39756066
Descripción
Test por David OkOk, actualizado hace 12 meses
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Creado por David OkOk
hace alrededor de 2 años
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Pregunta 1
Pregunta
Which type of file system is created by mkfs when it is executed with the block device name only and without any additional parameters?
Respuesta
-
XFS
-
VFAT
-
ext2
-
ext3
-
ext4
Pregunta 2
Pregunta
Which umask value ensures that new directories can be read, written and listed by their owning user, read and listed by their owning group and are not accessible at all for everyone else?
Respuesta
-
0750
-
0027
-
0036
-
7640
-
0029
Pregunta 3
Pregunta
Which of the following commands changes the number of days before the ext3 filesystem on /dev/sda1 has to run through a full filesystem check while booting?
Respuesta
-
tune2fs -d 200 /dev/sda1
-
tune2fs -i 200 /dev/sda1
-
tune2fs -c 200 /dev/sda1
-
tune2fs -n 200 /dev/sda1
-
tune2fs --days 200 /dev/sda1
Pregunta 4
Pregunta
Which is the default percentage of reserved space for the root user on new ext4 filesystems?
Respuesta
-
10%
-
3%
-
15%
-
0%
-
5%
Pregunta 5
Pregunta
5.- Which of the following is true when a file system, which is neither listed in /etc/fstab nor known to system, is mounted manually?
Respuesta
-
Systemd ignores any manual mounts which are not done using the systemctl mount command
-
The command systemctl mountsync can be used to create a mount unit based on the existing mount
-
systemd automatically generates a mount unit and monitors the mount point without changing it
-
Unless a systemd mount unit is created, systemd unmounts the file system after a short period of time
-
systemctl unmount must be used to remove the mount because system opens a file descriptor on the mount point
Pregunta 6
Pregunta
6.- Which program updates the database that is used by the locate command? (Specify ONLY the command without any path or parameters).
Respuesta
-
updatedb
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upgrade
Pregunta 7
Pregunta
7.- What does the command mount --bind do?
Respuesta
-
It makes the contents of one directory available in another directory
-
It mounts all available filesystems to the current directory
-
It mounts all user mountable filesystems to the user's home directory
-
It mounts all file systems listed in /etc/fstab which have the option userbind set
-
It permanently mounts a regular file to a directory
Pregunta 8
Pregunta
8.- Consider the following output from the command ls -i:
How would a new file named c.txt be created with the same inode number as a.txt (Inode 525385)?
Respuesta
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ln -h a.txt c.txt
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ln c.txt a.txt
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ln a.txt c.txt
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In -f c.txt a.txt
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ln -i 525385 c.txt
Pregunta 9
Pregunta
Consider the following directory:
drwxrwxr-x 2 root sales 4096 Jan 1 15:21 sales
Which command ensures new files created within the directory sales are owned by the group sales? (Choose two.)
Respuesta
-
chmod g+s sales
-
setpol -R newgroup=sales sales
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chgrp -p sales sales
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chown --persistent *.sales sales
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chmod 2775 sales
Pregunta 10
Pregunta
10.- In order to display all currently mounted filesystems, which of the following commands could be used? (Choose two.)
Respuesta
-
cat /proc/self/mounts
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free
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lsmounts
-
mount
-
cat /proc/filesystems
Pregunta 11
Pregunta
11.- Which command displays the current disk space usage for all mounted file systems? (Specify ONLY the command without any path or parameters.)
Respuesta
-
df
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ht
Pregunta 12
Pregunta
12.- Which chown command changes the ownership to dave and the group to staff on a file named data.txt?
Respuesta
-
chown dave/staff data.txt
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chown -u dave -g staff data.txt
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chown --user dave --group staff data.txt
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chown dave+staff data.txt
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chown dave:staff data.txt
Pregunta 13
Pregunta
13.- When considering the use of hard links, what are valid reasons not to use hard links?
Respuesta
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Hard links are not available on all Linux systems because traditional filesystems, such as ext4, do not support them
-
Each hard link has individual ownership, permissions and ACLs which can lead to unintended disclosure of file content
-
Hard links are specific to one filesystem and cannot point to files on another filesystem
-
If users other than root should be able to create hard links, suln has to be installed and configured
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When a hard linked file is changed, a copy of the file is created and consumes additional space
Pregunta 14
Pregunta
14.- In compliance with the FHS, in which of the directories are man pages found?
Respuesta
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/opt/man/
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/usr/doc/
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/usr/share/man/
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/var/pkg/man
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/var/man/
Pregunta 15
Pregunta
15.- Which file in the /proc filesystem lists parameters passed from the bootloader to the kernel? (Specify the file name only without any path.)
Respuesta
-
cmdline
-
repeat
Pregunta 16
Pregunta
16.- What is the process ID number of the init process on a System V init based system?
Respuesta
-
-1
-
0
-
1
-
It is different with each reboot
-
It is set to the current run level
Pregunta 17
Pregunta
17.- Which daemon handles power management events on a Linux system?
Respuesta
-
acpid
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batteryd
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pwrmgntd
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psd
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inetd
Pregunta 18
Pregunta
18.- Which of the following statements are true about the boot sequence of a PC using a BIOS? (Choose two.
Respuesta
-
Some parts of the boot process can be configured from the BIOS
-
Linux does not require the assistance of the BIOS to boot a computer
-
The BIOS boot process starts only if secondary storage, such as the hard disk, is functional
-
The BIOS initiates the boot process after turning the computer on
-
The BIOS is started by loading hardware drivers from secondary storage, such as the hard disk
Pregunta 19
Pregunta
19.- What is true regarding UEFI firmware? (Choose two.)
Respuesta
-
It can read and interpret partition tables
-
It can use and read certain file systems
-
It stores its entire configuration on the /boot/ partition
-
It is stored in a special area within the GPT metadata
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It is loaded from a fixed boot disk position
Pregunta 20
Pregunta
20.- A faulty kernel module is causing issues with a network interface card. Which of the following actions ensures that this module is not loaded automatically when the system boots?
Respuesta
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Using lsmod --remove --autoclean without specifying the name of a specific module
-
Using modinfo -k followed by the name of the offending module
-
Using modprobe -r followed by the name of the offending module
-
Adding a blacklist line including the name of the offending module to the file /etc/modprobe.d/blacklist.conf
-
Deleting the kernel module's directory from the file system and recompiling the kernel, including its modules
Pregunta 21
Pregunta
21.- When is the content of the kernel ring buffer reset? (Choose two.)
Respuesta
-
When the ring buffer is explicitly reset using the command dmesg --clear
-
When the ring buffer is read using dmesg without any additional parameters
-
When a configurable amount of time, 15 minutes by default, has passed
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When the kernel loads a previously unloaded kernel module
-
When the system is shut down or rebooted
Pregunta 22
Pregunta
What is the first program the Linux kernel starts at boot time when using System V init?
Respuesta
-
/lib/init.so
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/proc/sys/kernel/init
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/etc/rc.d/rcinit
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/sbin/init
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/boot/init
Pregunta 23
Pregunta
23.- A Debian package creates several files during its installation. Which of the following commands searches for packages owning the file /etc/debian_version?
Respuesta
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apt-get search /etc/debian_version
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apt -r /etc/debian_version
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find /etc/debian_version -dpkg
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dpkg -S /etc/debian_version
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apt-file /etc/debian_version
Pregunta 24
Pregunta
24.- What is contained on the EFI System Partition?
Respuesta
-
The Linux root file system
-
The first stage boot loader
-
The default swap space file
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The Linux default shell binaries
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The user home directories
Pregunta 25
Pregunta
25.- Which of the following directories on a 64 bit Linux system typically contain shared libraries? (Choose two.)
Respuesta
-
~/.lib64/
-
/usr/lib64/
-
/var/lib64/
-
/lib64/
-
/opt/lib64/
Pregunta 26
Pregunta
26.- Which of the following files exist in a standard GRUB 2 installation? (Choose two.)
Respuesta
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/boot/grub/stages/stage0
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/boot/grub/i386-pc/lvm.mod
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/boot/grub/fstab
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/boot/grub/grub.cfg
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/boot/grub/linux/vmlinuz
Pregunta 27
Pregunta
27.- Which of the following commands installs all packages with a name ending with the string foo?
Respuesta
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zypper get '*foo'
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zypper update 'foo?'
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zypper force 'foo*'
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zypper install '*foo'
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zypper add '.*foo'
Pregunta 28
Pregunta
Which of the following properties of a Linux system should be changed when a virtual machine is cloned? (Choose two.)
Respuesta
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The partitioning scheme
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The file system
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The D-Bus Machine ID
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The permissions of /root/
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The SSH host keys
Pregunta 29
Pregunta
29.- Which of the following commands installs GRUB 2 into the master boot record on the third hard disk?
Respuesta
-
grub2 install /dev/sdc
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grub-mkrescue /dev/sdc
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grub-mbrinstall /dev/sdc
-
grub-setup /dev/sdc
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grub-install /dev/sdc
Pregunta 30
Pregunta
30.- Which of the following partition types is used for Linux swap spaces when partitioning hard disk drives?
Respuesta
-
7
-
82
-
83
-
8e
-
fd
Pregunta 31
Pregunta
31 Which command shows kernel ring buffer messages produced during boot and runtime?
Respuesta
-
journalctl -b
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dmesg
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syslog
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bootctl
Pregunta 32
Pregunta
32.- Which directory exposes kernel and system information as a pseudo-filesystem?
Respuesta
-
/proc
-
/boot
-
/var
-
/opt
Pregunta 33
Pregunta
33.- Which command lists currently loaded kernel modules?
Respuesta
-
depmod
-
modinfo
-
insmod
-
lsmod
Pregunta 34
Pregunta
34.- To load a kernel module at runtime, which command is used?
Respuesta
-
modprobe <module>
-
insmod -r <module>
-
rmmod <module>
-
depmod <module>
Pregunta 35
Pregunta
35.- Where are modprobe configuration files typically stored for blacklisting modules?
Respuesta
-
/etc/modprobe.d/
-
/etc/modules-load.d/
-
/usr/lib/modprobe.d/
-
/boot/modprobe/
Pregunta 36
Pregunta
36.- Which file shows the kernel version currently running?
Respuesta
-
/etc/os-release
-
/proc/version
-
/boot/grub/grub.cfg
-
/var/log/messages
Pregunta 37
Pregunta
37.- Which command updates module dependency and map files?
Respuesta
-
depmod
-
modprobe -r
-
modinfo
-
lsmod
Pregunta 38
Pregunta
38.- Which tool displays PCI devices and vendor/product IDs?
Respuesta
-
lsusb
-
lspci
-
lsblk
-
hwinfo
Pregunta 39
Pregunta
39.- Which pseudo-file contains the list of CPU info?
Respuesta
-
/proc/uptime
-
/proc/cpuinfo
-
/proc/meminfo
-
/proc/stat
Pregunta 40
Pregunta
40.- Where is the kernel image usually stored on a Linux system?
Respuesta
-
/bin/vmlinuz
-
/boot/
-
/lib/modules/
-
/usr/src/
Pregunta 41
Pregunta
41.- What does UEFI system firmware store boot entries in?
Respuesta
-
MBR boot record
-
NVRAM
-
/etc/fstab
-
/boot/grub/grub.cfg
Pregunta 42
Pregunta
42.- Which utility shows and manipulates UEFI boot entries?
Respuesta
-
grub-install
-
efibootmgr
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bootctl
-
systemctl
Pregunta 43
Pregunta
43.- In MBR partitioning, where is the boot code located?
Respuesta
-
GPT header
-
First sector (MBR)
-
/boot/efi
-
/etc/grub.d/
Pregunta 44
Pregunta
44.- What is the purpose of an initramfs/initrd?
Respuesta
-
Replace the kernel
-
Provide initial userspace before root FS mounts
-
Store GRUB configuration
-
Manage user accounts during boot
Pregunta 45
Pregunta
45.- Which command regenerates an initramfs on Debian/Ubuntu?
Respuesta
-
mkinitrd
-
update-initramfs -u
-
dracut --force
-
mkinitcpio -p linux
Pregunta 46
Pregunta
46.-On systems using dracut, which command rebuilds the initramfs?
Respuesta
-
update-initramfs
-
dracut --force
-
mkinitramfs
-
genkernel
Pregunta 47
Pregunta
47.- Which GRUB2 file is automatically generated and should not be edited directly?
Respuesta
-
/etc/default/grub
-
/boot/grub/grub.cfg
-
/etc/grub.d/40_custom
-
/usr/lib/grub/menu.lst
Pregunta 48
Pregunta
48.- Which file configures default GRUB kernel parameters?
Respuesta
-
/boot/grub/grub.cfg
-
/etc/default/grub
-
/etc/grub.d/
-
/etc/grub.conf
Pregunta 49
Pregunta
49.- Which command regenerates GRUB configuration (on Debian/Ubuntu)?
Respuesta
-
grub-install
-
grub-mkconfig -o /boot/grub/grub.cfg
-
update-grub
-
Both B and C
Pregunta 50
Pregunta
50.- What does grub-install do?
Respuesta
-
Create /boot/grub/grub.cfg
-
Install GRUB bootloader to disk/EFI
-
Generate initramfs
-
Update kernel parameters
Pregunta 51
Pregunta
51.- Which kernel parameter passes options to init (PID 1) or init system?
Respuesta
-
root=
-
ro
-
init=
-
quiet
Pregunta 52
Pregunta
52.- To boot into single-user mode with systemd you can append which kernel parameter?
Respuesta
-
single
-
systemd.unit=rescue.target
-
init=/bin/bash
-
runlevel=1
Pregunta 53
Pregunta
53.- Which target is analogous to SysV runlevel 3 (multi-user, non-graphical) in systemd?
Respuesta
-
graphical.target
-
multi-user.target
-
rescue.target
-
default.target
Pregunta 54
Pregunta
54.- How do you check the default systemd target?
Respuesta
-
systemctl get-default
-
systemctl default
-
systemctl status default.target
-
systemctl list-unit-files
Pregunta 55
Pregunta
55.- Which command sets the default systemd target to graphical?
Respuesta
-
systemctl isolate graphical.target
-
systemctl set-default graphical.target
-
systemctl enable graphical.service
-
systemctl start graphical.target
Pregunta 56
Pregunta
56.- What does systemctl isolate rescue.target do?
Respuesta
-
Permanently sets rescue.target as default
-
Immediately switches to rescue.target (stops other units)
-
Reboots into rescue mode on next boot
-
Enables rescue.service at boot
Pregunta 57
Pregunta
57.- Which SysV file historically defined runlevels?
Respuesta
-
/etc/systemd/system/default.target
-
/etc/inittab
-
/etc/rc.local
-
/proc/runlevel
Pregunta 58
Pregunta
58.- In legacy SysV, which runlevel is used for system halt/poweroff?
Respuesta
-
1
-
3
-
0
-
6
Pregunta 59
Pregunta
59.- Which command in SysV init changes the current runlevel?
Respuesta
-
systemctl isolate
-
telinit
-
runlevel
-
initctl
Pregunta 60
Pregunta
60.- What file lists kernel command line at runtime?
Respuesta
-
/proc/cmdline
-
/etc/default/grub
-
/boot/grub/grub.cfg
-
/etc/grub.d/
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