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Home CompTIA XK0-004

CompTIA XK0-004 Exam Practice Questions (P. 3)

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Question #21
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?
  1. A
    nsswitch
  2. B
    faillock
  3. C
    pam_tally2
  4. D
    passwd

Correct Answer:
C

Question #22
A junior administrator needs to unload an older video kernel module.
Which of the following commands would BEST accomplish this task?
  1. A
    modprobe
  2. B
    insmod
  3. C
    rmmod
  4. D
    chmod
  5. E
    depmod

Correct Answer:
A
Reference:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Kernel_Administration_Guide/sec-Unloading_a_Module.html

Question #23
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?
  1. A
    iptables ג€"A ג€"p tcp ג€"d 192.168.10.24 ג€"-dport 22 ג€"j REJECT
  2. B
    iptables ג€"A ג€"p tcp ג€"d 192.168.10.24 ג€"-dport 22 ג€"j DROP
  3. C
    iptables ג€"A ג€"p tcp ג€"d 192.168.10.24 ג€"-dport 22 ג€"j FORWARD
  4. D
    iptables ג€"A ג€"p tcp ג€"d 192.168.10.24 ג€"-dport 22 ג€"j REFUSE

Correct Answer:
A
Reference:
https://www.golinuxhub.com/2014/03/how-to-allowblock-ssh-connection-from.html

Question #24
A junior Linux administrator is setting up system-wide configuration settings. The goal is to ensure the PATH environment variable includes the following locations for all users who log into a Linux system:

The administrator issues the following commands at the terminal:

Respectively, the output of these commands is as follows:

Given this output, which of the following would be the BEST action for the administrator to perform to address this issue?
  1. A
    Update the /etc/profile.d file using a text editor, navigate to the PATH element, add the missing locations, and run the bash_completion.sh script to update the changes.
  2. B
    Update the /etc/profile file using a text editor, navigate to the PATH element, add the missing locations and run the . /etc/profile command to update the changes.
  3. C
    Update the /etc/profile.d file using a text editor, navigate to the PATH element, add the missing locations, and reboot to update the changes.
  4. D
    Update the /etc/profile file using a text editor navigate to the PATH element, add the missing locations, and restart the bash process to update the changes.

Correct Answer:
B

Question #25
A Linux systems administrator needs to provision multiple web servers into separate regional datacenters. The systems architect has instructed the administrator to define the server infrastructure using a specific tool that consumes a text-based file.
Which of the following is the BEST reason to do this?
  1. A
    To document the infrastructure so it can be included in the system security plan
  2. B
    To ensure the administrator follows the planning phase of the systems development life cycle
  3. C
    To define the infrastructure so it can be provisioned consistently with minimal manual tasks
  4. D
    To validate user requirements have been met within each regional datacenter for compliance

Correct Answer:
B

Question #26
A Linux administrator needs to set permissions on an application with the following parameters:
✑ The owner of the application should be able to read, write, and execute the application.
✑ Members of the group should be able to read and execute the application.
✑ Everyone else should not have access to the application.
Which of the following commands would BEST accomplish these tasks?
  1. A
    chmod 710 <application name>
  2. B
    chmod 730 <application name>
  3. C
    chmod 750 <application name>
  4. D
    chmod 760 <application name>

Correct Answer:
C

Question #27
A junior Linux administrator is trying to verify connectivity to the remote host host1 and display round-trip statistics for ten ICMP requests.
Which of the following commands should the administrator execute?
  1. A
    ping ג€"c 10 host1
  2. B
    traceroute ג€"c 10 host1
  3. C
    netstat host1
  4. D
    pathping ג€"c 10 host1

Correct Answer:
A
Reference:
https://shapeshed.com/unix-ping/

Question #28
A junior Linux administrator is updating local name resolution to support IPv6. The administrator issues the command cat /etc/hosts and receives the following output:
127.0.0.1 localhost
Which of the following actions should the administrator perform to accomplish this task?
  1. A
    Modify the /etc/hosts file, and add the ipv6 localhost entry to the file.
  2. B
    Modify the /etc/hosts file, and add the ::1 localhost entry to the file.
  3. C
    Modify the /etc/hosts file, and add the ipv4 localhost entry to the file.
  4. D
    Modify the /etc/hosts file, and add the 0.0.0.0 localhost entry to the file.

Correct Answer:
B

Question #29
A Linux systems administrator needs to copy the contents of a directory named `working` on the local working system to a folder /var/www/html on a server named `corporate-web`.
Which of the following commands will allow the administrator to copy all the contents to the web server?
  1. A
    scp ג€"r working/* webuser@corporate-web:/var/www/html
  2. B
    tar working/* webuser@corporate-web:/var/www/html
  3. C
    cp ג€"r working/* webuser@corporate-web:/var/www/html
  4. D
    mv working webuser@corporate-web:/var/www/html

Correct Answer:
A
Reference:
https://unix.stackexchange.com/questions/232946/how-to-copy-all-files-from-a-directory-to-a-remote-directory-using-scp

Question #30
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?
  1. A
    mtr www.comptia.org
  2. B
    tracert www.comptia.org
  3. C
    ping www.comptia.org
  4. D
    netstat www.comptia.org

Correct Answer:
A

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