XK0-005 practice questions 81–90

1. Question 81 · 300 in bank

   As part of the requirements for installing a new application, the swappiness parameter needs to be changed to 0. This change needs to persist across reboots and be applied immediately. A Linux systems administrator is performing this change. Which of the following steps should the administrator complete to accomplish this task?

   • Aecho "vm.swappiness=0" >> /etc/sysctl.conf && sysctl -p
   • Becho "vm.swappiness=0" >> /proc/meminfo && sysctl -a
   • Csysctl -v >> /proc/meminfo && echo "vm.swapiness=0"
   • Dsysctl -h "vm.swapiness=0" && echo /etc/vmswapiness

   Show answer

   Answer: A

   Explanation

   Linux swappiness is a kernel parameter that determines how aggressively the Linux virtual machine (VM) swaps pages between memory and the swap space on the system's disk. Users can fine-tune the rate at which a Linux kernel can move pages into and out of active memory using the swappable parameter, which can be set between 0 and 200. The higher the number, the more aggressively the VM swaps data to disk. By default, the swappiness value on most Linux computers is set to 60. The user can change this level to a different setting either temporarily or indefinitely. Some database servers managed cache to use RAM, and is capable of managing what should be in RAM and what shouldn’t be. Allowing the Linux operating system to have too much control over what memory pages are in RAM is likely to lower your database performance. Therefore, it is recommended that swappiness should be set to 0.

   Source: Adapted from community discussion — Damon54

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2. Question 82 · 300 in bank

   A systems administrator wants to list all local accounts in which the UID is greater than 500. Which of the following commands will give the correct output?

   • Afind /etc/passwd -size +500
   • Bcut -d: -f1 /etc/passwd > 500
   • Cawk -F: '$3 > 500 {print $1}' /etc/passwd
   • Dsed '/UID/' /etc/passwd < 500

   Show answer

   Answer: C

   Explanation

   awk -F: '$3 > 500 {print $1}' /etc/passwd {print $1} The $1 stands for the first field, in this case the first column. Option - F --field-separator I did a test and it works !!

   Source: Adapted from community discussion — Damon54

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3. Question 83 · 300 in bank

   A systems administrator is tasked with changing the default shell of a system account in order to disable iterative logins. Which of the following is the BEST option for the administrator to use as the new shell?

   • A/sbin/nologin
   • B/bin/sh
   • C/sbin/setenforce
   • D/bin/bash

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   Answer: A

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4. Question 84 · 300 in bank

   A junior systems administrator recently installed an HBA card in one of the servers that is deployed for a production environment. Which of the following commands can the administrator use to confirm on which server the card was installed?

   • Alspci | egrep ‘hba|fibr’
   • Blspci | zgrep ‘hba|fibr’
   • Clspci | pgrep ‘hba|fibr’
   • Dlspci | ‘hba|fibr’

   Show answer

   Answer: A

   Explanation

   A. lspci | egrep ‘hba|fibr’ Egrep is a shortcut to the grep -E command. The -E option allows the use of regular expressions for text filtering. For example: +, |, () etc.

   Source: Adapted from community discussion — Damon54

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5. Question 85 · 300 in bank

   A new disk was presented to a server as /dev/sdd. The systems administrator needs to check if a partition table is on that disk. Which of the following commands can show this information?

   • Alsscsi
   • Bfdisk
   • Cblkid
   • Dpartprobe

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   Answer: B

   Explanation

   A. lsscsi - > The lsscsi command lists information about SCSI devices in Linux B. fdisk -> The fdisk utility is a common partition table manipulator for Linux. Use fdisk –l to list the partition table C. blkid-> The blkid command allows you to display information about available block devices. D. partprobe -> partprobe is a program that informs the operating system kernel of partition table changes, by requesting that the operating system re-read the partition table.

   Source: Adapted from community discussion — Damon54

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6. Question 86 · 300 in bank

   A systems administrator wants to upgrade /bin/someapp to a new version, but the administrator does not know the package name. Which of the following will show the RPM package name that provides that binary file?

   • Arpm -qf /bin/someapp
   • Brpm -Vv /bin/someapp
   • Crpm -p /bin/someapp
   • Drpm -i /bin/someapp

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   Answer: A

   Explanation

   Use the command 'rpm -qf' or 'yum whatprovides' to get the package name from a binary file or library file on the server.

   Source: Adapted from community discussion — Damon54

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7. Question 87 · 300 in bank

   A systems administrator is installing various software packages using a package manager. Which of the following commands would the administrator use on the Linux server to install the package?

   • Awinget
   • Bsoftwareupdate
   • Cyum-config
   • Dapt

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   Answer: D

   Explanation

   Red Hat Package Managers Red Hat Package Manager (RPM) Yellow Dog Update Manager (YUM) Dandified YUM (DNF) package manager Debian Package Managers (RPM) dpkg package manager Advanced Packaging Tool (APT)

   Source: Adapted from community discussion — Damon54

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8. Question 88 · 300 in bank

   An administrator deployed a Linux server that is running a web application on port 6379/tcp. SELinux is in enforcing mode based on organization policies. The port is open on the firewall. Users who are trying to connect to a local instance of the web application receive Error 13, Permission denied. The administrator ran some commands that resulted in the following output:

   

   Which of the following commands should be used to resolve the issue?

   • Asemanage port -d -t http_port_t -p tcp 6379
   • Bsemanage port -a -t http_port_t -p tcp 6379
   • Csemanage port -a http_port_t -p top 6379
   • Dsemanage port -l -t http_port_tcp 6379

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   Answer: B

   Explanation

   The semanage command is used to manage SELinux policy settings on Linux systems. In this case, the semanage port -a -t http_port_t -p tcp 6379 command is adding a new SELinux port type for the TCP protocol and port number 6379. Here's what each option does: -a: The -a option stands for "add", and it is used to add a new SELinux port type. -t http_port_t: The -t option is used to specify the SELinux type for the new port, in this case, http_port_t. -p tcp 6379: The -p option is used to specify the protocol and port number, in this case, TCP protocol and port number 6379. With this command, the SELinux policy is updated to allow the TCP protocol to listen on port number 6379 with the http_port_t type. This is useful in cases where the application requires the use of a non-standard port number for HTTP traffic.

   Source: Adapted from community discussion — linux_admin

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9. Question 89 · 300 in bank

   DRAG DROP - You have been asked to parse a log file of logins to determine various information about who is logging in and when. INSTRUCTIONS - Open and inspect the Login log file. Drag and drop the correct commands onto the output that was generated from that command. Tokens can be used only once and not all will be used. If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

   

   This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

   Show the answer figure

   Answer: See figure below

   Explanation

   sure, 1. grep "Mar 13" log.txt -- printout only line that contain "Mar 13" from log.txt file 2. tr '[a-z]' [A - Z]' < log.txt | grep -i "mar 12" -- notice that there are only 2 "tr" options to choose from, and '[a-z]' '[A-Z]' mean translates all lowercase to UPPER case. 3. awk '{print $1}' log.txt | sort | uniq -- printout the first column ($1) from the log.txt file, which happen to be the name field -- sort by the ($1) name field. -- only display unique name (no duplicate name) of the ($1) name field

   Source: Adapted from community discussion — NastyNutsu

   

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10. Question 90 · 300 in bank

    An administrator started a long-running process in the foreground that needs to continue without interruption. Which of the following keystrokes should the administrator use to continue running the process in the background?

    • Abg
    • Bbg
    • Cjobs -1
    • Dbg &

    Show answer

    Answer: A

    Explanation

    If the command is already running in your terminal, you can enter CTRL+Z to pause the process, then "bg" to resume the process in the background. Or, if your process is not running yet, add an "&" to the end of your command to run it in the background.

    Source: Adapted from community discussion — makuziker

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XK0-005 practice, question 81. 300 questions available.