LCA Linux System Installation & Configuration 5

Question 1

Which command creates a new ext4 filesystem on /dev/sdb1?

Accepted Answer

mkfs.ext4 /dev/sdb1

Answer

mkfs.ext4 is the standard command to create an ext4 filesystem; it is equivalent to mke2fs -t ext4.

Question 2

A sysadmin needs to add a second disk to an existing LVM volume group. Which sequence is correct?

Accepted Answer

pvcreate → vgextend → lvextend

Answer

You must first initialize the disk as a physical volume (pvcreate), then add it to the volume group (vgextend), then optionally extend logical volumes (lvextend).

Question 3

Which kernel parameter passed at boot disables SELinux for a single session?

Accepted Answer

selinux=0

Answer

Passing selinux=0 on the kernel command line completely disables SELinux for that boot session without permanently changing the policy configuration.

Question 4

Which configuration file sets the DNS resolver search domain and nameserver addresses on a traditional (non-NetworkManager) Linux system?

Accepted Answer

/etc/resolv.conf

Answer

/etc/resolv.conf contains 'nameserver' and 'search' directives that configure the system's DNS resolver library.

Question 5

What is the purpose of 'dracut' on Red Hat-based systems?

Accepted Answer

Generates the initramfs image

Answer

dracut is the tool used on Red Hat/Fedora systems to build the initramfs (initial RAM filesystem) image that the bootloader passes to the kernel.

(LCA) Certified Linux Administrator Practice Test

(LCA) Certified Linux Administrator Practice Test

LCA Linux System Installation & Configuration 5