Rebirth XK0-004 Pack 2021

NEW QUESTION 1
A systems administrator observes high latency values when reaching a remote web server. Which of the following commands will help determine and isolate issues on the network side?

• A. mtr
• B. dig
• C. netstat
• D. route

Answer: A

NEW QUESTION 2
A user, jsmith, needs access to database files located on a server. Which of the following will add jsmith to the “dba” group and preserve existing group memberships?

• A. usermod –a –G dba jsmith
• B. usermod –g dba jsmith
• C. useradd –g dba jsmith
• D. groupmod dba –u jsmith

Answer: AC

Explanation:
According to the reference given below. Both AC is correct.

NEW QUESTION 3
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:

Output of netstat –nltop | grep "8080":

Which of the following is the NEXT step the administrator should perform to permanently fix the issue at the kernel level?

• 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

Answer: D

NEW QUESTION 4
Which of the following statements BEST represents what the term “agentless” means regarding orchestration?

• A. Installation of a tool is not required on the remote system to perform orchestration tasks
• B. It facilitates version control when using infrastructure as code during orchestration
• C. It automatically removes malware from the remote system during orchestration
• D. A tool can only be accessed remotely to perform orchestration tasks

Answer: A

NEW QUESTION 5
Which of the following would be the BEST solution for a systems administrator to access the graphical user environment of a Linux machine remotely?

• A. VNC
• B. KDE
• C. X11
• D. RPC

Answer: A

NEW QUESTION 6
A junior systems administrator created a new filesystem /dev/sda1 with mountpoint /data and added it to the
/etc/fstab for auto-mounting.
When the systems administrator tries to mount the file system, the system refuses. Given the output below:

Which of the following steps is necessary?

• A. Change the filesystem from /dev/sda1 to /dev/sda2 and reboot.
• B. Change the options to auto,dev,sync,rw,nosuid and run the mount -a command.
• C. Change the mount point to data and reboot.
• D. Change the dump column to 1 and run the mount -a command.

Answer: B

NEW QUESTION 7
A junior Linux administrator is installing patches using YUM. The administrator issues the following command:
yum list installed
The output of the command is as follows:

Given this scenario and the output, which of the following should the administrator do to address this issue?

• A. renice –n 9 –p 5180
• B. killall yum
• C. ps –ef | grep yum
• D. top | grep yum

Answer: C

NEW QUESTION 8
A systems administrator needs to retrieve specific fields from a csv file. Which of the following tools would accomplish this task?

• A. awk
• B. sort
• C. print
• D. echo

Answer: A

NEW QUESTION 9
A Linux systems administrator wants the ability to access systems remotely over SSH using RSA authentication. to which of the following files should the RSA token be added to allow this access?

• A. authorized_keys
• B. ~/.ssh/ssh_config
• C. id_rsa.pub
• D. known_hosts

Answer: C

NEW QUESTION 10
A systems administrator needs to install a new piece of hardware that requires a new driver. The driver should be manually installed. Which of the following describes the order of commands required to obtain module information, install the module, and check the log for any errors during module installation?

• A. lsmod, modprobe, modinfo
• B. modinfo, insmod, modprobe
• C. modinfo, insmod, dmesg
• D. lsmod, insmod, dmesg

Answer: A

NEW QUESTION 11
A user has connected a Bluetooth mouse to a computer, but it is not working properly. Which of the following commands should the systems administrator use to fix the issue?

• A. lsmod –i bluetooth
• B. insmod bluetooth
• C. modprobe –r bluetooth
• D. depmod –i bluetooth

Answer: C

NEW QUESTION 12
An administrator is attempting to block SSH connections to 192.168.10.24 using the Linux firewall. After implementing a rule, a connection refused error is displayed when attempting to SSH to 192.168.10.24.
Which of the following rules was MOST likely implemented?

• A. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j REJECT
• B. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j DROP
• C. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j FORWARD
• D. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j REFUSE

Answer: A

NEW QUESTION 13
An administrator is analyzing a Linux server which was recently hacked.
Which of the following will the administrator use to find all unsuccessful login attempts?

• A. nsswitch
• B. faillock
• C. pam_tally2
• D. passwd

Answer: C

NEW QUESTION 14
An administrator receives a warning about a file system filling up, and then identifies a large file located at /tmp/largelogfile. The administrator deletes the file, but no space is recovered on the file system.
Which of the following commands would BEST assists the administrator in identifying the problem?

• A. lsof | grep largelogfile
• B. pkill /tmp/largelogfile
• C. pgrep largelogfile
• D. ps –ef | grep largelogfile

Answer: A

NEW QUESTION 15
Which of the following configuration files should be modified to disable Ctrl-Alt-Del in Linux?

• A. /etc/inittab
• B. ~/.bash_profile
• C. /etc/securetty
• D. /etc/security/limits.conf

Answer: A

NEW QUESTION 16
A systems administrator has received reports of intermittent network connectivity to a particular website. Which of the following is the BEST command to use to characterize the location and type of failure over the course of several minutes?

• A. mtr www.comptia.org
• B. tracert www.comptia.org
• C. ping www.comptia.org
• D. netstat www.comptia.org

Answer: B

NEW QUESTION 17
A systems administrator suspects a process with a PID of 2864 is consuming resources at an alarming rate. The administrator uses the command renice -n -5 -p2864, but it does not solve the issue. Which of the
following commands should the administrator execute to correct the issue?

• A. nice -n 5 -p 2864
• B. nice -n -5 -p 2864
• C. renice -n 10 -p 2864
• D. renice -n -10 -p 2864

Answer: D

NEW QUESTION 18
A Linux administrator wants to obtain a list of files and subdirectories in the /etc directory that contain the word “services”. Once the files and subdirectories are discovered, they should be listed alphabetically in the /var/tmp/foundservices file. Which of the following shell scripts will accomplish this task?

• A. #/bin/bashfind /etc –name services | sort > /var/tmp/foundservices
• B. #/bin/bashlocate /etc –sort –name services > /var/tmp/foundservices
• C. #/bin/bashfind –name services –sort </var/tmp/foundservices
• D. #/bin/bashfind /etc –name services –sort > /var/tmp/foundservices

Answer: B

NEW QUESTION 19
All users are reporting that they cannot connect to the SFTP server. The administrator runs a scan:

Which of the following would allow the administrator to fix the problem?

• A. Allow SFTP connections on port 22 using /etc/sysconfig/iptables.
• B. Allow SFTP connections on port 20 and 21 using /etc/sysconfig/iptables.
• C. Allow SFTP connections on port 25 using /etc/sysconfig/iptables.
• D. Allow SFTP connections on port 1456 using /etc/sysconfig/iptables.

Answer: A

NEW QUESTION 20
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

Answer: D

NEW QUESTION 21
An administrator is troubleshooting an application that has failed to start after the server was rebooted. Noticing the data volume is not mounted, the administrator attempts to mount it and receives this error:

Upon checking the logical volume status, the administrator receives this information:

Which of the following can be said about the data logical volume, and how can this problem be resolved?

• A. The logical volume is not activ
• B. The administrator should make it active with lvchange -ay /dev/ datavg/datalv and then mount it.
• C. The logical volume file system has become corrupte
• D. The administrator should repair it with xfs_repair/dev/datavg/datalv and then mount it.
• E. The logical volume is OK but the /dev special files are missin
• F. The administrator should recreate them by running /dev/MAKEDEV.
• G. The file system is read-onl
• H. The administrator should remount it as read-write with the command mount - o remount.rw /data.

Answer: A

NEW QUESTION 22
Find the file named core and remove it from the system. INSTRUCTIONS
Type “help” to display a list of available commands.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 23
A Linux administrator needs to back up the folder /usr/domain, and the output must be a gzip compressed tar. Which of the following commands should be used?

• A. tar –cv domain.tar.gz /usr/domain
• B. tar –cvf /usr/domain domain.tar.gz
• C. tar –czvf domain.tar.gz /usr/domain
• D. tar –cxzv /usr/domain domain.tar.gz

Answer: C

NEW QUESTION 24
A Linux storage administrator wants to create a logical volume group. Which of the following commands is required to start the process?

• A. pvcreate
• B. vgcreate
• C. lvcreate
• D. mkfs.xfs

Answer: B

NEW QUESTION 25
Which of the following is modified to reconfigure the boot environment?

• A. grub-mkconfig
• B. grub.cfg
• C. update-grub
• D. grub2-mkconfig

Answer: C

NEW QUESTION 26
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