201-450 | A Review Of Verified 201-450 practice test

Question No: 4

What is the functionality that PXE provides?

A. The ability to boot a computer using its network interface.

B. The ability to launch an remote X11 desktop on a computer.

C. The ability to verify a system's configuration after completing the boot process.

D. The ability to verify a system's configuration before completing the boot process.

Answer: A

Question No: 5

In the following output, what percentage of time was the CPU waiting for pending I/O?

# vmstat 1 100

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----

r b swpd free buff cache si so bi bo in cs us sy id wa

0 0 0 282120 134108 5797012 0 0 0 2 0 0 0 0 100 0

0 0 0 282120 134108 5797012 0 0 0 0 1007 359 0 0 100 0

0 0 0 282120 134108 5797012 0 0 0 0 1117 577 0 0 100 0

0 0 0 282120 134108 5797012 0 0 0 0 1007 366 0 0 100 0

A. 0

B. 100

C. 35.9

D. 57.7

E. 36.6

Answer: A

Question No: 6

A system with SysV-init has a service installed called apache2. Which file controls the start and stop of this service and is referenced by the various runlevel directories?

A. /etc/init.d/apache2

B. /etc/rc2.d/70apache2

C. /etc/rc2.d/apache2

D. /etc/rc2.d/apache2.start

Answer: A

Question No: 7

Which of the following tools are used to measure memory usage? (Choose THREE correct answers.)

A. mpstat

B. pstree

C. sar

D. top

E. vmstat

Answer: CDE

Question No: 8

Which archive format is used to create an initramfs image?

A. gzip

B. tar

C. RAR

D. cpio

E. bzip2

Answer: D

Question No: 9

A database application requires a maximum shared memory segment (shmmax) of 2GB (2147483648 Bytes). Which configuration file should be modified to set this kernel parameter permanently? (Specify the full name of the file, including path.)

Answer:

/etc/sysctl.conf

Question No: 10

Which command is used to create a ISO9660 filesystem? (Specify ONLY the command without any path or parameters.)

Answer:

mkisofs, genisoimage

Question No: 11

How can the label root be added to the ext2 filesystem on /dev/sda1?

A. relabel /dev/sda1 root

B. tune2fs -L root /dev/sda1

C. echo 'root' > /proc/fs/sda1/label

D. labelfs --device /dev/sda1 root

Answer: B

Question No: 12

Consider the following /etc/fstab file:

/dev/hda1 swap swap defaults 0 0

/dev/hda2 / ext2 defaults 1 1

/dev/hda3 /home ext2 defaults 1 2

none /proc proc defaults 0 0

/dev/sdb1 /media/usb0 vfat user,noauto 0 0

What is one of the possible commands that an ordinary (non-root) user can use to mount the /dev/sdb1 partition on the /media/usb0 mount point? (Please enter the command with all parameters and/or options but without any file system type options.)

Answer:

mount /dev/sdb1, mount /media/usb0, /bin/mount /dev/sdb1, /bin/mount /media/usb0, mount /media/usb0/,

/bin/mount /media/usb0/

Question No: 13

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

A. Because if problems with the root file system are detected during the boot, fsck can be run, without risk of damage.

B. Because this way crackers cannot collect information about root with boot sniffers.

C. To avoid writing to the disk, unless the root password is known.

D. To avoid other operating systems overwriting the Linux root partition.

E. Because the disk has its own write protection that cannot be changed by the operating system.

Answer: A