CompTIA XK0-005 Online Access

The configuration file shown in the image is written in YAML format, so the syntax formatter should support YAML to correct any issues with the file. YAML stands for YAML Ain’t Markup Language, and it is a human-readable data serialization language that uses indentation and colons to define key-value pairs. YAML supports various data types, such as scalars, sequences, mappings, anchors, aliases, and tags. The configuration file follows the rules and syntax of YAML, while the other options do not. Markdown is a lightweight markup language that uses plain text formatting to create rich text documents. XML is a markup language that uses tags to enclose elements and attributes. JSON is a data interchange format that uses curly braces to enclose objects and square brackets to enclose arrays. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 21: Automating Tasks with Ansible, page 591.

To terminate an unresponsive process immediately without waiting for a graceful shutdown, the administrator can use the command kill -SIGKILL 5545 (A). This will send a signal to the process with the PID 5545 that cannot be ignored or handled by the process, and force it to stop. The other commands will send different signals that may allow the process to perform some cleanup or termination actions, or may be ignored by the process. References:

[CompTIA Linux+ Study Guide], Chapter 6: Managing Processes, Section: Killing Processes

[How to Kill Processes in Linux]

The presence of a static entry in /etc/hosts for forces the system to use this IP address instead of querying DNS.

This prevents proper IPv6 (AAAA) resolution, as /etc/hosts only contains an IPv4 (A) record.

Removing this static entry allows the system to query DNS for both IPv4 and IPv6 records.

References:

Linux /etc/hosts File – Linux Documentation

This command will allow the systems administrator to change the password of another user account in the system. The sudo prefix will grant the administrator the necessary privileges to perform this action, and the passwd command will prompt for the new password for the specified user. For example, if the administrator wants to change the password of a user named tom, the command will look like this:

sudo passwd tom

The other options are incorrect because:

B. sudo userdel

This command will delete a user account from the system, not change its credentials. The userdel command removes the user’s entry from the /etc/passwd and /etc/shadow files, as well as deletes the user’s home directory and mail spool. This is not what the request asked for.

C. sudo chage

This command will change the password expiration and aging information for a user account, not its credentials. The chage command can be used to set or modify various parameters related to password aging, such as the minimum and maximum number of days between password changes, the number of days before password expiration to issue a warning, and so on. This is not what the request asked for.

D. sudo usermod

This command will modify various attributes of a user account, such as its login name, home directory, default shell, primary group, and so on. However, it cannot change the user’s password directly. To do that, the usermod command requires the -p option followed by an encrypted password string, which is not easy to generate manually. Therefore, this is not a practical way to change a user’s credentials.

References:

How to Change Account Passwords on Linux

How to Change a Password in Linux for Root and Other Users

CompTIA Linux+ Certification Exam Objectives