LPIC-2 Linux Kernel and System Startup Practice Test 4 — 15 Questions

Question 1

Match each Linux filesystem feature to its description.

Accepted Answer

ext4: A journaling filesystem that is the default for many Linux distributions, supporting extents and large files.. The correct matches are ext4 (default journaling filesystem), XFS (high-performance parallel I/O), Btrfs (copy-on-write with snapshots), and F2FS (flash-friendly). Common confusions include swapping ext4 with Btrfs and XFS with F2FS.

Answer

ext4: A copy-on-write filesystem with built-in snapshot and compression capabilities.

Answer

XFS: A flash-friendly filesystem designed for NAND flash storage, minimizing write amplification.

Question 2

During boot, the kernel panics because the root filesystem cannot be mounted. Which kernel parameter should be added at the GRUB prompt to try an alternative root device?

Accepted Answer

root=/dev/sdb1. The kernel parameter 'root=' specifies the device for the root filesystem. When the default root device fails to mount, adding 'root=/dev/sdb1' at the GRUB prompt overrides the compiled-in root and tells the kernel to attempt mounting from that alternative block device. This is the standard method to redirect the root mount during boot troubleshooting.

Answer

init=/bin/sh

Answer

rescue

Answer

single

Question 3

An administrator wants to compile a new kernel module that is not yet in the tree. What file should be referenced to ensure the module is built with the same configuration as the current kernel?

Accepted Answer

/boot/config-5.10.0-9-amd64. /boot/config-5.10.0-9-amd64 contains the exact kernel configuration used to build the currently running kernel. When compiling a new kernel module, referencing this file (typically via 'make oldconfig' or copying it to the source tree as .config) ensures the module is built with the same set of options, such as enabled features, drivers, and module parameters, preventing incompatibilities.

Answer

/proc/config.gz

Answer

/boot/System.map-5.10.0-9-amd64

Answer

/boot/initrd.img-5.10.0-9-amd64

Question 4

Which file is used by GRUB2 to load the kernel and initramfs?

Accepted Answer

/boot/grub/grub.cfg. GRUB2 uses /boot/grub/grub.cfg as its main configuration file, which contains the menu entries, kernel paths, and initramfs locations. This file is generated by update-grub (or grub-mkconfig) based on scripts in /etc/grub.d/ and settings in /etc/default/grub, and it is read directly by the GRUB2 bootloader at boot time to load the kernel and initramfs.

Answer

/etc/lilo.conf

Answer

/etc/default/grub

Answer

/boot/grub/menu.lst

Question 5

An administrator wants to ensure a kernel module is loaded automatically at boot for a hardware device. Which file should be modified to add the module name?

Accepted Answer

/etc/modules-load.d/. The `/etc/modules-load.d/` directory contains configuration files that list kernel module names to be loaded automatically at boot by the `systemd-modules-load.service`. This is the standard mechanism in modern Linux distributions using systemd to ensure specific modules are loaded early in the boot process, before udev or other services handle device detection.

Answer

/etc/modprobe.d/blacklist.conf

Answer

/etc/udev/rules.d/

Answer

/proc/sys/kernel/

Question 6

After upgrading the kernel on a Red Hat Enterprise Linux system, the system fails to boot because the initramfs is missing. Which command can be used to regenerate the initramfs?

Accepted Answer

dracut -f. On Red Hat Enterprise Linux (RHEL) systems, the `dracut` utility is the standard tool for creating and regenerating initial RAM filesystem images (initramfs). The `-f` (force) option overwrites an existing initramfs file, which is necessary after a kernel upgrade to ensure the new kernel has the correct drivers and modules to mount the root filesystem during boot. Without a valid initramfs, the kernel cannot access the root filesystem, causing a boot failure.

Answer

mkinitrd -f

Answer

grub2-mkconfig -o /boot/grub2/grub.cfg

Answer

mkinitramfs -o /boot/initrd.img

Question 7

An administrator wants to disable the graphical splash screen during boot. What change should be made in /etc/default/grub?

Accepted Answer

Remove 'splash' from GRUB_CMDLINE_LINUX_DEFAULT. The graphical splash screen during boot is controlled by the 'splash' kernel parameter. Removing 'splash' from GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub disables the splash screen, allowing verbose boot messages to be displayed. This parameter is passed to the kernel via the bootloader, and its absence prevents the plymouth or similar splash service from activating.

Answer

Set GRUB_CMDLINE_LINUX="nosplash"

Answer

Remove 'quiet' from GRUB_CMDLINE_LINUX_DEFAULT

Answer

Set GRUB_TIMEOUT=0

Question 8

A system has multiple kernels installed. Which command shows the version of the currently booted kernel?

Accepted Answer

uname -r. The `uname -r` command specifically displays the kernel release (version) of the currently running operating system. It reads this information directly from the `/proc/sys/kernel/osrelease` virtual file, which is populated by the kernel at boot time. This makes it the most direct and reliable method to identify the active kernel version.

Answer

rpm -qa | grep kernel

Answer

cat /proc/version

Answer

ls /boot

Question 9

Which two utilities can be used to load kernel modules? (Choose two.)

Accepted Answer

modprobe. modprobe is correct because it is the primary utility for loading kernel modules, including handling module dependencies automatically by consulting the modules.dep file generated by depmod. insmod is also correct because it directly inserts a single module into the kernel, though it does not resolve dependencies automatically.

Answer

modinfo

Answer

lsmod

Answer

depmod

Question 10

Which three directories or files are typically associated with the Linux kernel? (Choose three.)

Accepted Answer

/proc. /proc is a virtual filesystem that provides an interface to kernel data structures, exposing process information, system hardware details, and runtime kernel parameters. It is dynamically generated by the kernel and does not occupy disk space, making it a direct representation of kernel state.

Answer

/dev

Answer

/etc

Question 11

A user reports that an external USB hard drive is not detected when plugged in. The system uses a standard kernel with USB support. What is the most likely reason?

Accepted Answer

The usb_storage module is blacklisted.. The most likely reason is that the `usb_storage` module is blacklisted, which prevents the kernel from loading the driver needed to detect USB mass storage devices. Even though the kernel has USB support compiled in or as a module, a blacklist entry in `/etc/modprobe.d/` or `/etc/modprobe.conf` explicitly blocks the module from loading, causing the drive to appear undetected. This is a common troubleshooting scenario where all other USB functionality works, but storage devices fail.

Answer

The USB driver is not installed.

Answer

The external drive is incompatible.

Answer

The kernel lacks USB support.

Question 12

During boot, a server's video driver causes a freeze. At the GRUB2 menu, the administrator needs to interactively add the kernel parameter 'nomodeset' to the boot entry. Which key should be pressed to access the kernel command line editor?

Accepted Answer

e. Pressing 'e' at the GRUB2 menu enters the edit mode for the selected boot entry, allowing the administrator to modify kernel parameters interactively. This is the standard GRUB2 keybinding to access the kernel command line editor, where 'nomodeset' can be added to the 'linux' line to disable kernel mode-setting and prevent the video driver from freezing during boot.

Answer

a

Answer

Tab

Answer

c

Question 13

An organization is migrating from SysV init to systemd. What systemd command should be used to check the status of the HTTP service?

Accepted Answer

systemctl status httpd. The correct command to check the status of a service in systemd is `systemctl status httpd`. This command displays the current state, recent log entries, and process details for the specified unit. The `systemctl` utility is the primary interface for managing systemd services, while `systemd` itself is the init system daemon, not a user-facing command.

Answer

systemd-analyze httpd

Answer

systemctl list-units httpd

Answer

systemd status httpd

Question 14

A new network card driver module is not being loaded at boot. The administrator wants to ensure the module is loaded automatically without modifying the kernel command line. Which file should be used?

Accepted Answer

/etc/modules-load.d/.conf. /etc/modules-load.d/.conf is the standard configuration directory used by systemd-modules-load.service to load kernel modules at boot without modifying the kernel command line. Files in this directory list module names (one per line) that are loaded automatically during early boot, making it the proper mechanism for ensuring a network card driver module is loaded.

Answer

/lib/modules/$(uname -r)/modules.builtin

Answer

/etc/modprobe.d/<name>.conf

Answer

/etc/rc.local

Question 15

After creating a new partition table on /dev/sda, what command should be run to install GRUB2 to the Master Boot Record?

Accepted Answer

grub-install /dev/sda. After creating a new partition table on /dev/sda, the Master Boot Record (MBR) resides on the disk device itself, not on a partition. The `grub-install /dev/sda` command installs GRUB2's boot code into the MBR (first 440 bytes) and embeds the core image in the post-MBR gap. This makes the disk bootable by the BIOS.

Answer

grub-mkconfig -o /boot/grub/grub.cfg

Answer

update-grub

Answer

grub-install /dev/sda1