Chapter 3

Question 1

What is an IRQ? pg 112

Answer 1

is a hardware signal sent to the processor that temporarily stops a running program and allows a special program, an interrupt handler, to run instead. Interrupts are used to handle such events as data receipt from a modem or network, key presses or mouse movements, and operating system timer requests to switch from process execution into kernel mode.

Question 2

HAL Daemon Hardware Abstraction Layer(HAL) Daemon (hald) pg 120

Answer 2

is a user space program that runs at all times(that is a daemon) and provides other user-space programs with information about available hardware.

Question 3

D-Bus Desktop Bus pg 120

Answer 3

mechanism that allows communication between multiple computer programs (that is, processes) concurrently running on the same machine.[3] D-Bus was designed as part of the effort of the freedesktop.org project to standardize services provided by Linux desktop environments such as GNOME and KDE.

Question 4

udev pg 120

Answer 4

is a device manager for the Linux kernel. As the successor of devfsd and hotplug, udev primarily manages device nodes in the /dev directory

Question 5

table 3.3 pg 121

-v

Answer 5

Increases verbosity of output.

Question 6

-n

Answer 6

Displays information in numeric codes rather than translating the codes to manufacture and devices.

Question 7

-nn

Answer 7

Displays both the manufacturer and device names and their associated numeric codes.

Question 8

– version do??

Answer 8

Displays version information

Question 9

How can you back up your MBR partitions in linux?

Answer 9

sfdisk -d /dev/sda >sda-backup.txt

Question 10

How can you restore the back up?

Answer 10

sfdisk -f /dev/sda

Question 11

what is Ext2fs (Second Extended File System)

Answer 11

is the traditional Linux Native file system.

Question 12

what is Ext3fs?

Answer 12

is the same as Ext2fs with a journal added.

Question 13

how do you extract a file in linux?

Answer 13

write internal-file external-file

Question 14

what is the most important linux disk partition

Answer 14

root(/) partition which is at the base of the linux tree.

Question 15

Explain how file systems are mounted in linux?

Answer 15

The mount command ties a file system to a Linux directory; once the file system is mounted, its files can be accessed as part of the mount directory. The /etc/fstab file describes permanent mappings of file systems to mount points; when the systems boots it automatically mounts the describe file systems unless they use the noauto option (which is common for removable disks)