FreeBSD Operating System

Упражнение 1:

Номер 1

What group of permissions can't be set for the file in Unix system?

Ответ:

(1) read

(2) write

(3) execute

(4) delete

Номер 2

For whom permissions to access the file can't be set in Unix system?

Ответ:

(1) the file owner

(2) the file group

(3) the logged in user

(4) other users

Номер 3

What does the first symbol in file permission note for?

Ответ:

(1) permissions, set for the file owner

(2) permissions, set for the currently logged in user

(3) permissions, set for all users of the system

(4) a kind of the file

Упражнение 2:

Номер 1

Which of the symbols shows that the permission for the file is not granted?

Ответ:

(1) x

(2) r

(3) w

(4) hypen (-)

Номер 2

Which of the symbols shows that the permission to write is granted?

Ответ:

(1) x

(2) r

(3) w

(4) hypen (-)

Номер 3

Which of the symbols shows that the permission to execute is granted?

Ответ:

(1) x

(2) r

(3) w

(4) hypen (-)

Упражнение 3:

Номер 1

What does the link count of the file note for?

Ответ:

(1) a number of links to the file

(2) a number of hard links to the file

(3) a number of symbolic links to the file

(4) unique identifier of the file

Номер 2

What is the value of link count for a regular file normally?

Ответ:

(1) 1

(2) 2

(3) 0

(4) 4

Номер 3

What is the value of link count for a directory?

Ответ:

(1) at least 1

(2) at least 2

(3) at least 3

(4) 0

Упражнение 4:

Номер 1

What does the command "chown" do?

Ответ:

(1) changes only the file owner

(2) changes only the file group

(3) changes only permissions

(4) changes both the file owner and the file group

Номер 2

What does the command "chmod" do?

Ответ:

(1) changes only the file owner

(2) changes only the file group

(3) changes only permissions

(4) changes both the file owner and the file group

Номер 3

What does the command "chgroup" do?

Ответ:

(1) changes only the file owner

(2) changes only the file group

(3) changes only permissions

(4) changes both the file owner and the file group

Упражнение 5:

Номер 1

What permissions will be set by the command "chmod go-w file"?

Ответ:

(1) Write permissions will be denied to group and owner

(2) Write permissions will be denied to group and others

(3) Write permissions will be added to group and owner

(4) Write permissions will be added to group and others

Номер 2

What permissions will be set by the command "chmod g=u-w file"?

Ответ:

(1) Set the group bits equal to the user bits, but clear the group write bit

(2) Set the group bits equal to the user bits, but set the group write bit

(3) Set the user bits equal to the group bits, but clear the group write bit

(4) Set the user bits equal to the group bits, but set the group write bit

Номер 3

What permissions will be set by the command "chmod go= file"?

Ответ:

(1) Clear all mode bits for group and owner

(2) Clear all mode bits for group and others

(3) Set all mode bits for group and owner

(4) Set all mode bits for group and others

Упражнение 6:

Номер 1

Which of the following shell commands specifies permission bits not to allow?

Ответ:

(1) setuid

(2) setgid

(3) ps

(4) umask

Номер 2

Which of the following shell commands specifies the access permissions of the process to run as if it had been started by its owner?

Ответ:

(1) setuid

(2) setgid

(3) ps

(4) umask

Номер 3

Which of the following shell commands specifies the access permissions of the process to run as if it had been started by its group?

Ответ:

(1) setuid

(2) setgid

(3) ps

(4) umask

Упражнение 7:

Номер 1

What is false about (hard) links?

Ответ:

(1) Links are restricted to the same file system

(2) Files can have more than one link

(3) The inode contains a link count

(4) If you delete the file, which has been hard linked you can't access the file by other names

Номер 2

What is false about symbolic (soft) links?

Ответ:

(1) symbolic links refer to another file names

(2) Files can have more than one symbolic links

(3) Symbolic links are restricted to the same file system

(4) If you delete a file name, that has a symbolic link pointing to it, the symbolic link can't find it any more

Номер 3

What is false about inodes?

Ответ:

(1) Inodes have names

(2) Inodes don't have any data

(3) Inodes can't be accessed directly

(4) Inodes contain the metadata - all the information about the file

Упражнение 8:

Номер 1

What is false about snapshots?

Ответ:

(1) Snapshorts are a method to create a unified view of a file system

(2) You can have unlimited number of snapshots on a file system

(3) Snapshots have the schg flag set, which prevents anybody writing to them

(4) You can mount snapshots with the md driver

Номер 2

What is false about snapshots?

Ответ:

(1) You can't remove snapshots

(2) When you access snapshot, you get a view of the file system as it was at the time of the snapshot

(3) You can have multiple snapshots on a file system

(4) Snapshots are authomatically updated when anything is written to the file system

Номер 3

What is false about snapshots?

Ответ:

(1) At the time of waiting, snapshots are still under development

(2) You can remove snapshots

(3) You can have multiple snapshots on a file system

(4) When you access the snapshot you get the current data for the parts of the disk which have changed

Упражнение 9:

Номер 1

What is false about formatting a disk in FreeBSD?

Ответ:

(1) If you need to format a SCSI disk, use camcontrol

(2) Before formatting the disk it is necessary to back up data you want to keep

(3) FreeBSD can format floppies

(4) Formatting the disk is useful if you are having configuration problems

Номер 2

What is false about formatting a disk in FreeBSD?

Ответ:

(1) Formatting the disk destroys all data on the disk

(2) Camcontrol is a control program for SCSI devices in FreeBSD

(3) It is possible to reformat ATA (IDE) disks in FreeBSD system

(4) Formatting the disk is useful if you want to change the physical sector size of the disk

Номер 3

What is false about formatting a disk in FreeBSD?

Ответ:

(1) FreeBSD can format SCSI disks

(2) Camcontrol is a control program for floppies in FreeBSD

(3) Formatting the disk is useful if you are getting "medium fomat corrupted" errors from the disk in response to read and write requests

(4) Formatting the disk destroys all data on the disk

Упражнение 10:

Номер 1

Which of Vinum objects is a virtual disk, having no size limitations?

Ответ:

(1) plex

(2) subdisk

(3) volume

(4) drive

Номер 2

Which of Vinum objects can be compared with individual disks in a mirrored array, each containing the same data?

Ответ:

(1) plexes

(2) subdisks

(3) volumes

(4) drives

Номер 3

Which of Vinum objects is used as building block for plexes?

Ответ:

(1) volume

(2) drive

(3) subdisk

(4) virtual disk

Упражнение 11:

Номер 1

What is false about the method of concatenated plexes?

Ответ:

(1) Disk storage is a number of data sectors that are addressable by numbers

(2) The method works well when the access to the virtual disk is concentrated on a small area

(3) Virtual disk is divided into groups of consecutive sactors

(4) The size of sectors is equal to the size of the individual physical disks

Номер 2

What is false about the method of striped plexes?

Ответ:

(1) All stripes are stored on the one device

(2) All stripes are equal-sized

(3) The address space is divided into smaller components, called stripes

(4) The method can cause additional I/O load

Номер 3

What is false about mirroring?

Ответ:

(1) It is a form of redundant data storage, aimed at surviving hardware failure

(2) It is also known as RAID-5

(3) It requires twice as much disk storage as a non-redundant solution

(4) It maintains two or more copies of the data on different physical hardware

Упражнение 12:

Номер 1

Which method of plex organization can contain any number of subdisks of different length?

Ответ:

(1) concatenated plexes

(2) RAID-0 plexes

(3) RAID-5 plexes

(4) RAID-4 plexes

Номер 2

Which method of plex organization offers the advantage of fault tolerance and needs a minimum of three subdisks?

Ответ:

(1) concatenated plexes

(2) RAID-0 plexes

(3) RAID-5 plexes

(4) RAID-4 plexes

Номер 3

Which method of plex organization needs at least two subdisks of the same size?

Ответ:

(1) concatenated plexes

(2) RAID-0 plexes

(3) RAID-5 plexes

(4) RAID-4 plexes

FreeBSD Operating System - тест 12