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XK0-006 Sample Questions Answers, New XK0-006 Exam Sample

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CompTIA Linux+ Certification Exam Sample Questions (Q37-Q42):

NEW QUESTION # 37
A systems administrator receives reports about connection issues to a secure web server. Given the following firewall and web server outputs:
Firewall output:
Status: active
To Action From
443/tcp DENY Anywhere
443/tcp (v6) DENY Anywhere (v6)
Web server output:
tcp LISTEN 0 4096 *:443 :
Which of the following commands best resolves this issue?

A. ufw delete deny https/tcp
B. ufw allow 80/tcp
C. ufw disable
D. ufw allow 4096/tcp

Answer: A

Explanation:
This scenario involves firewall configuration and service accessibility, which falls under the Security domain of the CompTIA Linux+ V8 objectives. The key to resolving this issue is interpreting both the firewall output and the web server status correctly.
The web server output shows that the service is actively listening on TCP port 443, which is the standard port for HTTPS (secure web traffic). The line tcp LISTEN 0 4096 *:443 *:* confirms that the web server is running properly and is ready to accept incoming connections on port 443 from any interface. This indicates that the problem is not with the web server configuration itself.
However, the firewall output clearly shows that incoming connections to port 443 are being blocked. The rules 443/tcp DENY Anywhere and 443/tcp (v6) DENY Anywhere (v6) indicate that the Uncomplicated Firewall (UFW) is explicitly denying HTTPS traffic for both IPv4 and IPv6. As a result, external clients cannot establish a secure connection to the server, even though the service is running correctly.
To resolve this issue securely and correctly, the administrator must remove the firewall rule that denies HTTPS traffic. Option C, ufw delete deny https/tcp, directly removes the blocking rule while preserving the rest of the firewall configuration. This aligns with Linux+ best practices, which emphasize making precise firewall changes rather than disabling security controls entirely.
The other options are incorrect. Option A, ufw disable, would completely turn off the firewall, creating a significant security risk. Option B, ufw allow 80/tcp, only opens HTTP traffic on port 80 and does not resolve HTTPS connectivity issues. Option D, ufw allow 4096/tcp, incorrectly attempts to open an internal socket backlog value rather than a valid service port.
Therefore, the correct and most secure solution is C.

NEW QUESTION # 38
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

Answer: B

Explanation:
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

NEW QUESTION # 39
Which of the following best describes a use case for playbooks in a Linux system?

A. To provide the security information required for a container
B. To provide the storage volume information required for a pod
C. To provide the instructions for implementing version control on a repository
D. To provide a set of tasks and configurations to deploy an application

Answer: D

Explanation:
In the context of Linux automation and orchestration, playbooks are most commonly associated with configuration management tools such as Ansible, which is explicitly referenced in the CompTIA Linux+ V8 objectives. Playbooks are written in YAML and are designed to define a series of tasks, configurations, and desired system states that should be applied to one or more Linux systems in a repeatable and automated manner.
A primary use case for playbooks is application deployment and system configuration automation.
Playbooks allow administrators to specify tasks such as installing packages, configuring services, managing users, setting permissions, deploying application files, and starting or enabling services. This aligns directly with option A, which accurately describes playbooks as a method to provide a set of tasks and configurations required to deploy an application consistently across environments.
The remaining options are not accurate representations of playbook functionality. Option B refers to version control implementation, which is handled by tools like Git and is not the purpose of playbooks themselves, although playbooks may be stored in version control systems. Option C describes container security information, which is typically managed through container runtime configurations, secrets, or security policies rather than playbooks. Option D refers to storage volume information for a pod, which is specific to Kubernetes manifests and not a general Linux playbook use case.
According to Linux+ V8 documentation, automation tools and playbooks help reduce human error, improve consistency, and support Infrastructure as Code (IaC) practices. Playbooks are a key mechanism for orchestrating multi-step operations across multiple systems, making them essential for modern Linux system administration.
Therefore, the correct answer is A, as it best describes the practical and documented use case for playbooks in a Linux system.

NEW QUESTION # 40
Which of the following best describes the role of initrd?

A. It is required to connect to the system via SSH.
B. It contains trusted certificates and secret keys of the system.
C. It contains basic kernel modules and drivers required to start the system.
D. It is required to initialize a random device within a Linux system.

Answer: C

Explanation:
initrd (initial ramdisk) provides essential kernel modules and drivers (e.g., for storage and filesystems) needed during the early boot process before the root filesystem is mounted.

NEW QUESTION # 41
A systems administrator wants to prevent the current contents of a file from being overwritten and wants to allow new additions at the end of the file. Which of the following commands should the administrator use?

A. setfacl -m m::t file
B. setenforce file
C. chmod +t file
D. chattr +a file

Answer: D

Explanation:
The chattr +a command sets the append-only attribute on a file. This prevents overwriting or deletion of existing contents, while still allowing new data to be appended to the end of the file.

NEW QUESTION # 42
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