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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Exam Price: | $358 USD |
| Certificate Validity Period: | 3 years |
| Exam Format: | Multiple-choice, Performance-based questions |
| Real Exam Qty: | Up to 90 |
| Passing Score: | 720 (scale 100โ900) |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Related Certifications: | CompTIA Server+ CompTIA A+ CompTIA Network+ |
| Recommended Training: | CompTIA Official Study Materials CompTIA CertMaster Learn |
| Exam Registration: | CompTIA Official Registration Pearson VUE Exam Scheduling |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE testing centers |
| Pre Condition: | No mandatory prerequisites; 12 months of hands-on Linux experience or CompTIA A+/Network+/Server+ recommended |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 116
A systems administrator reviews the package management history and sees the following entries:
46 install httpd Install 9
47 update -y Upgrade 44
Which of the following commands should the administrator use to undo the installation of the httpd package from transaction 46?
Answer: C
Explanation:
The correct answer is B. yum history undo 46 because it directly reverses the specific transaction identified in the YUM history log. In Red Hat-based Linux distributions, the yum history feature allows administrators to view, manage, and undo past package operations. Each transaction is assigned a unique ID, which can be used to reverse changes accurately.
In this scenario, transaction 46 corresponds to the installation of the httpd package. Using the command yum history undo 46 will attempt to revert that exact transaction by removing the installed package and restoring the system to its previous state before that transaction occurred. This method is precise and preferred in environments where maintaining package consistency is critical.
Option A (yum remove httpd) is incorrect because although it removes the httpd package, it does not specifically reference the transaction history. It may not fully revert all dependencies or changes associated with the original installation transaction.
Option C (yum rollback 46) is incorrect because rollback is not a valid YUM command. The correct functionality is handled through the history undo or history rollback syntax, but rollback requires a different format (typically rolling back to a transaction ID, not specifying a single one in this way).
Option D (yum erase 46) is incorrect because erase expects a package name, not a transaction ID. Using a number like 46 would result in an error.
From a Linux+ system management perspective, understanding yum history commands is essential for package management, auditing, and troubleshooting. It allows administrators to safely reverse changes, ensuring system stability and proper configuration management.
NEW QUESTION # 117
Which of the following can be implemented with PAM to detect and block dictionary attacks?
Answer: B
Explanation:
Pluggable Authentication Modules (PAM) provide a flexible, centralized mechanism for managing authentication across various services in a Linux system. According to the CompTIA Linux+ V8 security domain, protecting against " dictionary attacks " and " brute-force " attempts is a critical hardening step. A dictionary attack involves an automated script attempting thousands of common passwords against a user account.
To mitigate this, administrators use pam_tally2 (or the newer pam_faillock on some systems). The pam_tally2 module is specifically designed to keep track of failed login attempts for each user. It can be configured in the PAM stack (such as /etc/pam.d/common-auth or /etc/pam.d/password-auth) to lock an account after a specified number of consecutive failed attempts (e.g., deny=5). Once the threshold is reached, the user is blocked from further attempts for a set period or until an administrator manually resets the counter. This effectively stops automated dictionary attacks from continuing indefinitely.
The other options serve different purposes. pam_limits (Option B) is used to set resource limits (like CPU time or number of open files) for users once they are already logged in. pam_unix (Option C) is the standard module for traditional /etc/passwd and /etc/shadow authentication. pam_ldap (Option D) allows the system to authenticate against a remote LDAP directory.
While these modules are part of the PAM ecosystem, only pam_tally2 is designed for tracking and acting upon failed login counts to block attacks.
NEW QUESTION # 118
A user reports recurrent issues with an application, which is currently operational. The systems administrator gathers the following outputs to diagnose the issue:
Which of the following is a possible cause of this issue?
Answer: D
Explanation:
The logs show repeated out-of-memory kills involving the mariadb process, and the memory statistics show sustained high memory usage with no swap configured. Since the application is currently running but repeatedly grows until the kernel kills it, the likely cause is a memory leak in the process.
NEW QUESTION # 119
Which of the following allows modules to be used in Python scripts?
Answer: D
Explanation:
This statement makes functions, classes, and variables from a module available for use within a Python script, enabling modular and reusable code.
NEW QUESTION # 120
Which of the following commands should an administrator use to convert a KVM disk file to a different format?
Answer: A
Explanation:
Virtualization management is part of Linux system administration and is included in Linux+ V8 objectives.
KVM virtual machines commonly use disk image formats such as qcow2, raw, or vmdk. Converting between these formats is a routine administrative task.
The correct tool for disk image conversion is qemu-img. This utility allows administrators to create, convert, resize, and inspect virtual disk images. For example, converting a qcow2 image to raw format can be accomplished using qemu-img convert. This capability is explicitly referenced in Linux+ V8 documentation related to virtualization tooling.
The other options are incorrect. qemu-kvm refers to the hypervisor component, not disk manipulation. qemu- ng is not a valid QEMU utility. qemu-io is used for low-level I/O testing and debugging, not image format conversion.
Therefore, the correct answer is D. qemu-img.
NEW QUESTION # 121
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