CompTIA XK0-006 Online Practice Questions and Exam Preparation

CompTIA XK0-006 Online Questions & Answers

• Question 111:

  A Linux systems administrator has applied the necessary configuration to allow both HTTP and HTTPS through the firewall. However, the host is not responding on either HTTP or HTTPS. Given the output below, what is the issue?

  firewall-cmd --list-all-zones

  public (active)

  ...

  services: ssh

  ...

  internal

  ...

  services: http https ssh Which of the following best describes the reason the system is not responding on HTTP or HTTPS?

  A. The incorrect rules were configured on the firewall
  B. The interface has the incorrect routes configured
  C. The rules were added to the wrong zone
  C. The rules were added to the wrong zone

• Question 112:

  A systems administrator needs to check the size of the filesystem on the current application servers and ensure that the following filesystems are mounted:

  /var

  /var/log/audit

  /tmp

  /home/application

  Which of the following commands should the administrator use for these tasks?

  A. fdisk
  B. df
  C. du
  D. lsblk
  B. df

• Question 113:

  Which of the following Git commands would send committed changes to a remote repository?

  A. git stash
  B. git commit -a
  C. git push origin master
  D. git add .
  C. git push origin master

  ---

  Explanation

  git push origin master pushes committed changes to the remote repository. git stash temporarily saves changes but does not push them. git commit -a commits changes but does not send them to the remote repository. git add . stages changes but does not commit or push them.

  CompTIA Linux+ Official Study Guide, Chapter on Git and Version Control

• Question 114:

  Which of the following concepts describes the approach of keeping all configurations in a repository?

  A. Inventory
  B. Infrastructure as Code
  C. Orchestration
  D. Agentless deployment
  B. Infrastructure as Code

• Question 115:

  An administrator receives the following output while attempting to unmount a filesystem:

  umount /data1: target is busy.

  Which of the following commands should the administrator run next to determine why the filesystem is busy?

  A. ps -f /data1
  B. du -sh /data1
  C. top -d /data1
  D. lsof | grep /data1
  D. lsof | grep /data1

  ---

  Explanation

  Filesystem unmount failures are common troubleshooting scenarios covered in Linux+ V8. When the error "target is busy" appears, it means one or more processes are actively using files or directories within the mount point.

  The correct diagnostic command is lsof | grep /data1 . The lsof (list open files) utility displays all open files and the processes using them. Filtering the output with grep /data1 identifies exactly which processes are holding file descriptors on the filesystem, preventing it from being unmounted.

  The other options are incorrect. ps -f displays process information but does not show open file usage. du -sh calculates disk usage and does not identify active processes. top monitors system performance but cannot pinpoint filesystem locks.

  Linux+ V8 documentation emphasizes using lsof or fuser to identify resource locks before unmounting filesystems.

• Question 116:

  Which of the following is the main reason for setting up password expiry policies?

  A. To avoid using the same passwords repeatedly
  B. To mitigate the use of exposed passwords
  C. To force usage of passwordless authentication
  D. To increase password strength and complexity
  B. To mitigate the use of exposed passwords

  ---

  Explanation

  Password management is a core topic in the Security domain of CompTIA Linux+ V8. Password expiry policies are implemented to reduce the risk associated with long-lived credentials.

  The primary reason for enforcing password expiration is to mitigate the risk of exposed or compromised passwords. If a password is leaked through phishing, malware, keylogging, or data breaches, limiting its lifespan reduces the window of opportunity for attackers to exploit it. Requiring periodic password changes ensures that compromised credentials eventually become invalid.

  Option B correctly captures this security objective. Linux+ V8 documentation emphasizes minimizing credential exposure as a key principle of access control.

  The other options are secondary or incorrect. Avoiding password reuse and increasing complexity are addressed through password history and complexity policies, not expiration alone. Password expiry does not force passwordless authentication, making option C incorrect.

• Question 117:

  A newly hired Linux administrator needs to grant access to the Linux servers by generating a password-protected RSA key of 4096 bytes.

  Which of the following commands will accomplish this task?

  A. ssh-keygen -RPb 4096
  B. ssh-keygen -t rsa -b 4096
  C. ssh-keygen -k rsa -l 4096 -p
  D. ssh-keygen -t dsa -B 4096
  B. ssh-keygen -t rsa -b 4096

• Question 118:

  An organization's business office needs to collaborate on quarterly reports and asks the systems administrator to create a finance group. The administrator creates the following directory:

  drwxrwxr-x Business Business 4096 Oct 15 16:40 Q1 Which of the following commands will allow all members of the finance group to have group ownership of all files created in the Q1 directory while ensuring that members of the business group preserve access? (Select two).

  A. chgrp Finance Q1/
  B. chmod g+s Q1/
  C. chmod u+s Q1/
  D. chmod a+x Q1/
  E. chown Finance Q1/
  F. chmod g+x Q1/
  A. chgrp Finance Q1/
  B. chmod g+s Q1/

• Question 119:

  A systems administrator manages multiple Linux servers and needs to set up a reliable and secure way to handle the complexity of managing event records on the OS and application levels.

  Which of the following should the administrator do?

  A. Create an automated process to retrieve logs from the server by demand.
  B. Implement a centralized log aggregation solution.
  C. Configure daily automatic backups of logs to remote storage.
  D. Deploy log rotation procedures to manage the records.
  B. Implement a centralized log aggregation solution.

  ---

  Explanation

  Log management is a critical system management function highlighted in CompTIA Linux+ V8, particularly in multi-server environments. As the number of systems and applications grows, managing logs locally on each server becomes inefficient and error-prone.

  The best solution is to implement a centralized log aggregation solution , making option B correct. Centralized logging collects logs from multiple systems and applications into a single, secure location. This simplifies monitoring, searching, correlation, auditing, and incident response. Common solutions include syslog servers, ELK/EFK stacks, and SIEM platforms. Linux+ V8 documentation emphasizes centralized logging as a best practice for availability, troubleshooting, and security analysis. It enables administrators to detect patterns, investigate incidents, and maintain compliance more effectively than isolated log files.

  The other options are insufficient on their own. On-demand retrieval does not scale well. Log backups protect data but do not simplify analysis. Log rotation manages disk usage but does not address distributed log complexity.

• Question 120:

  A new database is installed on a server. To comply with the database vendor requirement, the huge page function should be set permanently.

  Which of the following commands will set this parameter?

  A. sysctl -a "vm.nr_hugepage=100"
  B. echo "vm.nr_hiigepage=100" >> /etc/sysconfig/hugepage.conf
  C. echo "nvm.nr_hugepage=100" >> /etc/modprobe.conf
  D. echo "vm.nr_hugepage=100" >> /etc/sysctl.conf
  D. echo "vm.nr_hugepage=100" >> /etc/sysctl.conf