Boot Process

Question 1

Linux Boot Process

Answer 1

The sequence of steps a computer follows to start up

Question 2

4 main boot components

Answer 2

Preboot Execution Environment

Boot Loader

Initial RAM Disk (initrd)

Kernel

Question 3

Preboot Execution Environment (PXE)

Answer 3

Optional, used for remote booting

Question 4

Bootloader

Answer 4

Loads the OS and prepares the system

Question 5

Initial RAM Disk (initrd)

Answer 5

Provides essential drivers and tools before switching to the
real root filesystem

Question 6

Kernel

Answer 6

The core of the OS, managing system resources

Question 7

What is PXE’s role?

Answer 7

Enables network-based booting instead of local storage
(HDD/SSD)

Used for deploying operating systems remotely in businesses, schools, and data centers

Question 8

PXE Boot Process

Answer 8

The network card requests an IP address from a DHCP server

○ DHCP provides the location of a TFTP server storing boot files

○ PXE retrieves the bootloader, such as GRUB2, to load the OS installer or system image

Question 9

What is Bootloader’s role?

Answer 9

Loads the Linux kernel and initrd

Interacts with the firmware (BIOS or UEFI) to initialize the boot process

Can display a boot menu if multiple OS versions are available

Question 10

_________ reads boot entries from /boot/grub/grub.cfg

Answer 10

Bootloader

Question 11

Bootloader’s configurations are modified in __________ updated using ___________

Answer 11

/etc/default/grub, update-grub

Question 12

What is the Kernel’s role?

Answer 12

The core of the operating system
Manages hardware, processes, memory, and system resources
Mounts the root filesystem and starts system services

             Configurations are adjusted using sysctl
	
         Persistent kernel parameters are stored in /etc/sysctl.conf
             
 Changes can be applied immediately with sysctl -p