XK0-005 practice questions 1–10

1. Question 1 · 300 in bank

   An administrator accidentally deleted the /boot/vmlinuz file and must resolve the issue before the server is rebooted. Which of the following commands should the administrator use to identify the correct version of this file?

   • Arpm -qa | grep kernel; uname -a
   • Byum -y update; shutdown -r now
   • Ccat /etc/centos-release; rpm -Uvh --nodeps
   • Dtelinit 1; restorecon -Rv /boot

   Show answer

   Answer: A

   Explanation

   A. rpm -qa | grep kernel; uname -a The administrator can use the command "rpm -qa | grep kernel" to identify the installed kernel packages on the system, and "uname -a" to display information about the current running kernel. The output of these commands can be used to determine the correct version of the /boot/vmlinuz file that needs to be restored.

   Source: Adapted from community discussion — linux_admin

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2. Question 2 · 300 in bank

   A systems administrator is troubleshooting connectivity issues and trying to find out why a Linux server is not able to reach other servers on the same subnet it is connected to. When listing link parameters, the following is presented:

   

   Based on the output above, which of following is the MOST probable cause of the issue?

   • AThe address ac:00:11:22:33:cd is not a valid Ethernet address.
   • BThe Ethernet broadcast address should be ac:00:11:22:33:ff instead.
   • CThe network interface eth0 is using an old kernel module.
   • DThe network interface cable is not connected to a switch.

   Show answer

   Answer: D

   Explanation

   D. The network interface cable is not connected to a switch. The output shows that the state of the network interface eth0 is "DOWN". This means that the interface is not currently transmitting or receiving data. The "NO-CARRIER" status also suggests that the interface is not connected to a network. The most probable cause of the issue is that the network interface cable is not connected to a switch, or that the switch the cable is connected to is not functioning correctly. When a network interface is down, it usually means that there is an issue with the physical or logical connection to the network.

   Source: Adapted from community discussion — linux_admin

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3. Question 3 · 300 in bank

   A DevOps engineer needs to allow incoming traffic to ports in the range of 4000 to 5000 on a Linux server. Which of the following commands will enforce this rule?

   • Aiptables -f filter -I INPUT -p tcp --dport 4000:5000 -A ACCEPT
   • Biptables -t filter -A INPUT -p tcp --dport 4000:5000 -j ACCEPT
   • Ciptables filter -A INPUT -p tcp --dport 4000:5000 -D ACCEPT
   • Diptables filter -S INPUT -p tcp --dport 4000:5000 -A ACCEPT

   Show answer

   Answer: B

   Explanation

   The command iptables is used to manage the rules in the Linux kernel's firewall. The options used in the command determine how the rule will be enforced. In the case of option B, -t filter specifies that the rules should be applied to the filter table, which is used for packet filtering. The -A INPUT option specifies that the rule should be appended to the INPUT chain, which is used for incoming traffic. The -p tcp option specifies that the rule should only apply to TCP traffic, and the --dport 4000:5000 option specifies that the rule should only apply to incoming traffic to ports in the range of 4000 to 5000. The -j ACCEPT option specifies that the matching traffic should be accepted, allowing it to enter the system.

   Source: Adapted from community discussion — linux_admin

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4. Question 4 · 300 in bank

   A Linux administrator needs to determine whether a hostname is in the DNS. Which of the following would supply the information that is needed?

   • Anslookup
   • Brsynс
   • Cnetstat
   • Dhost

   Show answer

   Answer: D

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5. Question 5 · 300 in bank

   A server is experiencing intermittent connection issues. Some connections to the Internet work as intended, but some fail as if there is no connectivity. The systems administrator inspects the server configuration:

   

   Which of the following is MOST likely the cause of the issue?

   • AAn internal-only DNS server is configured.
   • BThe IP netmask is wrong for ens3.
   • CTwo default routes are configured.
   • DThe ARP table contains incorrect entries.

   Show answer

   Answer: B

   Explanation

   well the 89 networks definitely have a subnet ID problem, but I'm not sure if that's the reason there is a problem here.

   Source: Adapted from community discussion — TheRealManish

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6. Question 6 · 300 in bank

   A cloud engineer needs to block the IP address 192.168.10.50 from accessing a Linux server. Which of the following commands will achieve this goal?

   • Aiptables -F INPUT -j 192.168.10.50 -m DROP
   • Biptables -A INPUT -s 192.168.10.30 -j DROP
   • Ciptables -i INPUT --ipv4 192.168.10.50 -z DROP
   • Diptables -j INPUT 192.168.10.50 -p DROP

   Show answer

   Answer: B

   Explanation

   MissAllen is right, B is the answer here. "-A" appends the rule, "-s" is source address, and "-j" is the action if the rule is matched, so DROP

   Source: Adapted from community discussion — Ckl22

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7. Question 7 · 300 in bank

   Select 2

   A Linux systems administrator is configuring a new filesystem that needs the capability to be mounted persistently across reboots. Which of the following commands will accomplish this task? (Choose two.)

   • Adf -h /data
   • Bmkfs.ext4 /dev/sdc1
   • Cfsck /dev/sdc1
   • Dfdisk -l /dev/sdc1
   • Eecho "/data /dev/sdc1 ext4 defaults 0 0" >> /etc/fstab
   • Fecho "/dev/sdc1 /data ext4 defaults 0 0" >> /etc/fstab

   Show answer

   Answer: BF

   Explanation

   mkfs.ext4 /dev/sdc1 - This command creates the ext4 filesystem on the device /dev/sdc1. echo "/dev/sdc1 /data ext4 defaults 0 0" >> /etc/fstab - This command appends a line to the /etc/fstab file that specifies the device to be mounted at a specific mount point persistently across reboots. After running these commands, the new filesystem will be created and automatically mounted at the specified mount point every time the system reboots.

   Source: Adapted from community discussion — linux_admin

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8. Question 8 · 300 in bank

   Select 2

   A Linux administrator is alerted to a storage capacity issue on a server without a specific mount point or directory. Which of the following commands would be MOST helpful for troubleshooting? (Choose two.)

   • Aparted
   • Bdf
   • Cmount
   • Ddu
   • Efdisk
   • Fdd
   • Gls

   Show answer

   Answer: BD

   Explanation

   B. df - This command shows the disk space usage of all mounted filesystems on the system. It will help identify the filesystems that are consuming the most space and the available space left. D. du - This command shows the disk usage of files and directories, including hidden files. It can help identify which directories or files are using the most space on the filesystem.

   Source: Adapted from community discussion — linux_admin

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9. Question 9 · 300 in bank

   A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented. In order to go back to the program, which of the following commands can the administrator use?

   • Afg
   • Bsu
   • Cbg
   • Ded

   Show answer

   Answer: A

   Explanation

   The command the administrator can use to go back to the program is fg. A. fg - This command brings a job to the foreground. In this case, the job is the program that was suspended using Ctrl+Z. B. su - This command is used to switch to another user account. C. bg - This command starts a suspended job in the background. It is not useful in this case because the administrator wants to bring the job to the foreground. D. ed - This command starts the ed text editor. It is not useful in this case because the administrator wants to resume the program that was suspended.

   Source: Adapted from community discussion — linux_admin

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10. Question 10 · 300 in bank

    A systems administrator received a notification that a system is performing slowly. When running the top command, the systems administrator can see the following values:

    

    Which of the following commands will the administrator most likely run NEXT?

    • Avmstat
    • Bstrace
    • Chtop
    • Dlsof

    Show answer

    Answer: A

    Explanation

    Based on the output of the top command, which shows a high percentage of CPU time spent on I/O wait (%wa), the command that the administrator would most likely run next is vmstat. A. vmstat - This command provides a summary of system memory, CPU usage, and I/O statistics. It can be used to identify I/O bottlenecks and other performance issues. B. strace - This command is used to trace system calls and signals made by a process. It is not directly relevant to identifying I/O bottlenecks. C. htop - This command is an interactive process viewer that is similar to top but provides more features and capabilities. It may be useful for more detailed analysis of system performance, but is not necessary in this case. D. lsof - This command lists open files and can be used to identify processes that are holding open file handles. It is not directly relevant to identifying I/O bottlenecks.

    Source: Adapted from community discussion — linux_admin

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XK0-005 practice, question 1. 300 questions available.