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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Related Certifications: | CompTIA Linux+ |
| Exam Format: | Performance-based, Multiple-choice |
| Passing Score: | 720 (on a scale of 100–900) |
| Real Exam Qty: | Maximum of 90 |
| Exam Price: | USD 348 |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online (via Pearson VUE) or In-person at Pearson VUE testing centers |
| Pre Condition: | No formal prerequisites; recommended 12 months of hands-on experience with Linux administration |
| Official Syllabus URL: | https://www.comptia.org/en-us/certifications/linux |
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NEW QUESTION # 192
Which of the following statements best describes Ansible?
Answer: C
Explanation:
Ansible is an automation and configuration management tool that uses human-readable YAML playbooks to define tasks, enabling consistent and agentless automation across systems.
NEW QUESTION # 193
An administrator receives reports that a web service is not responding. The administrator reviews the following outputs:
Which of the following is the reason the web service is not responding?
Answer: D
Explanation:
The error log shows "cannot load certificate key /etc/pki/nginx/private/server.key", but the listing reveals that server.key is located in /etc/pki/nginx/ rather than the expected /etc/pki/nginx/private/ directory. Since the file exists but not where Nginx is configured to look, moving it to the correct directory resolves the issue.
NEW QUESTION # 194
Which of the following best describes a use case for playbooks in a Linux system?
Answer: B
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 # 195
Application owners are reporting that their application stops responding after several days of running, and they need to restart it. A Linux administrator obtains the following details from the dmesg command:
invoked oom-killer
Call Trace:
out_of_memory
oom_kill_process
The application owners mentioned that resources to the system have been increased, and the error takes longer to appear. Which of the following best describes the reason the process is being terminated by OOM?
Answer: B
Explanation:
The correct answer is C. The application might have a memory leak because the dmesg output clearly shows that the Linux kernel is invoking the OOM (Out Of Memory) killer, which terminates processes when the system runs out of available memory. The presence of entries such as invoked oom-killer, out_of_memory, and oom_kill_process confirms that the system is exhausting its memory resources over time.
A key detail in the scenario is that the application runs for several days before failing, and when system resources (RAM) are increased, the issue takes longer to occur. This behavior is a classic indicator of a memory leak, where an application gradually consumes more memory without releasing it. Instead of stabilizing, memory usage continuously grows until it reaches the system limit, at which point the OOM killer terminates the process to prevent system instability.
Option A (CPU type is incompatible) is incorrect because CPU incompatibility would cause immediate execution failures, not delayed memory exhaustion. Option B (kernel panic) is incorrect because a kernel panic would crash the entire system, not selectively terminate a user-space process. Option D (swap configuration not correctly sized) is partially plausible but not the best answer; while insufficient swap can contribute to OOM conditions, it does not explain the gradual memory consumption pattern observed.
In Linux+ troubleshooting, identifying memory leaks is critical when dealing with long-running applications.
Administrators should monitor memory usage using tools like top, htop, or ps, and investigate application behavior. Applying patches, optimizing code, or restarting services periodically are common mitigation strategies, along with configuring appropriate memory and swap resources.
NEW QUESTION # 196
An administrator must secure an account for a user who is going on extended leave. Which of the following steps should the administrator take? (Choose two)
Answer: B,D
Explanation:
Comprehensive and Detailed 250 to 350 words of Explanation From Linux+ V8 documents:
Securing dormant or temporarily unused user accounts is a best practice emphasized in the Security domain of CompTIA Linux+ V8. When a user goes on extended leave, the goal is to prevent unauthorized access while preserving the user's data and account for future use.
The most effective approach is to disable authentication and interactive login access without deleting the account. Option D, running passwd -l user, locks the user's password by prepending an invalid character to the encrypted password in /etc/shadow. This prevents password-based authentication while retaining the account, files, and ownership information. Linux+ V8 documentation highlights password locking as a standard method for temporarily disabling accounts.
Option F, changing the user's shell to /sbin/nologin, further strengthens account security by preventing interactive shell access entirely. Even if another authentication mechanism were attempted, the user would be denied a login shell. This is a common defense-in-depth measure and is explicitly referenced in Linux+ V8 objectives for access control and account hardening.
The other options are incorrect or inappropriate. Option A (immutable files) does not prevent account access and may interfere with system operations. Option B defeats the purpose of securing an inactive account.
Option C deletes user data, which is unnecessary and risky. Option E has no security effect, as filesystem timestamps do not control access.
Linux+ V8 stresses that secure account management should be reversible, auditable, and minimally disruptive. Locking the password and disabling the login shell meet these criteria and are commonly used together in enterprise environments.
NEW QUESTION # 197
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