Why is the root file system mounted read-only during boot and remounted with write permission later on?

Because if problems with the root file system are detected during the boot, fsck can be run, without risk of damage.
Because this way crackers cannot collect information about root with boot sniffers.
To avoid writing to the disk, unless the root password is known.
To avoid other operating systems overwriting the Linux root partition.
Because the disk has its own write protection that cannot be changed by the operating system.

Answer(s): A

What happens if the Linux kernel can't mount the root filesystem when booting?

An error message is shown and the administrator is asked by the kernel to specify a valid root filesystem to continue the boot process.
An error message is shown and the system reboots after a keypress.
An error message is shown and the system boots in maintenance mode.
An error message is shown showing which device couldn't be mounted or informing that init couldn't be found.
An error message is shown stating that the corresponding kernel module couldn't be loaded.

Answer(s): D

What are the main network services used by the PXE protocol? (Choose TWO correct answers.)

Answer(s): B,D

In case the file containing the Linux kernel is lost, what happens when the system is booting?

The system starts normally since the bootloader copies the kernel to the master boot record of the hard disk.
Instead of the kernel, the initramfs is loaded and instructed to mount the root filesystem and reinstall the kernel from the original package or from source.
The bootloader mounts the root filesystem read-only and launches /bin/sh directly in order to allow the administrator to reinstall the kernel.
Without a kernel a system cannot boot and, depending on the bootloader, an error is displayed.

Answer(s): D

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