Free Practice Questions for CompTIA XK0-005 Exam

D is correct: The disk has hardware I/O errors. fsck should be run on an unmounted filesystem from a recovery environment.

Incorrect Options:

A: dd will copy bad blocks too; not safe here.

B: gddrescue is valid for data recovery, but not the most direct fix.

C: fsck in GRUB is unsafe if root is mounted.

Based on the output from one of the affected systems, the best explanation for the reported issue is that the virtual machine is running out of CPU resources, leading to users experiencing longer response times (D). The output shows that the system use percentage is very high (57.85%), indicating that the virtual machine is using most of its CPU cycles for system processes. This leaves little CPU time for user processes, which results in slower performance. The other explanations are not supported by the output or are contradictory. References:

[CompTIA Linux+ Study Guide], Chapter 8: Optimizing Linux Performance, Section: Monitoring CPU Usage

[How to Interpret CPU Usage Statistics]

LUKS stands for Linux Unified Key Setup, which is a specification for disk encryption on Linux systems. LUKS allows users to encrypt partitions or entire disks using a passphrase or a key file. LUKS also supports multiple keys and key slots, which can be used to unlock the encrypted data. LUKS is compatible with various tools and utilities, such as cryptsetup, dm-crypt, and LVM. References: [How to Encrypt Partitions with LUKS on Linux]

To prevent MySQL from crashing when swap space is exhausted:

Option C creates an additional swap file.

Option D adds an extra swap partition or enables existing one.

Option A adjusts the overcommit behavior to allow more allocation under low-memory conditions.

The /etc/skel directory (note: the correct spelling is skel, not ske1) contains default files and folders that are copied into a new user’s home directory when the account is created.

A is intended to be /etc/skel and is correct if the typo is fixed.

Corrected Question Should Use: A. /etc/skel

Incorrect Options:

B: Used for network/system configuration.

C: Contains SSH server configuration and keys.

D: A script run at system boot — unrelated to user home configuration.

-j enables bzip2 compression.

-c: create archive, -v: verbose, -f: filename.

C is correct syntax for creating a .tar.bz2 archive.

Incorrect Options:

A: Invalid extension and wrong flag combination.

B: -z uses gzip, not bzip2.

D: -b is for blocking factor, not compression.

umask subtracts permissions from default (666 for files, 777 for dirs).

To achieve 640 for files → umask = 137

To achieve 750 for dirs → umask = 027

The closest match to both for stricter permissions is umask 0037.

The setfacl -m u:Oliver:rwx /cloud_users command modifies the ACL (Access Control List) for the directory cloud_users, granting the user Oliver read, write, and execute permissions. This is the correct syntax for assigning specific permissions to a user.

The administrator has likely updated the SSH server to listen on a non-standard port (2222), but the firewall rules were not updated to allow connections on this new port. The firewall-cmd command with the --add-port option allows traffic on a specific port through the firewall. The command should be executed on myhost to permit incoming SSH connections on port 2222.

Step-by-Step Comprehensive Detailed Explanation:

Command Explanation:

B: Logging into the server's physical console provides direct root access.

D: The su command allows switching to the root user if the password is known.

Why Other Options are Incorrect:

A: Passwordless SSH login does not provide administrative access.

C: Telnet is insecure and typically disabled on hardened systems.

E: Installing sudo requires administrative privileges.

F: Adding a user to the wheel group requires administrative privileges.