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CompTIA Linux+ practice test free: exam XK0-004
XK0-004Q&As
Q 1
A Linux administrator needs to disable the Sendmail service on a Linux server and prevent it from being started manually and during boot.
Which of the following is the BEST command to do this?
A. systemctl reset-failed sendmail
B. systemctl mask sendmail
C. systemctl stop sendmail
D. systemctl disable sendmail
Correct Answer: C
Q 2
A Linux administrator has installed a web application firewall in front of a web server running on HTTP port 8080 and successfully started the HTTP server. However, after opening the application URL in an Internet browser, the administrator discovered that the application does not work. The administrator performed the following diagnostic steps:
Output of sysctl -a command:
Output of iptables -L command:
A. sysctl -w net.ipv4.ip_forward=1 then run sysctl -w /etc/sysctl.conf to enable the change
B. Edit /etc/sysctl.conf file and add net.ipv4.ip_forward = 1 then run sysctl -p /etc/ sysctl.conf to enable the change
C. Add iptables rule iptables -A INPUT -m state –state NEW -p tcp –dport 8080 -j then restart httpd daemon
D. Add iptables rule iptables -A FORWARD-m state –state NEW -p tcp –dport 8080 -j ACCEPT then restart httpd daemon
Correct Answer: D
Q 3
A Linux administrator opens a ticket to have an external hard drive mounted. As a security policy, external storage kernel modules are disabled.
Which of the following is the BEST command for adding the proper kernel module to enable external storage modules?
A. rmmod /lib/modules/3.6.12-100-generic/kernel/drivers/usb/storage/usb- storage.ko
B. modinfo /lib/modules/3.6.12-100-generic/kernel/drivers/usb/storage/usb- storage.ko
C. depmod /lib/modules/3.6.12-100-generic/kernel/drivers/usb/storage/usb- storage.ko
D. insmod /lib/modules/3.6.12-100-generic/kernel/drivers/usb/storage/usb- storage.ko
Correct Answer: D
Reference: https://www.cyberciti.biz/faq/linux-how-to-load-a-kernel-module-automatically-at-boot-time/
Q 4
A Linux administrator needs the “tech” account to have the option to run elevated commands as root. Which of the following commands would BEST meet this goal?
A. $ su – tech -c “/bin/bash”
B. # usermod -aG wheel tech
C. # sudo -i tech
D. # groupadd -u tech -g root
Correct Answer: B
Q 5
A user is reporting unusual slowness when trying to transfer a large file to an NFS server from a workstation. The administrator runs tracepath and gets the following output:
Which of the following BEST describes the issue and a possible solution?
A. The path MTU is lower than the source MTU. Reduce the source MTU setting.
B. There is latency at the storage device. Work with the storage team to correct the issue.
C. There is latency on an intermediate router. Increase the path MTU to compensate.
D. There are dropped packets at an intermediate router. Work with the network team to correct the issue.
Correct Answer: A
Q 6
A systems administrator is implementing disk quotas on /home. During the process, the administrator receives the following error:
Cannot find filesystem to check or filesystem not mounted with user quota option.
Which of the following is the correct order of steps the administrator should follow to resolve this error?
A. 1. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it.
2. Remount /home.
3. Create the quota database files and generate the disk usage table.
4. Assign user quota policies.
B. 1. Create the quota database files and generate the disk usage table.
2. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it.
3. Remount /home.
4. Assign user quota policies.
C. 1. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it.
2. Create the quota database files and generate the disk usage table.
3. Remount /home.
4. Assign user quota policies.
D. 1. Assign user quota policies.
2. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it.
3. Create the quota database files and generate the disk usage table.
4. Remount /home.
Correct Answer: A
Reference: https://www.howtoforge.com/community/threads/quotacheck-cannot-find-filesystem-to- check.25954/
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