XK0-006: CompTIA Linux+ Certification Exam Dumps & PassGuide XK0-006 Examen

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CompTIA XK0-006 Prüfungsplan:

Thema	Einzelheiten
Thema 1	Security: Focuses on securing Linux systems through authentication, firewalls, OS hardening, account policies, cryptography, and compliance checks.
Thema 2	Automation, Orchestration, and Scripting: Covers task automation with tools like Ansible, shell and Python scripting, Git version control, and responsible AI-assisted development.
Thema 3	Troubleshooting: Addresses diagnosing and resolving issues across system health, hardware, storage, networking, security configurations, and performance optimization.
Thema 4	Services and User Management: Covers day-to-day Linux administration including file management, user accounts, processes, software, services, and container operations.

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CompTIA Linux+ Certification Exam XK0-006 Prüfungsfragen mit Lösungen (Q158-Q163):

158. Frage
A Linux administrator needs to create accounts for a list of new users. The user account names have been defined in the USER_LIST variable by executing the following:
USER_LIST= " alice bob charles "
Which of the following commands should the administrator use to successfully create the user accounts?

A. select username in " $USER_LIST " ; do useradd -m " $username " ; done
B. echo " $USER_LIST " | while username; do useradd -m " $username " ; done
C. for username in $USER_LIST; do useradd -m " $username " ; done
D. echo " $USER_LIST " | until username; do useradd -m " $username " ; done

Antwort: C

Begründung:
The correct answer is D. for username in $USER_LIST; do useradd -m " $username " ; done because it correctly iterates through each value in the USER_LIST variable and executes the useradd command for each user. In Bash scripting, a for loop is the most appropriate and commonly used construct for iterating over a list of space-separated values stored in a variable.
The variable USER_LIST= " alice bob charles " contains three usernames separated by spaces. When used in a for loop, Bash automatically splits the string into individual words, assigning each value to the variable username during each iteration. The useradd -m command then creates a new user account and also generates a home directory for each user, which is standard practice in Linux system administration.
Option A is incorrect because the syntax is invalid; a while loop requires a conditional expression or a read statement to process input, which is missing here. Option B is also incorrect because until loops require a condition and are not suitable for iterating over lists in this way. Option C is incorrect because the select statement is used for interactive menu-based selection, not for non-interactive batch processing, and quoting
$USER_LIST would treat the entire string as a single item.
From a Linux+ perspective, understanding shell scripting constructs such as loops is essential for automation and user management tasks. The for loop provides a simple and efficient way to perform repetitive administrative operations, such as creating multiple user accounts, ensuring consistency and saving time in system provisioning.

159. Frage
User1 reports " access denied " errors while trying to execute app. Given the following outputs:

Which of the following options will remediate this issue?

A. Moving app to a different folder
B. Providing execute permissions to user1 in the ACL
C. Modifying the permissions for others to grant read, write, and execute
D. Adding user1 to the wheel group

Antwort: B

Begründung:
According to the output of getfacl app, user1 has only " rw " (read and write) permissions, but lacks " x " (execute). Without execute permission, user1 cannot run the file. To allow user1 to execute app, you must update the ACL to add execute permission (e.g., setfacl -m u:user1:rwx app). Modifying " others " permissions (option B) is not secure or necessary, adding user1 to the wheel group (option C) is unrelated, and moving the file (option D) does not resolve permission issues.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 7: " Securing Linux Systems " , Section: " Managing File and Directory Permissions and ACLs " CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security

160. Frage
A Linux administrator just finished setting up passwordless SSH authentication between two nodes. However, upon test validation, the remote host prompts for a password. Given the following logs:

Which of the following is the most likely cause of the issue?

A. The authorized_keysfile does not have the correct security context to match SELinux policy.
B. The SELinux policy is incorrectly targeting the unconfined_ucontext.
C. The administrator forgot to restart the SSHD after creating the authorized_keysfile.
D. The authorized_keysfile has the incorrect root permissions assigned.

Antwort: A

Begründung:
The log shows avc: denied { read } caused by SELinux when sshd tries to access authorized_keys. The file has the wrong SELinux context (unconfined_u:object_r:home_root_t) instead of the expected context for SSH. This mismatch blocks SSH key authentication even though file permissions are correct. Adjusting the SELinux context (e.g., with restorecon) resolves the issue.

161. Frage
In the echo "profile-$num-$name"line of a shell script, the variable $numseems to not be expanding during execution. Which of the following notations ensures the value is expanded?

A. echo 'profile-$num-$name'
B. echo "profile-$(num)-$name"
C. echo "profile-'Snum'-$name"
D. echo "profile-${num}-$name"

Antwort: D

Begründung:
Using ${num} ensures correct variable expansion, especially when variables are adjacent to other characters or hyphens. This prevents ambiguity and guarantees $num is properly expanded within the string.

162. Frage
A Linux administrator attempts to log in to a server over SSH as root and receives the following error message: Permission denied, please try again. The administrator is able to log in to the console of the server directly with root and confirms the password is correct. The administrator reviews the configuration of the SSH service and gets the following output:

Based on the above output, which of the following will most likely allow the administrator to log in over SSH to the server?

A. Use a key to log in as root over SSH.
B. Enable PAM and configure the SSH module.
C. Modify the SSH port to use 2222.
D. Log out other user sessions because only one is allowed at a time.

Antwort: A

Begründung:
The SSH configuration option PermitRootLogin prohibit-password prevents the root user from logging in with password authentication. This setting means root cannot use a password to log in via SSH; only key- based authentication is permitted for root. The administrator can still log in as root locally, which is not affected by this SSH configuration. To allow SSH access as root, the administrator must use an SSH key instead of a password.
Other options:
A). MaxSessions controls the number of simultaneous SSH sessions but is not causing the login denial here.
B). PAM (Pluggable Authentication Modules) is disabled, but enabling it is not required for basic SSH authentication.
C). Changing the SSH port is unrelated to the authentication method issue.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: " Securing Linux " , Section: " Securing SSH Access " CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security

163. Frage
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