FreeBSD Operating System

Упражнение 1:

Номер 1

What is a horizontal flyback concerning TVs and monitors??

Ответ:

(1) Deflecting the electron beam from the right hand side of the screen to the left

(2) Deflecting the electron beam from the left hand side of the screen to the right

(3) Scanning the screen from left to right

(4) Scanning the screen from right to left

Номер 2

What is a vertical flyback concerning TVs and monitors??

Ответ:

(1) Deflecting the electron beam from the top of the screen to the bottom

(2) Deflecting the electron beam from the bottom of the screen to the top

(3) Scanning the screen from top to bottom

(4) Scanning the screen from bottom to top

Номер 3

What is an interlacing concerning TVs and monitors?

Ответ:

(1) Displaying the frame in one vertical scan

(2) Displaying the frame in one horizontal scan

(3) Displaying the odd and even frames in two alternating half frames, which doubles the apparent vertical frequency

(4) Displaying the odd and even frames in two alternating half frames, which doubles the apparent horizontal frequency

Упражнение 2:

Номер 1

How is the brief pause between the end of the line and the start of the sync pulse called?

Ответ:

(1) vertical flyback

(2) horizontal flyback

(3) front porch

(4) back porch

Номер 2

How is the brief puase between the end of the sync pulse and the beginning of the data called?

Ответ:

(1) vertical flyback

(2) horizontal flyback

(3) front porch

(4) back porch

Номер 3

How is the process of ensuring, that the flyback is invisible, called?

Ответ:

(1) interlacing

(2) blanking

(3) deflection

(4) frame

Упражнение 3:

Номер 1

Which of the dispay controller (CRTC) registers specifies how many dots on each line?

Ответ:

(1) The Horizontal Total register

(2) The End Horizontal Retrace register

(3) The Start Horizontal Retrace register

(4) The Horizontal Display End register

Номер 2

Which of the dispay controller (CRTC) registers specifies how many dot clock pulses occur before the sync pulse starts?

Ответ:

(1) The Horizontal Total register

(2) The End Horizontal Retrace register

(3) The Start Horizontal Retrace register

(4) The Horizontal Display End register

Номер 3

Which of the dispay controller (CRTC) registers defines the total number of dot clocks per line?

Ответ:

(1) The Horizontal Total register

(2) The End Horizontal Retrace register

(3) The Start Horizontal Retrace register

(4) The Horizontal Display End register

Упражнение 4:

Номер 1

Which of the sections in XF86Config file contains the path to the RGB database file, which should never need to be changed, and the default font path?

Ответ:

(1) The ServerLayout section

(2) The ServerFlags section

(3) The Files section

(4) The Module section

Номер 2

Which of the sections in XF86Config file describes binary modules that the server loads?

Ответ:

(1) The ServerLayout section

(2) The ServerFlags section

(3) The Files section

(4) The Module section

Номер 3

Which of the sections in XF86Config file describes the relationships between the individual hardware components under the control of an X server?

Ответ:

(1) The ServerLayout section

(2) The ServerFlags section

(3) The Files section

(4) The Module section

Упражнение 5:

Номер 1

What are the functions of the swapper while starting the system?

Ответ:

(1) It is responsible for starting up the system and daemons

(2) Starts after the probing

(3) Locates the kernel, the file /boot/kernel/kernel on the root file system

(4) It is responsible for emergency clearing of memory when the standard virtual memory algorithms aren’t fast enough

Номер 2

What are the functions of the loader while starting the system?

Ответ:

(1) Locates the kernel, the file /boot/kernel/kernel on the root file system

(2) Loads the kernel into memory

(3) When coming up in the default multi-user mode, it spawns a shell to execute the shell script /etc/rc

(4) Starts after the probing

Номер 3

What are the functions of the init while starting the system?

Ответ:

(1) It is responsible for emergency clearing of memory when the standard virtual memory algorithms aren’t fast enough

(2) Loads the kernel into memory

(3) It is responsible for starting up the system and daemons

(4) When coming up in the default multi-user mode, it spawns a shell to execute the shell script /etc/rc

Упражнение 6:

Номер 1

What is false about the shell script /etc/rc, used in the process of running the kernel?

Ответ:

(1) It starts virtual disk drivers

(2) It mounts swap space

(3) It checks the file system integrity if necessary

(4) It starts processes

Номер 2

What does the program fsck do in the process of running the kernel?

Ответ:

(1) It examines the virtual memory

(2) It examines the hardware configuration of the machine

(3) It examines the file system

(4) It examines all processes in the system

Номер 3

What is the aim of the operation, called probing, in the process of running the kernel?

Ответ:

(1) To examine the virtual memory

(2) To examine the hardware configuration of the machine

(3) To examine the file system

(4) To examine all processes in the system

Упражнение 7:

Номер 1

What is false about sharing system files between multiple machines?

Ответ:

(1) Any changeable data specific to a system can be shared

(2) Installing ports will install ports for all systems

(3) If you share /boot and make some configuration changes, the options will apply to all systems

(4) One way to handle the information like the system name is to have a separate /etc directory for each system

Номер 2

What is false about sharing system files between multiple machines?

Ответ:

(1) You should mount shared resources read-only

(2) If you have two systems both installing software in the same directory, you can have conflicts

(3) When building system software, you can use the same /usr/src and /usr/obj directories as long as all systems maintain the same release of FreeBSD

(4) You can't have different kernels for the machines, sharing system files

Номер 3

What is false about sharing system files between multiple machines?

Ответ:

(1) Sharing system files between multiple machines helps you to run the machines diskless

(2) Installing ports will install ports for all systems

(3) One way to handle the information like the system name is to have a separate /etc directory for each system

(4) When building system software, you can't use the same /usr/src and /usr/obj directories

Упражнение 8:

Номер 1

What is false about PicoBSD as an alternative to network booting?

Ответ:

(1) It is a special small version of FreeBSD

(2) It doean't require a fair amount of memory as RAM disk

(3) It fits on a single floppy disk

(4) PicoBSD is good for some special applications

Номер 2

What is false about booting from CD-R or CD-ROM as an alternative to network booting?

Ответ:

(1) It’s impossible to run programs directly from the CD

(2) In this case, you can have up to 700 MB of data, enough for a number of applications

(3) The most likely application for this alternative is for systems where the reliability of rotating media is insufficient

(4) The CD can be used only for booting, and after that the system runs from RAM disk

Номер 3

What is false about booting from Flash memory as an alternative to network booting?

Ответ:

(1) Flash is available in sizes up to several hundred megabytes

(2) They don’t fit IDE connectors

(3) It is much slower to read than to write

(4) Flash memory is intended mainly for reading

Упражнение 9:

Номер 1

What is false about file /etc/rc.conf?

Ответ:

(1) It defines the configuration of the system

(2) Nearly all site-dependent information is stored here

(3) It appears when you install the system whithout aid of any other utilities

(4) It says, what the system needs to do when it starts up

Номер 2

What is false about file /etc/rc.conf?

Ответ:

(1) The definitions in /etc/rc.conf override the defaults in /etc/defaults/rc.conf

(2) When the system starts, it first reads file /etc/rc.conf and then /etc/defaults/rc.conf

(3) In older releases of FreeBSD, this file was called /etc/sysconfig

(4) It is createed, usually with the aid of sysinstall

Номер 3

What is false about file /etc/defaults/rc.conf?

Ответ:

(1) Commands at the end of this file check for the existence of the file /etc/rc.conf and read it in if they find it

(2) File /etc/defaults/rc.conf contains default values for everything you might put in /etc/rc.conf

(3) When the system starts, it first reads /etc/defaults/rc.conf

(4) Nearly all site-dependent information is stored here

Упражнение 10:

Номер 1

On which kernel security level IP packet filter rules can not be changed and dummynet configuration can not be adjusted?

Ответ:

(1) Insecure mode

(2) Secure mode

(3) Highly secure mode

(4) Network secure mode

Номер 2

On which kernel security level the immutable and append-only flags may not be turned off and disks for mounted filesystems, /dev/mem and /dev/kmem may not be opened for writing?

Ответ:

(1) Insecure mode

(2) Secure mode

(3) Highly secure mode

(4) Network secure mode

Номер 3

On which kernel security level the immutable and append-only flags may be turned off and all devices may be read or written subject to their permissions?

Ответ:

(1) Insecure mode

(2) Secure mode

(3) Highly secure mode

(4) Network secure mode

Упражнение 11:

Номер 1

Which of the files contains a list of file systems known to the system?

Ответ:

(1) /etc/group

(2) /etc/namedb/named.conf

(3) /etc/fstab

(4) /etc/exports

Номер 2

Which of the files contains a list of file systems that should be NFS exported?

Ответ:

(1) /etc/group

(2) /etc/namedb/named.conf

(3) /etc/fstab

(4) /etc/exports

Номер 3

Which of the files defines the groups known to the system?

Ответ:

(1) /etc/group

(2) /etc/namedb/named.conf

(3) /etc/fstab

(4) /etc/exports

Упражнение 12:

Номер 1

Which of the files contains a list of networks in the Internet?

Ответ:

(1) /etc/protocols

(2) /etc/manpath.config

(3) /etc/netconfig

(4) /etc/networks

Номер 2

Which of the files contains a list of known protocols that run on the IP layer?

Ответ:

(1) /etc/protocols

(2) /etc/manpath.config

(3) /etc/netconfig

(4) /etc/networks

Номер 3

Which of the files is a machine-readable form of the user database with the passwords removed?

Ответ:

(1) /etc/gettytab

(2) /etc/pwd.db

(3) /etc/netconfig

(4) /etc/passwd

FreeBSD Operating System - тест 30