CompTIA Linux+ XK0-006 Practice Questions and
Answers 2026
Preboot Execution Environment (PXE) First step (optional). A technology that allows a computer to start up over a
network connection rather than booting from its internal storage, like a hard drive
or SSD.
Bootloader Second step (if PXE is involved). Loads the OS and prepares the system using the
kernal
Initial RAM Disk (initred) Third step. A temporary root files system that is loaded into memory before the
real root filesystem is mounted.
Kernal Last step. Core of Operating system that manages hardware, processes, memory,
and system resources
How PXE works 1. Network card activates boot process
2. a DHCP request is sent to a DHCP server
3. The DHCP server provides the location of a TFTP server
4. The necessary boot files are transferred from the TFTP server
5. The bootloader is executed using the files from the TFTP server.
grub2 (GRand Unified Bootloader Version 2).
Grub2 process 1. Firmware hands control to GRUB2
2. GRUB2 displays boot menu
3. GRUB2 reads configuration of selected kernal.
4. GRUB2 loads and initrd and kernal
True or False: initrd is loaded at the same time as the True
kernal
BIOS Basic Input Output System. Firmware that initializes hardware prior to the
bootloader.
sysctl Use this command to view or set kernel parameters at runtime. Use this command
to troubleshoot CPU issues by retrieving CPU-based kernel parameters at
runtime.
How can you make your kernal parameter modifications By modifying the etc/sysctl.conf file
permanent?
System Directories Used to manage core functionalities such as booting, interacting with devices,
sharing libraries, and processing information
1/7
, File Hierarchy Standard (FHS) Defines how files and directories are organized to maintain consistency across
FHS-compliant Linux distributions
/root Top level directory from which all other directories branch out, everything in the
system is accessible from this directory
/boot Boot loader files. Contains all files required to boot Linux
/bin Essential User Binaries. Stores critical programs required for basic system
functionality like "ls" and "cat"
/sbin System Binaries. Similar to /bin but contains administrative commands primarily
used by the root user
/lib Shared Libraries and Kernal Modules. Provides essential libraries required by the
programs in /bin and /sbin.
/dev Device files. Contains special files that represent hardware devices. These files
allow programs to interact with hardware as if they were normal files
/proc Process and System Information Directory. Virtual file system that can provide
real-time system information
/etc Configuration Files. Stores system-wide configuration files that determine how the
system and applications behave
/home Contains personal files, settings, and data for each user on the system.
/usr User Programs and Application Data Directory. Contains system-wide user-
installed programs, libraries, and documentation.
/var Variable Data Directory. Holds variable files, which are files that change
frequently such as system logs, cache, and databases.
/tmp Temporary Files Directory. Used for storing temporary files created by
applications as users work within them.
CPU Architecture Design of a CPU and how that design affects how the machine processes data
x86 An older 32-bit CPU design developed by Intel, processing data in chunks of 32-
bits or 4 bytes at a time.
x86_64 (AMD64) A 64-bit extension of ___ , introduced by AMD in 1999 and later adopted by Intel.
AArch64 (ARM64) A 64-bit version of ARM processors, designed for power, efficiency, and
scalability. Commonly used in mobile devices.
RISC-V (5) Reduced Instruction Set Computing 5th Iteration. An open-source CPU design
that allows companies and developers to customize processors for their specific
needs.
2/7
Answers 2026
Preboot Execution Environment (PXE) First step (optional). A technology that allows a computer to start up over a
network connection rather than booting from its internal storage, like a hard drive
or SSD.
Bootloader Second step (if PXE is involved). Loads the OS and prepares the system using the
kernal
Initial RAM Disk (initred) Third step. A temporary root files system that is loaded into memory before the
real root filesystem is mounted.
Kernal Last step. Core of Operating system that manages hardware, processes, memory,
and system resources
How PXE works 1. Network card activates boot process
2. a DHCP request is sent to a DHCP server
3. The DHCP server provides the location of a TFTP server
4. The necessary boot files are transferred from the TFTP server
5. The bootloader is executed using the files from the TFTP server.
grub2 (GRand Unified Bootloader Version 2).
Grub2 process 1. Firmware hands control to GRUB2
2. GRUB2 displays boot menu
3. GRUB2 reads configuration of selected kernal.
4. GRUB2 loads and initrd and kernal
True or False: initrd is loaded at the same time as the True
kernal
BIOS Basic Input Output System. Firmware that initializes hardware prior to the
bootloader.
sysctl Use this command to view or set kernel parameters at runtime. Use this command
to troubleshoot CPU issues by retrieving CPU-based kernel parameters at
runtime.
How can you make your kernal parameter modifications By modifying the etc/sysctl.conf file
permanent?
System Directories Used to manage core functionalities such as booting, interacting with devices,
sharing libraries, and processing information
1/7
, File Hierarchy Standard (FHS) Defines how files and directories are organized to maintain consistency across
FHS-compliant Linux distributions
/root Top level directory from which all other directories branch out, everything in the
system is accessible from this directory
/boot Boot loader files. Contains all files required to boot Linux
/bin Essential User Binaries. Stores critical programs required for basic system
functionality like "ls" and "cat"
/sbin System Binaries. Similar to /bin but contains administrative commands primarily
used by the root user
/lib Shared Libraries and Kernal Modules. Provides essential libraries required by the
programs in /bin and /sbin.
/dev Device files. Contains special files that represent hardware devices. These files
allow programs to interact with hardware as if they were normal files
/proc Process and System Information Directory. Virtual file system that can provide
real-time system information
/etc Configuration Files. Stores system-wide configuration files that determine how the
system and applications behave
/home Contains personal files, settings, and data for each user on the system.
/usr User Programs and Application Data Directory. Contains system-wide user-
installed programs, libraries, and documentation.
/var Variable Data Directory. Holds variable files, which are files that change
frequently such as system logs, cache, and databases.
/tmp Temporary Files Directory. Used for storing temporary files created by
applications as users work within them.
CPU Architecture Design of a CPU and how that design affects how the machine processes data
x86 An older 32-bit CPU design developed by Intel, processing data in chunks of 32-
bits or 4 bytes at a time.
x86_64 (AMD64) A 64-bit extension of ___ , introduced by AMD in 1999 and later adopted by Intel.
AArch64 (ARM64) A 64-bit version of ARM processors, designed for power, efficiency, and
scalability. Commonly used in mobile devices.
RISC-V (5) Reduced Instruction Set Computing 5th Iteration. An open-source CPU design
that allows companies and developers to customize processors for their specific
needs.
2/7
