PDF XK0-005 VCE & VALID TEST XK0-005 FEE

PDF XK0-005 VCE & Valid Test XK0-005 Fee

PDF XK0-005 VCE & Valid Test XK0-005 Fee

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CompTIA Linux+ Certification Exam Sample Questions (Q130-Q135):

NEW QUESTION # 130
A systems administrator created a user cron to run a scheduled database backup cronjob on the server at 1 a.
m. every day. The following is the cronjob syntax:
0 1 * * * /bin/sh backup.sh
The backups, however, are not being created. When checking the crontab file, the administrator sees the following error:
/var/spool/cron/crontab/cron: Permission denied
Which of the following will permit the cronjob to execute?

  • A. Giving cron ownership of the file /usr/bin/crontab
  • B. Running sudo crontab -u cron -e to edit the file with sudo
  • C. Creating the file cron.allow and adding user cron to it
  • D. Running sudo cron restart to activate the cronjob

Answer: C

Explanation:
The error indicates that the cron user does not have permission to run the cronjob. Creating a cron.allow file and adding the user cron to it will allow that user to run cronjobs. The cron.allow file is a security feature that controls which users are allowed to use cron.


NEW QUESTION # 131
A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following output:

Given there is a single CPU in the sever, which of the following is causing the slowness?

  • A. The memory is exhausted.
  • B. The processes are paging.
  • C. The system is running out of swap space.
  • D. The CPU is overloaded.

Answer: D

Explanation:
The slowness is caused by the CPU being overloaded. The iostat command shows that the CPU utilization is 100%, which means that there are more processes competing for CPU time than the CPU can handle. The other options are incorrect because:
The system is not running out of swap space, as shown by the iostat command, which shows that there is no swap activity (si and so columns are zero). The memory is not exhausted, as shown by the free -m command, which shows that there is still available memory (avail column) and free buffer/cache memory (buff/cache column). The processes are not paging, as shown by the vmstat command, which shows that there are no major page faults (majflt column) and no swap activity (si and so columns).


NEW QUESTION # 132
One leg of an LVM-mirrored volume failed due to the underlying physical volume, and a systems administrator is troubleshooting the issue. The following output has been provided:

Given this scenario, which of the following should the administrator do to recover this volume?

  • A. Reboot the server. The volume will automatically go back to linear mode.
  • B. Reboot the server. The volume will revert to stripe mode.
  • C. Replace the failed drive and reconfigure the mirror.
  • D. Recreate the logical volume.

Answer: C

Explanation:
Explanation
The administrator should replace the failed drive and reconfigure the mirror to recover the volume. The LVM (Logical Volume Manager) is a tool for managing disk space on Linux systems. The LVM allows the administrator to create logical volumes that span across multiple physical volumes, such as hard disks or partitions. The LVM also supports different types of logical volumes, such as linear, striped, or mirrored. A mirrored logical volume is a type of logical volume that creates a copy of the data on another physical volume, providing redundancy and fault tolerance. The output shows that the logical volume is mirrored and that one leg of the mirror has failed due to the underlying physical volume. This means that one of the physical volumes that contains the data of the logical volume is damaged or missing. This can cause data loss and performance degradation. The administrator should replace the failed drive and reconfigure the mirror to recover the volume. The administrator should identify the failed physical volume by using commands such as pvdisplay, vgdisplay, or lvdisplay. The administrator should then remove the failed physical volume from the volume group by using the vgreduce command. The administrator should then install a new drive and create a new physical volume by using the pvcreate command. The administrator should then add the new physical volume to the volume group by using the vgextend command. The administrator should then reconfigure the mirror by using the lvconvert command. The administrator should replace the failed drive and reconfigure the mirror to recover the volume. This is the correct answer to the question. The other options are incorrect because they either do not recover the volume (reboot the server. The volume will automatically go back to linear mode or reboot the server. The volume will revert to stripe mode) or do not preserve the data of the volume (recreate the logical volume). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Storage, pages 333-334.


NEW QUESTION # 133
A Linux administrator has installed a web server, a database server, and a web application on a server. The web application should be active in order to render the web pages. After the administrator restarts the server, the website displays the following message in the browser: Error establishing a database connection. The Linux administrator reviews the following relevant output from the systemd init files:

The administrator needs to ensure that the database is available before the web application is started. Which of the following should the administrator add to the HTTP server .service file to accomplish this task?

  • A. WANTEDBY=mariadb.service
  • B. TRIGGERS=mariadb.service
  • C. ONFAILURE=mariadb.service
  • D. REQUIRES=mariadb.service

Answer: D

Explanation:
The administrator should add REQUIRES=mariadb.service to the HTTP server .service file to ensure that the database is available before the web application is started. This directive specifies that the HTTP server unit requires the MariaDB server unit to be started before it can run. If the MariaDB server unit fails to start or stops for any reason, the HTTP server unit will also fail or stop. This way, the dependency between the web application and the database is enforced by systemd.
The other options are not correct directives for accomplishing this task. TRIGGERS=mariadb.service is not a valid directive in systemd unit files. ONFAILURE=mariadb.service means that the HTTP server unit will start only if the MariaDB server unit fails, which is not what we want. WANTEDBY=mariadb.service means that the HTTP server unit will be started when the MariaDB server unit is enabled, but it does not imply a strong dependency or ordering relationship between them. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Services with systemd; systemd.unit(5) - Linux manual page


NEW QUESTION # 134
A Linux systems administrator is setting up a new web server and getting 404 - NOT FOUND errors while trying to access the web server pages from the browser. While working on the diagnosis of this issue, the Linux systems administrator executes the following commands:

Which of the following commands will BEST resolve this issue?

  • A. setsebool -P httpd_can_network_connect_db on
  • B. setenforce 0
  • C. sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
  • D. restorecon -R -v /var/www/html

Answer: D

Explanation:
The command restorecon -R -v /var/www/html will best resolve the issue. The issue is caused by the incorrect SELinux context of the web server files under the /var/www/html directory. The output of ls -Z /var/www
/html shows that the files have the type user_home_t, which is not allowed for web content. The command restorecon restores the default SELinux context of files based on the policy rules. The options - R and -v are used to apply the command recursively and verbosely. This command will change the type of the files to httpd_sys_content_t, which is the correct type for web content. This will allow the web server to access the files and serve the pages to the browser. The other options are incorrect because they either disable SELinux entirely (sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config or setenforce 0), which is not a good security practice, or enable an unnecessary boolean (setsebool -P
httpd_can_network_connect_db on), which is not related to the issue. References: CompTIA Linux+ (XK0-
005) Certification Study Guide, Chapter 18: Securing Linux Systems, page 535.


NEW QUESTION # 135
......

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