XK0-005 practice questions 31–40

1. Question 31 · 300 in bank

   Select 2

   A systems administrator is notified that the mysqld process stopped unexpectedly. The systems administrator issues the following command: sudo grep –i -r ‘out of memory’ /var/log The output of the command shows the following: kernel: Out of memory: Kill process 9112 (mysqld) score 511 or sacrifice child. Which of the following commands should the systems administrator execute NEXT to troubleshoot this issue? (Select two).

   • Afree -h
   • Bnc -v 127.0.0.1 3306
   • Crenice -15 $( pidof mysql )
   • Dlsblk
   • Ekillall -15
   • Fvmstat -a 1 4

   Show answer

   Answer: AF

   Explanation

   A: i like A because it will tell us if we need to add more swap space. B: this is netcat command so not relevant C: we might need to renice, in the event that a child process was killed, but we dont know if it was the child process or not. but regargles, -15 is not a very nice number. D: listing storage doesnt help really E: invalid syntax F: not sure how this info will help. By process of elimination I am going with A to check if we can add some swap.. and F to get an overall fee for how the system is doing.. this question is ridiculus

   Source: Adapted from community discussion — TheRealManish

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2. Question 32 · 300 in bank

   Users have reported that the interactive sessions were lost on a Linux server. A Linux administrator verifies the server was switched to rescue.target mode for maintenance. Which of the following commands will restore the server to its usual target?

   • Atelinit 0
   • Bsystemctl reboot
   • Csystemctl get-default
   • Dsystemctl emergency

   Show answer

   Answer: B

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3. Question 33 · 300 in bank

   A systems administrator was tasked with assigning the temporary IP address/netmask 192.168.168.1/255.255.255.255 to the interface eth0 of a Linux server. When adding the address, the following error appears: # ip address add 192.168.168.1/33 dev eth0 Error: any valid prefix is expected rather than "192.168.168.1/33". Based on the command and its output above, which of the following is the cause of the issue?

   • AThe CIDR value /33 should be /32 instead.
   • BThere is no route to 192.168.168.1/33.
   • CThe interface eth0 does not exist.
   • DThe IP address 192.168.168.1 is already in use.

   Show answer

   Answer: A

   Explanation

   The cause of the issue is that the prefix length specified in the IP address/netmask is invalid. In the command ip address add 192.168.168.1/33 dev eth0, the prefix length is specified as /33, which is not a valid prefix length. In IP networking, the prefix length specifies the number of bits in the network portion of the address. For example, a netmask of 255.255.255.0 corresponds to a prefix length of /24, because the first 24 bits of the address are used for the network portion. The valid prefix lengths depend on the address class and type. For IPv4 addresses, the prefix length must be between 0 and 32. A prefix length of 33 is not valid, and that is why the command produced an error. To fix the issue, the systems administrator should use a valid prefix length in the IP address/netmask, such as /32 if the address is a host address or /24 if the address is a network address. For example: ip address add 192.168.168.1/32 dev eth0

   Source: Adapted from community discussion — linux_admin

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4. Question 34 · 300 in bank

   A Linux user reported the following error after trying to connect to the system remotely: ssh: connect to host 10.0.1.10 port 22: Resource temporarily unavailable The Linux systems administrator executed the following commands in the Linux system while trying to diagnose this issue:

   

   Which of the following commands will resolve this issue?

   • Afirewall-cmd --zone=public --permanent --add-service=22
   • Bsystemctl enable firewalld; systemctl restart firewalld
   • Cfirewall-cmd --zone=public --permanent --add-service=ssh
   • Dfirewall-cmd --zone=public --permanent --add-port=22/udp

   Show answer

   Answer: C

   Explanation

   The command firewall-cmd --zone=public --permanent --add-service=ssh is used to add the SSH service to the list of allowed services in the firewall configuration of a Linux system. Here is a breakdown of the command: firewall-cmd is the command-line tool used to manage the firewall configuration in a Linux system that uses the firewalld firewall daemon. --zone=public specifies the firewall zone to which the rule should be applied. The public zone is one of the predefined zones in firewalld that is typically used for public-facing network interfaces. --permanent specifies that the rule should be made persistent across firewall reloads or system reboots. --add-service=ssh specifies that the ssh service should be allowed in the firewall configuration. The ssh service is a predefined service in firewalld that allows incoming SSH traffic on port 22.

   Source: Adapted from community discussion — linux_admin

   References

   • Red Hat documentation

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5. Question 35 · 300 in bank

   A systems administrator needs to clone the partition /dev/sdc1 to /dev/sdd1. Which of the following commands will accomplish this task?

   • Atar -cvzf /dev/sdd1 /dev/sdc1
   • Brsync /dev/sdc1 /dev/sdd1
   • Cdd if=/dev/sdc1 of=/dev/sdd1
   • Dscp /dev/sdc1 /dev/sdd1

   Show answer

   Answer: C

   Explanation

   C. dd if=/dev/sdc1 of=/dev/sdd1 The dd command is a low-level utility that can be used to copy data from one location to another. In this case, the administrator wants to clone the partition /dev/sdc1 to /dev/sdd1. To accomplish this, the administrator should run the following command: dd if=/dev/sdc1 of=/dev/sdd1 The if option specifies the input file, which is /dev/sdc1 in this case. The of option specifies the output file, which is /dev/sdd1. The dd command will read the data from /dev/sdc1 and write it to /dev/sdd1, effectively cloning the partition. Note that the dd command is a very powerful tool and can cause data loss if used improperly. The administrator should make sure to backup important data before using the dd command, and be very careful when specifying the input and output files.

   Source: Adapted from community discussion — linux_admin

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6. Question 36 · 300 in bank

   A Linux administrator has been tasked with installing the most recent versions of packages on a RPM-based OS. Which of the following commands will accomplish this task?

   • Aapt-get upgrade
   • Brpm -a
   • Cyum updateinfo
   • Ddnf update
   • Eyum check-update

   Show answer

   Answer: D

   Explanation

   D. dnf update Explanation: dnf is the default package manager for RPM-based Linux distributions like Fedora, CentOS, and RHEL. The update command is used to update all installed packages to their latest versions. Running dnf update will download and install the latest versions of all installed packages, along with any necessary dependencies. The other options are not correct for the following reasons: apt-get is a package manager for Debian-based distributions and not RPM-based distributions. rpm -a is used to query information about all installed packages and not update them. yum updateinfo is used to display information about available updates but not update packages. yum check-update is used to check for available updates but not install them.

   Source: Adapted from community discussion — linux_admin

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7. Question 37 · 300 in bank

   A Linux administrator needs to expand a volume group using a new disk. Which of the following options presents the correct sequence of commands to accomplish the task?

   • Apartprobe vgcreate lvextend
   • Blvcreate fdisk partprobe
   • Cfdisk partprobe mkfs
   • Dfdisk pvcreate vgextend

   Show answer

   Answer: D

   Explanation

   D. fdisk, partprobe, pvcreate, vgextend Explanation: fdisk is used to create a partition on the new disk. partprobe is used to inform the OS of the new partition and update the kernel's partition table. pvcreate is used to create a physical volume on the new partition. vgextend is used to extend the volume group to include the new physical volume. The other options are not correct for the following reasons: Option A is not correct because it is missing the pvcreate and vgextend commands, which are required to create a physical volume and extend the volume group to include the new physical volume. Option B is not correct because it uses lvcreate instead of pvcreate to create a new logical volume, which is not necessary for expanding a volume group using a new disk. Option C is not correct because it uses mkfs to create a file system, which is not necessary for expanding a volume group using a new disk. Additionally, it is missing the pvcreate and vgextend commands, which are required to create a physical volume and extend the volume group to include the new physical volume.

   Source: Adapted from community discussion — linux_admin

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8. Question 38 · 300 in bank

   Which of the following directories is the mount point in a UEFI system?

   • A/sys/efi
   • B/boot/efi
   • C/efi
   • D/etc/efi

   Show answer

   Answer: B

   Explanation

   In a UEFI (Unified Extensible Firmware Interface) system, the system firmware requires a partition to store boot loaders and other boot-related data. This partition is usually a small FAT32 partition, and it is mounted as the EFI system partition (ESP). The most common mount point for the ESP is /boot/efi. It is usually a small partition with a size between 100MB and 500MB and it is shared between different operating systems in a multi-boot environment. The contents of the ESP typically include boot loaders, kernel images, configuration files, and other boot-related files

   Source: Adapted from community discussion — linux_admin

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9. Question 39 · 300 in bank

   A Linux administrator copied a Git repository locally, created a feature branch, and committed some changes to the feature branch. Which of the following Git actions should the Linux administrator use to publish the changes to the main branch of the remote repository?

   • Arebase
   • Btag
   • Ccommit
   • Dpush

   Show answer

   Answer: D

   Explanation

   In Git, the "push" command is used to publish local changes to a remote repository. When the administrator makes changes to the feature branch, the changes are only available in the local repository. If the changes are ready to be merged into the main branch of the remote repository, the administrator can use the "push" command to upload the changes to the remote repository. This will make the changes available to others who are also working on the same repository. Before pushing the changes to the remote repository, the administrator should first ensure that the changes are committed to the local repository using the "commit" command. The administrator should also ensure that the local repository is up-to-date with the remote repository by using the "pull" command to download any changes made by others before attempting to push the changes. Once the changes are committed and the local repository is up-to-date, the administrator can use the "push" command to upload the changes to the remote repository.

   Source: Adapted from community discussion — linux_admin

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10. Question 40 · 300 in bank

    A Linux administrator needs to obtain a list of all volumes that are part of a volume group. Which of the following commands should the administrator use to accomplish this task?

    • Avgs
    • Blvs
    • Cfdisk -1
    • Dpvs

    Show answer

    Answer: B

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XK0-005 practice, question 31. 300 questions available.