are acceptable for an authorized_keys file, SELinux does not rely solely on traditional permissions. The mismatch between the expected SELinux context and the actual context prevents sshd from accessing the file, causing SSH to fall back to password authentication.
Option D correctly identifies the root cause: the authorized_keys file does not have the correct SELinux security context. This is a well-documented Linux+ V8 troubleshooting scenario, commonly resolved by restoring the correct context using commands such as restorecon or by ensuring the file resides in a properly labeled home directory.
The other options are incorrect. Restarting sshd does not fix SELinux labeling issues. The policy itself is functioning as intended, and file ownership alone does not override SELinux access controls.
Linux+ V8 documentation emphasizes that SELinux denials must be addressed by correcting file contexts rather than weakening security controls. Therefore, the correct answer is D.
NEW QUESTION # 189
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