CompTIA XK0-006 Online Practice Questions and Exam Preparation

CompTIA XK0-006 Online Questions & Answers

• Question 131:

  A Linux administrator discovers that a configured schedule is not running properly and needs to re-create the schedule. The task should run every Monday at 13:30 but only during the months of February, May, August, and November.

  Which of the following options should the administrator use?

  A. OnCalendar=Mon *-2,5,8,11 13:30:00
  B. OnCalendar=Mon *-Feb,*-May,*-Aug,*-Nov 13:30:00
  C. OnCalendar=*-2,5,8,11 Mon 13:30:00
  D. OnCalendar=Mon *-Feb *-May *-Aug *-Nov 13:30:00
  C. OnCalendar=*-2,5,8,11 Mon 13:30:00

• Question 132:

  A Linux administrator receives reports that an application hosted in a system is not completing tasks in the allocated time. The administrator connects to the system and obtains the following details:

  

  Which of the following actions can the administrator take to help speed up the jobs?

  A. Increase the amount of free memory available to the system.
  B. Increase the amount of CPU resources available to the system.
  C. Increase the amount of swap space available to the system.
  D. Increase the amount of disks available to the system.
  B. Increase the amount of CPU resources available to the system.

  ---

  Explanation

  This scenario represents a classic CPU-bound performance issue , which is covered under the Troubleshooting domain of CompTIA Linux+ V8. The most important indicator is the load average compared to the number of available CPU cores.

  The system has 4 CPU cores , as shown by nproc, but the load averages are consistently above 5 , with a peak of 7.75 . Load average reflects the number of processes either actively running on the CPU or waiting for CPU time. When the load average exceeds the number of CPU cores for extended periods, it indicates CPU contention. Processes must wait longer to be scheduled, resulting in delayed task completion.

  The memory statistics confirm that memory is not the bottleneck. free -h shows over 3.5 GiB of available memory , and swap usage is minimal. Additionally, vmstat shows no significant swap-in or swap-out activity and low I/O wait, ruling out memory pressure and disk bottlenecks.

  Increasing swap space would not help because the system is not memory constrained. Adding more disks would not address CPU scheduling delays. Increasing free memory is unnecessary because sufficient memory is already available.

  Linux+ V8 documentation emphasizes correlating load average with CPU core count to diagnose CPU saturation. The most effective way to speed up job execution in this case is to increase CPU resources , such as adding more vCPUs, moving the workload to a more powerful system, or distributing the workload across multiple systems.

  Therefore, the correct answer is B. Increase the amount of CPU resources available to the system.

• Question 133:

  A systems administrator needs to create a new service unit file. This new unit file is required to start when all services are running with the command-line interface only.

  Which of the following options should the administrator use to accomplish this task?

  A. WantedBy=basic.target
  B. WantedBy=network-online.target
  C. WantedBy=multi-user.target
  D. WantedBy=graphical.target
  C. WantedBy=multi-user.target

• Question 134:

  A systems administrator needs to compress log files using the .tar.bz2 format.

  Which of the following commands should the administrator use?

  A. tar -cvtf logs.car.bz2 /var/log/*
  B. tar -cvzf logs.tar.bz2 /var/log/*
  C. tar -cvjf logs.tar.bz2 /var/log/*
  D. tar -cvbf logs.tar.bz2 /var/log/*
  C. tar -cvjf logs.tar.bz2 /var/log/*

• Question 135:

  The application team is having issues accessing their data in their /app filesystem. Given the following outputs:

  

  Which of the following is the reason for this issue?

  A. The fllesystem was mounted incorrectly.
  B. The /etc/fstab configuration is wrong.
  C. A physical volume is missing.
  D. The data has been deleted.
  C. A physical volume is missing.

• Question 136:

  A Linux administrator needs to rebuild a container with the httpd service in order to change some default parameters.

  Which of the following should be the first command line in the Dockerfile?

  A. FROM httpd
  B. BASE httpd
  C. USE httpd
  D. INHERIT httpd
  A. FROM httpd

  ---

  Explanation

  In Docker, a Dockerfile is a script that contains instructions to build a container image. The first line in a Dockerfile is typically the FROM directive, which specifies the base image from which the container will be built. The correct syntax for specifying a base image is:rubyCopyEditFROM <image>:<tag>If no tag is provided, Docker will pull the latest version of the specified image by default.

  httpd is the official Apache HTTP Server image available in Docker Hub.

  The incorrect options:

  Thus, the correct answer is A. FROM httpd.

• Question 137:

  A Linux administrator tries to install Ansible in a Linux environment. One of the steps is to change the owner and the group of the directory /opt/Ansible and its contents.

  Which of the following commands will accomplish this task?

  A. groupmod -g Ansible -n /opt/Ansible
  B. chown -R Ansible:Ansible /opt/Ansible
  C. usermod -aG Ansible /opt/Ansible
  D. chmod -c /opt/Ansible
  B. chown -R Ansible:Ansible /opt/Ansible

• Question 138:

  Users report issues when trying to securely connect to a web server. The systems administrator receives the following outputs:

  firewall-cmd --list-all

  # (Only ports for ssh, cockpit, dhcp-client are listed.)

  netstat -an | grep LISTEN

  tcp 0 0 0.0.0.0:443 ... LISTEN

  Which of the following actions will fix this issue?

  A. Restarting the firewall service
  B. Starting the web application
  C. Restarting the web application
  D. Opening firewall port 443
  D. Opening firewall port 443

• Question 139:

  A Linux administrator attempts to log in to a server over SSH as root and receives the following error message: Permission denied, please try again. The administrator is able to log in to the console of the server directly with root and confirms the password is correct. The administrator reviews the configuration of the SSH service and gets the following output:

  

  Based on the above output, which of the following will most likely allow the administrator to log in over SSH to the server?

  A. Log out other user sessions because only one is allowed at a time.
  B. Enable PAM and configure the SSH module.
  C. Modify the SSH port to use 2222.
  D. Use a key to log in as root over SSH.
  D. Use a key to log in as root over SSH.

• Question 140:

  A Linux administrator is changing the default system umask. The newly created files should have the -rw-r----- permission, and the newly created directories should have the drwxr----- permission.

  Which of the following commands should the administrator use?

  A. umask 0035
  B. umask 0036
  C. umask 0037
  D. umask 0038
  C. umask 0037