XK0-005 Exam Dumps - CompTIA Linux+ Exam

The lsscsi command can list the SCSI devices on the system, along with their size and device name. The -s option shows the size of each device. The administrator can look for the device that has a size of 500G and note its device name. See lsscsi(8) - Linux man page and How to check Disk Interface Types in Linux.References1: https://linux.die.net/man/8/lsscsi 2: https://www.golinuxcloud.com/check-disk-type-linux/

An administrator accidentally installed the httpd RPM package along with several dependencies. Which of the following options is the best way for the administrator to revert the package

installation?

dnf clean all

rpm -e httpd

apt-get clean

yum history undo last

Answer: D

The yum history undo last command will undo the last transaction, which in this case is the installation of the httpd RPM package and its dependencies. This will remove the packages that were installed and restore the previous state of the system. See How to undo or redo yum transactions and yum history.References1: https://www.redhat.com/sysadmin/undo-redo-yum-transactions 2: https://man7.org/linux/man-pages/man8/yum.8.html#HISTORY

The best task to perform to resolve this issue is B. Remove the entry for portal.comptia.org from the local hosts file. This is because the local hosts file has a wrong entry that maps portal.comptia.org to 10.10.10.55, which is different from the actual IP address of 192.168.1.55 that is returned by the DNS server. This causes a mismatch and prevents the workstation from accessing the website. By removing or correcting the entry in the hosts file, the workstation will use the DNS server to resolve the domain name and access the website successfully.

To remove or edit the entry in the hosts file, you need to have root privileges and use a text editor such as vi or nano. For example, you can run the command:

sudo vi /etc/hosts

and delete or modify the line that says:

10.10.10.55 portal.comptia.org

Then save and exit the file.

To give the support group access to modify the config file while preserving the current ownership, the administrator can execute the command chmod 664 config ©. This will change the permissions of the config file to read and write for the owner and group, and read only for others. The owner and group of the file will remain as root and app respectively. The other commands will not achieve this task, but either change the group ownership, set an access control list, or set a setgid bit. References:

[CompTIA Linux+ Study Guide], Chapter 3: Working with Files, Section: Changing File Permissions

[How to Use chmod Command in Linux]

The error indicates that the application requires an X11 display, but the SSH session does not forward the X11 connection. To enable X11 forwarding, the administrator needs to use the ssh -X option, which requests X11 forwarding with authentication spoofing. This will set the DISPLAY environment variable on the remote host and allow the application to open a window on the local display.

References

CompTIA Linux+ (XK0-005) Certification Study Guide, page 314

Open a window on a remote X display (why “Cannot open display”)?, answer by Gilles ‘SO- stop being evil’

The Linux administrator should configure /etc/yum.repos.d/db.repo so that the requested packages can be installed. This file defines a custom repository for yum, which is a package manager for RPM-based systems. The file should contain information such as the name, baseurl, gpgcheck, and enabled options for the repository. By creating this file and enabling the repository, the administrator can use yum to install packages from the custom repository. The /etc/yum.conf file is the main configuration file for yum, but it does not define repositories. The /etc/ssh/sshd.conf file is the configuration file for sshd, which is a daemon that provides secure shell access to remote systems. The /etc/resolv.conf file is the configuration file for DNS resolution, which maps domain names to IP addresses. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 19: Managing Packages and Software, page 559.

Rugged appliances are small appliances with ruggedized hardware that use Gaia embedded as their operating system. Gaia embedded is a version of Gaia that is optimized for embedded devices such as Rugged appliances and Quantum Spark appliances. Gaia embedded supports features such as VPN, firewall, identity awareness, application control, URL filtering, and anti-bot. Gaia embedded does not use Centos Linux, Gaia, or Red Hat Enterprise Linux version 5 as their operating system. References: Check Point Rugged Appliance Datasheet, page 1.

The reason that the administrator is unable to perform the assigned duties is because the administrator is not a part of the correct group. This is option B.

Based on the image that you sent, I can see that the user comptia has a user ID and a group ID of 1000, and belongs to only one group, which is also comptia. However, the sudoers file, which defines the permissions for users to run commands as root or other users, does not include the comptia group in any of the entries. Therefore, the user comptia cannot use sudo to perform privileged functions on the system.

The other options are incorrect because:

A. The administrator needs a password reset.

This is not true, because the password aging information for the user comptia shows that the password was last changed on Oct 24, 2023, and it does not expire until Jan 22, 2024. There is no indication that the password is locked or expired.

C. The administrator did not update the sudo database.

This is not necessary, because the sudo database is automatically updated whenever the sudoers file is modified. There is no separate command to update the sudo database.

D. The administrator’s credentials need to be more complex.

This is not relevant, because the complexity of the credentials does not affect the ability to use sudo. The sudoers file does not specify any password policy for the users or groups that are allowed to use sudo.

The command ssh-copy-id user@server will allow the user to upload the public key to a remote server and enable passwordless login. The ssh-copy-id command is a tool for copying the public key to a remote server and appending it to the authorized_keys file, which is used for public key authentication. The command will also set the appropriate permissions on the remote server to ensure the security of the key. The command ssh-copy-id user@server will copy the public key of the user to the server and allow the user to log in without a password. This is the correct command to use for this task. The other options are incorrect because they either do not copy the public key (scp, rsync, or ssh-add) or do not use the correct syntax (scp ~/.ssh/id_rsa user@server:~/ instead of scp ~/.ssh/id_rsa.pub user@server:~/ or rsync ~ /.ssh/ user@server:~/ instead of rsync ~/.ssh/id_rsa.pub user@server:~/). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Managing Network Services, page 410.