LCA Linux System Installation & Configuration 4

Question 1

Which command displays all currently mounted filesystems along with their mount options?

Accepted Answer

mount

Answer

Running 'mount' with no arguments prints all currently mounted filesystems, their mount points, types, and options.

Question 2

What is the role of the initramfs (initial RAM filesystem) during Linux boot?

Accepted Answer

Provides a temporary root filesystem to load drivers and mount the real root

Answer

The initramfs is a compressed cpio archive that provides a minimal temporary root filesystem, allowing the kernel to load necessary drivers before mounting the real root.

Question 3

Which LVM command extends a logical volume AND resizes its ext4 filesystem in one step?

Accepted Answer

lvextend -r -L +10G /dev/vg0/lv0

Answer

The -r flag with lvextend calls resize2fs automatically after extending the logical volume, handling both the LV and filesystem resize in one command.

Question 4

Which file defines system-wide environment variables applied at login on most Linux distributions?

Accepted Answer

/etc/environment

Answer

/etc/environment is a PAM-read file that sets system-wide environment variables for all sessions regardless of shell.

Question 5

What does the 'UUID=' syntax in /etc/fstab provide compared to using device names like /dev/sda1?

Accepted Answer

Stable identification that survives disk reordering

Answer

UUIDs uniquely identify filesystems regardless of which /dev/sdX name the kernel assigns, preventing boot failures when disk enumeration order changes.

(LCA) Certified Linux Administrator Practice Test

(LCA) Certified Linux Administrator Practice Test

LCA Linux System Installation & Configuration 4