40238963
Descripción
Test por David OkOk, actualizado hace 12 meses
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Creado por David OkOk
hace más de 1 año
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Pregunta 1
Pregunta
1.- Which kernel parameter controls the console verbosity at boot (quiet vs verbose)?
Respuesta
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loglevel= or quiet
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verbose=
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console= only
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debug=
Pregunta 2
Pregunta
2.- To view the system’s last reboot reason via systemd, which command helps?
Respuesta
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last -x Reboot
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journalctl -b -1
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systemctl --failed
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Both A and B (various info)
Pregunta 3
Pregunta
3.- Which tool on Debian/Ubuntu lists kernel packages installed so you can match /lib/modules folders?
Respuesta
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dpkg -l 'linux-image*'
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rpm -qa kernel
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pacman -Q linux
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apt-cache search linux
Pregunta 4
Pregunta
4.- Which systemd directive makes a unit start automatically at boot?
Respuesta
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systemctl enable <unit>
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systemctl start <unit>
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systemctl reserve <unit>
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systemctl boot <unit>
Pregunta 5
Pregunta
5.- When troubleshooting a failed boot, which of these is the most useful first step?
Respuesta
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Examine bootloader config (/boot/grub/grub.cfg) and kernel params
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Reinstall the OS immediately
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Delete /boot contents and retry
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Modify /etc/passwd
Pregunta 6
Pregunta
6.- Which command will list active targets and their dependencies?
Respuesta
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systemctl list-dependencies --reverse <target>
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systemctl show <target>
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systemctl list-units
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systemctl list-dependencies <target>
Pregunta 7
Pregunta
7.- How do you instruct GRUB to boot a kernel with a different root device only for this boot?
Respuesta
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Edit kernel root= parameter from GRUB menu before boot
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Change /etc/fstab permanently
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Use grub-set-root after boot
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Reinstall GRUB
Pregunta 8
Pregunta
8.- Which file may be used to blacklist an initramfs hook or module in dracut?
Respuesta
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/etc/dracut.conf or /etc/dracut.conf.d/*.conf
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/etc/modprobe.d/blacklist.conf only
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/boot/dracut.blacklist
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/etc/initramfs-tools/conf.d/ (dracut uses dracut.conf)
Pregunta 9
Pregunta
9.- What command returns the current and previous runlevels on a SysV system?
Respuesta
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runlevel
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who -r
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Both A and B
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systemctl runlevel
Pregunta 10
Pregunta
10.- Which is the safe sequence to shutdown the machine and power off using SysV utilities?
Respuesta
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shutdown -h now
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init 0
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poweroff
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Any of the above (they request a halt/poweroff coordinated by init/systemd)
Pregunta 11
Pregunta
11.- Which command is used to list all partitions on all disks?
Respuesta
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fdisk -l
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lsblk -f
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blkid
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df -h
Pregunta 12
Pregunta
12.- Which tool is used to create or modify GPT partition tables?
Respuesta
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fdisk
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parted
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mkfs
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lsblk
Pregunta 13
Pregunta
13.- Which command displays information about block devices in a tree structure?
Respuesta
-
df
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lsblk
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blkid
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mount
Pregunta 14
Pregunta
14.- What is the maximum number of primary partitions allowed in an MBR disk?
Respuesta
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2
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4
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6
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8
Pregunta 15
Pregunta
15.- Which partition type is used to contain logical partitions in MBR?
Respuesta
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Swap partition
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Extended partition
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Primary partition
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Boot partition
Pregunta 16
Pregunta
16.- Which utility displays filesystem UUIDs and types?
Respuesta
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blkid
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df
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ls
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parted
Pregunta 17
Pregunta
17.- What is the purpose of the mkswap command?
Respuesta
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Mounts swap partitions
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Formats a partition as swap space
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Activates swap memory
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Deactivates swap memory
Pregunta 18
Pregunta
18.- Which command activates all swap areas listed in /etc/fstab?
Respuesta
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swapon -a
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swapoff -a
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systemctl enable swap
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mount -a
Pregunta 19
Pregunta
19.- Which tool can resize partitions interactively on a running system?
Respuesta
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parted
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fdisk
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cfdisk
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mkfs
Pregunta 20
Pregunta
20.- What command displays the total swap usage?
Respuesta
-
df -h
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swapon -s
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top
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lsblk
Pregunta 21
Pregunta
21.- Which LVM command creates a physical volume?
Respuesta
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vgcreate
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pvcreate
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lvcreate
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lvextend
Pregunta 22
Pregunta
22.- Which file contains partition information for traditional systems?
Respuesta
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/etc/partitions
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/proc/partitions
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/etc/fstab
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/boot/grub/grub.cfg
Pregunta 23
Pregunta
23.- Which command initializes a volume group in LVM?
Respuesta
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lvcreate
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vgcreate
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pvcreate
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vgextend
Pregunta 24
Pregunta
24.- Which tool is used to create logical volumes?
Respuesta
-
lvcreate
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vgcreate
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pvcreate
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mkfs
Pregunta 25
Pregunta
25.- Which command extends an existing logical volume?
Respuesta
-
lvextend
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pvextend
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vgextend
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resize2fs
Pregunta 26
Pregunta
26.- Which file defines partitions mounted automatically at boot?
Respuesta
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/etc/partitions
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/etc/fstab
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/etc/mounts
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/proc/mounts
Pregunta 27
Pregunta
27.- What is the function of vgextend?
Respuesta
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Add a new logical volume
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Add a physical volume to a volume group
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Extend a logical volume
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Display volume groups
Pregunta 28
Pregunta
28.- Which command displays all existing volume groups?
Respuesta
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lvdisplay
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vgdisplay
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pvdisplay
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lvs
Pregunta 29
Pregunta
29.- What command is used to create a GPT partition table?
Respuesta
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fdisk /dev/sda
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parted /dev/sda mklabel gpt
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mkfs.gpt /dev/sda
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gdisk --gpt /dev/sda
Pregunta 30
Pregunta
30.- Which tool is used to create a new filesystem on a partition?
Respuesta
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mkfs
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fdisk
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parted
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mount
Pregunta 31
Pregunta
31.- Which command can display filesystem usage and available space?
Respuesta
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du
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df -h
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lsblk
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mount
Pregunta 32
Pregunta
32.- What is the name of the metadata area in an LVM physical volume?
Respuesta
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PE (Physical Extent)
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VG descriptor
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PV header
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LV header
Pregunta 33
Pregunta
33.- What is the smallest unit of allocation in LVM?
Respuesta
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Physical volume
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Volume group
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Physical extent
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Logical volume
Pregunta 34
Pregunta
34.- Which tool displays UUIDs for swap and partitions?
Respuesta
-
lsblk -f
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blkid
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cat /etc/fstab
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df -T
Pregunta 35
Pregunta
35.- Which command creates a swap file of 1 GB size?
Respuesta
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dd if=/dev/zero of=/swapfile bs=1M count=1024
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mkswap /swapfile 1G
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mkfile 1G /swapfile
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swapon /swapfile
Pregunta 36
Pregunta
36.- Which command displays detailed information about logical volumes?
Respuesta
-
lvdisplay
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vgdisplay
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pvdisplay
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lvscan
Pregunta 37
Pregunta
37.- Which command creates a snapshot of a logical volume?
Respuesta
-
lvcreate -s
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vgcreate -s
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pvcreate -s
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lvextend -s
Pregunta 38
Pregunta
38.- What is the main purpose of an LVM snapshot?
Respuesta
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To back up data consistently
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To extend a logical volume
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To resize a filesystem
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To defragment storage
Pregunta 39
Pregunta
39.- Which command removes a logical volume?
Respuesta
-
lvdelete
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lvremove
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vgremove
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pvremove
Pregunta 40
Pregunta
40.- To resize a filesystem after extending an LVM volume, which command is used for ext4 filesystems?
Respuesta
-
resize2fs
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xfs_growfs
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fsck
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mkfs.ext4
Pregunta 41
Pregunta
41.- What must be done before reducing a logical volume’s size?
Respuesta
-
Run vgextend
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Unmount the filesystem and shrink it first
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Add more physical extents
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Activate the volume group
Pregunta 42
Pregunta
42.- Which LVM command deactivates a volume group?
Respuesta
-
vgdeactivate
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vgchange -a n
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vgstop
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vgremove
Pregunta 43
Pregunta
43.- What is the default size unit for LVM extents?
Respuesta
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2 MB
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4 MB
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8 MB
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16 MB
Pregunta 44
Pregunta
44.- Which command creates a new swap area on an existing partition?
Respuesta
-
mkfs.swap /dev/sdb2
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mkswap /dev/sdb2
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swapon /dev/sdb2
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swapcreate /dev/sdb2
Pregunta 45
Pregunta
45.- How can you permanently enable a swap file?
Respuesta
-
Add it to /etc/fstab
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Run swapon -a once
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Modify /etc/swap.conf
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Use systemctl enable swap
Pregunta 46
Pregunta
46.- Which command shows all currently active swap areas?
Respuesta
-
cat /proc/meminfo
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swapon --show
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free -m
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lsblk
Pregunta 47
Pregunta
47.- Which filesystem type is used for Linux swap space?
Respuesta
-
ext4
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swapfs
-
swap
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none
Pregunta 48
Pregunta
48.- What happens when physical memory is exhausted and no swap is available?
Respuesta
-
The system slows down
-
The kernel kills processes (OOM killer)
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The system reboots
-
Swap is created automatically
Pregunta 49
Pregunta
49.- Which command converts an MBR disk to GPT safely (non-destructive)?
Respuesta
-
gdisk
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fdisk
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parted mklabel
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mkfs.gpt
Pregunta 50
Pregunta
50.- Which partition flag marks a partition as bootable in MBR?
Respuesta
-
boot
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active
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bios_grub
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uefi_boot
Pregunta 51
Pregunta
51.- How can you view partition table type (MBR or GPT)?
Respuesta
-
cat /etc/fstab
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parted /dev/sda print
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lsblk -a
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blkid
Pregunta 52
Pregunta
52.- Which tool is preferred for managing GPT disks interactively?
Respuesta
-
cfdisk
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gdisk
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fdisk
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mkfs
Pregunta 53
Pregunta
53.- What is the purpose of the /etc/lvm/backup/ directory?
Respuesta
-
Stores volume group metadata backups
-
Contains LVM log files
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Lists all mounted LVs
-
Holds filesystem backups
Pregunta 54
Pregunta
54.- Which command shows the mapping between logical and physical extents?
Respuesta
-
lvdisplay -m
-
vgdisplay -v
-
pvscan
-
lvscan
Pregunta 55
Pregunta
55.- Which LVM command removes a volume group?
Respuesta
-
vgdelete
-
vgremove
-
lvremove
-
pvremove
Pregunta 56
Pregunta
56.- Which command initializes a disk as an LVM physical volume?
Respuesta
-
lvcreate /dev/sdb
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vgcreate /dev/sdb
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pvcreate /dev/sdb
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lvm /dev/sdb
Pregunta 57
Pregunta
47.- Which command lists all volume groups on the system?
Respuesta
-
vgs
-
pvs
-
lvs
-
vgscan
Pregunta 58
Pregunta
58.- How can you identify all physical volumes currently present?
Respuesta
-
vgdisplay
-
pvdisplay
-
lvdisplay
-
pvlist
Pregunta 59
Pregunta
49.- Which command enables you to label a partition manually?
Respuesta
-
e2label
-
lsblk -L
-
fdisk -L
-
blkid -L
Pregunta 60
Pregunta
60.- Which command verifies the integrity of an ext4 filesystem?
Respuesta
-
fsck.ext4
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mkfs.ext4
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resize2fs
-
tune2fs
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