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CompTIA XK0-005 Exam Questions

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CompTIA Linux+ Exam

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CompTIA XK0-005 Sample Questions – Free Practice Test & Real Exam Prep

Question #1

A Linux system is having issues. Given the following outputs: # dig @192.168.2.2 mycomptiahost ; << >> DiG 9.9.4-RedHat-9.9.4-74.el7_6.1 << >> @192.168.2.2 mycomptiahost ; (1 server found) ;; global options: +cmd ;; connection timed out; no servers could be reached # nc -v 192.168.2.2 53 Ncat: Version 7.70 ( https://nmap.org/ncat ) Ncat: Connection timed out. # ping 192.168.2.2 PING 192.168.2.2 (192.168.2.2) 56(84) bytes of data. 64 bytes from 192.168.2.2: icmp_seq=1 ttl=117 time=4.94 ms 64 bytes from 192.168.2.2: icmp_seq=2 ttl=117 time=10.5 ms Which of the following best describes this issue? 

  • A. The DNS host is down.  
  • B. The name mycomptiahost does not exist in the DNS.  
  • C. The Linux engineer is using the wrong DNS port.  
  • D. The DNS service is currently not available or the corresponding port is blocked.  
Answer: D  

Explanation: The ping command shows that the Linux system can reach the DNS server at 192.168.2.2, so the DNS host is not down. The dig and nc commands show that the Linux system cannot connect to the DNS server on port 53, which is the standard port for DNS queries. This means that either the DNS service is not running on the DNS server, or there is a firewall or network device blocking the port 53 traffic. Therefore, the DNS service is currently not available or the corresponding port is blocked. Reference 1: How To Troubleshoot DNS Client Issues in Linux - RootUsers 2: 6 Best Tools to Troubleshoot DNS Issues in Linux - Tecmint 3: How To Troubleshoot DNS in Linux - OrcaCore 4: Fixing DNS Issues in Ubuntu 20.04 | DeviceTests

Question #2

A Linux user is trying to execute commands with sudo but is receiving the following error: $ sudo visudo >>> /etc/sudoers: syntax error near line 28 <<< sudo: parse error in /etc/sudoers near line 28 sudo: no valid sudoers sources found, quitting The following output is provided: # grep root /etc/shadow root :* LOCK *: 14600 :::::: Which of the following actions will resolve this issue? 

  • A. Log in directly using the root account and comment out line 28 from /etc/sudoers.  
  • B. Boot the system in single user mode and comment out line 28 from /etc/sudoers.  
  • C. Comment out line 28 from /etc/sudoers and try to use sudo again.  
  • D. Log in to the system using the other regular user, switch to root, and comment out line 28 from /etc/sudoers.
Answer: B  


Question #3

A systems administrator needs to remove a disk from a Linux server. The disk size is 500G, and it is the only one that size on that machine. Which of the following commands can the administrator use to find the corresponding device name?  

  • A. fdisk -V  
  • B. partprobe -a  
  • C. lsusb -t  
  • D. lsscsi -s  
Answer: D  

Explanation: The lsscsi command can list the SCSI devices on the system, along with their size and device name. The -s option shows the size of each device. The administrator can look for the device that has a size of 500G and note its device name. See lsscsi(8) - Linux man page and How to check Disk Interface Types in Linux. Reference 1: https://linux.die.net/man/lsscsi 2: https://www.golinuxcloud.com/check-disk-type-linux/  
Question #4

Following the migration from a disaster recovery site, a systems administrator wants a server to require a user to change credentials at initial login. Which of the following commands should be used to ensure the aging attribute?

  • A. chage -d 2 user  
  • B. chage -d 0 user  
  • C. chage -E 0 user  
  • D. chage -d 1 user  
Answer: B  

Explanation: The chage command can be used to change the user password expiry information. The -d or --lastday option sets the last password change date. If the value is 0, the user will be forced to change the password at the next login. See chage command in Linux with examples and 10 chage command examples in Linux.

Question #5

A Linux administrator is troubleshooting a systemd mount unit file that is not working correctly. The file contains: [root@system] # cat mydocs.mount [Unit] Description=Mount point for My Documents drive [Mount] What=/dev/drv/disk/by-uuidafc9b2-ac34-ccff-88ae-297ab3c7ff34 Where=/home/user1/My Documents Options=defaults Type=xfs [Install] WantedBy=multi-user.target The administrator verifies the drive UUID correct, and user1 confirms the drive should be mounted as My Documents in the home directory. Which of the following can the administrator do to fix the issues with mounting the drive? (Select two). 

  • A. Rename the mount file to home-user1-My\x20Documents.mount.  
  • B. Rename the mount file to home-user1-my-documents.mount.  
  • C. Change the What entry to /dev/drv/disk/by-uuidafc9b2\-ac34\-ccff\-88ae\-297ab3c7ff34.  
  • D. Change the Where entry to Where=/home/user1/my\ documents.  
  • E. Change the Where entry to Where=/home/user1/My\x20Documents. 
  • F. Add quotes to the What and Where entries, such as What="/dev/drv/disk/by-uuidafc9b2-ac34- ccff-88ae-297ab3c7ff34" and Where="/home/user1/My Documents".
Answer: A,E  

Explanation: The mount unit file name and the Where entry must be escaped to handle spaces in the path. Reference The mount unit file name must be named after the mount point directory, with spaces replaced by \x20. See How to escape spaces in systemd unit files? and systemd.mount. The Where entry must use \x20 to escape spaces in the path. See systemd.mount and The workaround is to use /usr/bin/env followed by the path in quotes.. 
Question #6

A file called testfile has both uppercase and lowercase letters:  $ cat testfile ABCDEfgH IJKLmnoPQ abcdefgH ijklLMNopq A Linux administrator is tasked with converting testfile into all uppercase and writing it to a new file with the name uppercase. Which of the following commands will achieve this task?

  • A. tr '(A-Z}' '{a-z}' < testfile > uppercase  
  • B. echo testfile | tr "[Z-A]" "[z-a]" < testfile > uppercase  
  • C. cat testfile | tr '{z-a)' '{Z-A}' < testfile > uppercase  
  • D. tr '[a-z]' '[A-Z]' < testfile > uppercase  
Answer: D  

Explanation: This command will use the tr tool to translate all lowercase letters in the testfile to uppercase letters and write the output to the uppercase file. The first argument ˜[a-z] specifies the set of characters to be replaced, and the second argument ˜[A-Z] specifies the set of characters to replace with. The ˜< symbol redirects the input from the testfile, and the ˜> symbol redirects the output to the uppercase file12. Reference: 1: Linux Tr Command - javatpoint 2: Linux tr Command with Examples - phoenixNAP 

Question #7

The development team created a new branch with code changes that a Linux administrator needs to pull from the remote repository. When the administrator looks for the branch in Git, the branch in question is not visible. Which of the following commands should the Linux administrator run to refresh the branch information?

  • A. git fetch  
  • B. git checkout  
  • C. git clone  
  • D. git branch  
Answer: A  

Explanation: The git fetch command downloads commits, files, and refs from a remote repository into the local one. It also updates the remote-tracking branches, which are references to the state of the remote branches. By running git fetch, the administrator can see the new branch created by the development team and then use git checkout to switch to it12. Reference: 1: Git - git-fetch Documentation 2: Git Fetch | Atlassian Git Tutorial 

Question #8

Users are reporting that writes on a system configured with SSD drives have been taking longer than expected, but reads do not seem to be affected. A Linux systems administrator is investigating this issue and working on a solution. Which of the following should the administrator do to help solve the issue? 

  • A. Run the corresponding command to trim the SSD drives.  
  • B. Use fsck on the filesystem hosted on the SSD drives.  
  • C. Migrate to high-density SSD drives for increased performance.  
  • D. Reduce the amount of files on the SSD drives.  
Answer: A  

Explanation: TRIM is a feature that allows the operating system to inform the SSD which blocks of data are no longer in use and can be wiped internally. This helps to maintain the SSDs performance and endurance by preventing unnecessary write operations and reducing write amplification12. Running the corresponding command to trim the SSD drives, such as fstrim or blkdiscard on Linux, can help to solve the issue of slow writes by freeing up space and optimizing the SSDs internal garbage collection34. Reference: 1: What is SSD TRIM, why is it useful, and how to check whether it is turned on 2: How to Trim SSD in Windows 10 3: How to run fsck on an external drive with OS X? 4: How to Use the fsck Command on Linux 

Question #9

Which of the following will prevent non-root SSH access to a Linux server?  

  • A. Creating the /etc/nologin file  
  • B. Creating the /etc/nologin.allow file containing only a single line root  
  • C. Creating the /etc/nologin/login.deny file containing a single line +all  
  • D. Ensuring that /etc/pam.d/sshd includes account sufficient pam_nologin.so  
Answer: A  

Explanation: This file prevents any non-root user from logging in to the system, regardless of the authentication method. The contents of the file are displayed to the user before the login is terminated. This can be useful for system maintenance or security reasons12. Reference: 1: Creating the /etc/nologin File - Oracle 2: How to Restrict Log In Capabilities of Users on Ubuntu 

Question #10

A systems administrator is gathering information about a file type and the contents of a file. Which of the following commands should the administrator use to accomplish this task? 

  • A. file filename  
  • B. touch filename  
  • C. grep filename  
  • D. lsof filename  
Answer: A  

Explanation: The file command is used to determine the type of a file by examining its contents. It can recognize many different formats, such as text, binary, executable, compressed, image, audio, video, etc. It can also display some additional information about the file, such as encoding, size, dimensions, etc12 Reference: 1: file(1) - Linux manual page 2: How to use the file command in Linux 
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