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XK0-006 Exam Simulator | XK0-006 Examcollection Dumps Torrent

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CompTIA Linux+ Certification Exam Sample Questions (Q21-Q26):NEW QUESTION # 21
Which of the following best describes journald?
  • A. A system service that collects and stores logging data
  • B. A feature that creates crash dumps in case of kernel failure
  • C. A service responsible for keeping the filesystem journal
  • D. A service responsible for writing audit records to a disk
Answer: A
Explanation:
journald is part of systemd and is responsible for collecting, storing, and managing log data from various sources such as the kernel, services, and applications.

NEW QUESTION # 22
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?
  • A. The private key is not in the correct location and needs to be moved to the correct directory.
  • B. The private key needs to be renamed from server.crt to server, key so the service can find it.
  • C. The private key has the incorrect permissions and should be changed to 0755 for the service.
  • D. The private key does not match the public key, and both keys should be replaced.
Answer: A
Explanation:
This issue falls under the Troubleshooting domain of the CompTIA Linux+ V8 objectives, specifically service startup failures and certificate-related errors. The provided output clearly indicates that the NGINX service fails during startup due to an inability to locate the private key file.
The critical error message is:
cannot load certificate key "/etc/pki/nginx/private/server.key": No such file or directory This message confirms that NGINX is explicitly configured to look for the private key in the directory /etc/pki
/nginx/private/. However, the directory listing shows that the private directory exists but is empty, while the server.key file is located in /etc/pki/nginx/ instead. Because NGINX cannot find the private key at the configured path, the configuration test (nginx -t) fails, and systemd prevents the service from starting.
Option C correctly identifies the root cause: the private key is not in the correct location. Moving server.key into /etc/pki/nginx/private/ (or updating the NGINX configuration to match the current location) would resolve the issue. Linux+ V8 documentation stresses that service failures often result from misaligned configuration paths rather than corrupted files.
The other options are incorrect. Option A incorrectly refers to renaming a certificate file and does not address the path issue. Option B suggests a key mismatch, which would generate a different SSL error rather than a
"file not found" error. Option D is also incorrect because private keys should not have executable permissions like 0755; typically, they are restricted (for example, 0600) for security reasons.
Therefore, the web service is not responding because the private key file is not located in the directory expected by the NGINX configuration. The correct answer is C.

NEW QUESTION # 23
A DevOps engineer needs to create a local Git repository. Which of the following commands should the engineer use?
  • A. git init
  • B. git clone
  • C. git add
  • D. git config
Answer: A
Explanation:
Version control is a core DevOps practice, and CompTIA Linux+ V8 includes Git fundamentals as part of automation and orchestration objectives. To create a new local Git repository, the correct command is git init.
The git init command initializes a new Git repository in the current directory by creating a hidden .git directory. This directory contains all the metadata required for version control, including commit history, branches, configuration settings, and object storage. After running git init, the directory becomes a fully functional local repository ready to track files and commits.
The other options do not create a new repository. git clone is used to copy an existing remote repository to a local system, not to create a new one. git config is used to set Git configuration values such as username, email, or default editor. git add stages files for commit but only works after a repository has already been initialized.
Linux+ V8 documentation highlights git init as the foundational command for starting version control in new projects. This command is frequently used in DevOps workflows when creating infrastructure-as-code repositories, automation scripts, or application source trees from scratch.
By initializing a local repository, engineers can begin tracking changes, collaborating with others, and integrating Git into CI/CD pipelines. Therefore, the correct answer is A. git init.

NEW QUESTION # 24
Which of the following actions is required to establish passwordless SSH authentication?
  • A. Copy the public SSH key to the remote server.
  • B. Copy the private SSH key to the remote server.
  • C. Generate public and private keys on the remote server.
  • D. Copy the public and private keys to the remote server.
Answer: A
Explanation:
Copying the public SSH key to the remote server's authorized_keys file is all that's needed to enable passwordless SSH authentication.

NEW QUESTION # 25
Users cannot access a server after it has been restarted. At the server console, the administrator runs the following commands;

Which of the following is the cause of the issue?
  • A. The DNS entry does not have a valid IP address.
  • B. The SSH service has not been allowed on the firewall.
  • C. The wrong protocol is being used to connect to the web server.
  • D. The server load average is too high.
Answer: B
Explanation:
This issue is a classic example of post-reboot connectivity troubleshooting, which falls under the Troubleshooting domain of CompTIA Linux+ V8. The administrator has correctly gathered evidence using multiple diagnostic tools, allowing the root cause to be identified through correlation.
The ss -lnt output confirms that the SSH daemon is running and listening on TCP port 22. This eliminates the possibility that the SSH service failed to start after reboot. Additionally, the uptime output shows a very low load average, indicating that system performance is not a limiting factor. The successful ping test confirms that the server is reachable at the network layer and that DNS resolution and basic connectivity are functioning correctly.
The critical clue comes from the firewall configuration. The output of firewall-cmd --list-all shows that only specific services are allowed through the firewall, such as https, dns, and cockpit. The SSH service is notably absent. On systems using firewalld, services must be explicitly allowed, even if the daemon itself is running and listening on the correct port.
As a result, incoming SSH connection attempts are being blocked by the firewall, preventing users from accessing the server remotely after reboot. This aligns precisely with option B.
The other options are incorrect. DNS is functioning, as shown by successful ping responses. System load is low and not contributing to the issue. There is no indication that users are attempting to access the web server using an incorrect protocol.
Linux+ V8 documentation emphasizes that administrators must verify both service status and firewall rules when diagnosing access issues. In this case, allowing SSH with a command such as firewall-cmd --add- service=ssh --permanent followed by a reload would resolve the problem.

NEW QUESTION # 26
......
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