LCA Backup & Disaster Recovery 5

Question 1

What does 'bare metal recovery' refer to in disaster recovery?

Accepted Answer

Restoring a complete system to new or wiped hardware with no prior OS installed

Answer

Bare metal recovery restores an entire system image (OS, applications, and data) onto hardware that has no existing operating system.

Question 2

Which tool is specifically designed for bare metal backup and recovery on Linux systems by creating bootable rescue media?

Accepted Answer

Relax-and-Recover (ReaR)

Answer

ReaR (Relax-and-Recover) creates system configuration backups and bootable rescue media enabling complete bare metal disaster recovery on Linux.

Question 3

A differential backup strategy is used. Sunday is a full backup; Tuesday's differential is corrupt. Which backups are needed to restore to Wednesday?

Accepted Answer

Sunday full + Wednesday differential

Answer

Differential backups always include all changes since the last full backup, so Wednesday's differential plus Sunday's full backup is sufficient regardless of Tuesday.

Question 4

What is the function of the '--link-dest' option in rsync?

Accepted Answer

Create hard links to unchanged files from a previous backup, saving disk space

Answer

--link-dest causes rsync to hard-link files that are unchanged from a reference directory, enabling space-efficient snapshot-style backups.

Question 5

Which command verifies the integrity of an ext4 filesystem and is typically run only when the filesystem is unmounted?

Accepted Answer

fsck.ext4

Answer

fsck.ext4 checks and repairs an ext4 filesystem for errors; it must be run on an unmounted filesystem to avoid data corruption.

(LCA) Certified Linux Administrator Practice Test

(LCA) Certified Linux Administrator Practice Test

LCA Backup & Disaster Recovery 5