Valid CompTIA XK0-006 Exam Test - Dumps XK0-006 Questions

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CompTIA Linux+ Certification Exam Sample Questions (Q169-Q174):

NEW QUESTION # 169
A systems administrator is decommissioning a service. Which of the following commands should the administrator use to make sure users cannot start the service again?

Answer: C

Explanation:
The correct answer is A. systemctl mask service because masking a service ensures that it cannot be started manually or automatically under any circumstances. When a service is masked, its unit file is linked to /dev
/null, effectively making it impossible for systemd to start the service. This is the most appropriate action when permanently decommissioning a service and ensuring that no user or process can restart it.
Option D (systemctl disable service) is a common distractor but is incorrect in this context. Disabling a service only prevents it from starting automatically at boot time; however, users with sufficient permissions can still manually start the service using systemctl start. Therefore, it does not fully meet the requirement of preventing the service from being started again.
Option B (systemctl kill service) is incorrect because it only terminates the currently running instance of the service. It does not prevent the service from being restarted later, either manually or automatically.
Option C (systemctl isolate service) is also incorrect. The isolate command is used to switch the system to a different target (similar to changing runlevels), not to manage the long-term availability of a specific service.
In Linux system administration, particularly within the Linux+ objectives, understanding the difference between stop, disable, and mask is critical. While stopping halts a service temporarily and disabling prevents automatic startup, masking is the strongest control, ensuring the service cannot be activated at all. This makes it the correct and secure choice when decommissioning services in production environments.


NEW QUESTION # 170
Which of the following can reduce the attack surface area in relation to Linux hardening?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Reducing the attack surface area in Linux hardening refers to limiting possible points of unauthorized access.
According to the CompTIA Linux+ Official Study Guide (Exam XK0-006), enforcing strong password policies is a critical aspect of security hardening. This practice ensures that user accounts are protected by passwords that are difficult to guess or crack, thus minimizing the risk of successful brute-force attacks.
Implementing password complexity requirements (such as minimum length, use of uppercase, lowercase, numbers, and special characters) directly addresses one of the primary vectors for unauthorized access.
Other options do not have a direct impact on reducing the attack surface:
A). Customizing the log-in banner serves as a legal notification and does not affect system vulnerabilities.
B). Reducing the number of directories created is not related to hardening or access control.
C). Extending the SSH startup timeout period may give attackers more time to attempt a connection and does not increase security.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: " Securing the System " , Section: " Implementing Password Policies " CompTIA Linux+ XK0-006 Exam Objectives, Domain 3.0: Security


NEW QUESTION # 171
A systems administrator is creating a backup copy of the /home/directory. Which of the following commands allows the administrator to archive and compress the directory at the same time?

Answer: C

Explanation:
The tar -cJf command creates (-c) an archive, compresses it with XZ (-J), and writes it to a file (- f). This allows archiving and compression of the /home/ directory in one step.


NEW QUESTION # 172
Which of the following describes the method of consolidating system events to a single location?

Answer: A

Explanation:
Consolidating system events from multiple sources into a single, centralized location is a key concept in Linux system administration and is explicitly covered under logging and monitoring topics in the CompTIA Linux+ V8 objectives. This method is known as log aggregation, making option A the correct answer.
Log aggregation refers to the practice of collecting logs generated by operating systems, services, applications, and network devices and storing them in a centralized repository. In Linux environments, logs may originate from systemd-journald, syslog, application-specific log files, containers, and cloud-based workloads. Aggregating these logs allows administrators to analyze events more efficiently, correlate issues across systems, and improve troubleshooting, auditing, and security monitoring.
Linux+ V8 documentation emphasizes centralized logging as a best practice in environments with multiple servers. Without log aggregation, administrators would need to log in to each system individually to inspect logs, which is inefficient and error-prone. Centralized solutions such as syslog servers, ELK/EFK stacks, and SIEM platforms enable real-time analysis, long-term retention, and alerting based on log data.
The other options do not describe log consolidation. Health checks are used to verify whether services or systems are operational but do not collect or store event data. Webhooks are HTTP-based callbacks used for event-driven automation and notifications, not for storing logs. Threshold monitoring involves generating alerts when metrics exceed defined limits, such as CPU or memory usage, but it does not centralize system event records.
Linux+ V8 stresses that effective log aggregation improves incident response, supports compliance requirements, and enhances system visibility. It is especially important for detecting security incidents, diagnosing failures, and performing root-cause analysis across distributed systems.


NEW QUESTION # 173
A Linux user needs to download the latest Debian image from a Docker repository. Which of the following commands makes this task possible?

Answer: A

Explanation:
The correct answer is B. docker image pull debian because it is the standard Docker command used to download container images from a remote repository such as Docker Hub. In Docker terminology, "pulling" an image means retrieving it from a remote registry and storing it locally so it can be used to create containers.
When a user executes docker image pull debian, Docker connects to the default registry (Docker Hub), searches for the official Debian image, and downloads the latest version (by default, the "latest" tag unless otherwise specified). This command is essential in container-based workflows and is commonly used in automation, orchestration, and DevOps environments.
Option A (docker image init debian) is incorrect because there is no valid Docker command called init under docker image. Initialization of containers is handled differently, typically via docker run.
Option C (docker image import debian) is incorrect because import is used to create a Docker image from a local tarball or file, not to download from a remote repository.
Option D (docker image save debian) is incorrect because save is used to export an existing local image into a tar archive for backup or transfer purposes. It does not download images.
From a Linux+ perspective, understanding container management is a key part of automation and orchestration. Commands like docker pull allow administrators to quickly provision environments, deploy applications, and maintain consistency across systems. This makes it a fundamental skill for modern Linux system administration and DevOps practices


NEW QUESTION # 174
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