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NEW QUESTION # 21
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 # 22
An administrator set up a new user account called "test". However, the user is unable to change their password. Given the following output:
Which of the following is the most likely cause of this issue?
Answer: D
Explanation:
For normal users to change their own password, /bin/passwd must have the SUID bit set (permissions should be -rwsr-xr-x). The SUID bit allows users to run the program with the permissions of the file owner (root), which is required to update /etc/shadow. The provided output shows /bin/passwd does not have the SUID bit (no 's' in the owner's execute field). As a result, user "test" receives an "Authentication token manipulation error". The password can be changed as root, which confirms it's a permissions/SUID issue.
NEW QUESTION # 23
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?
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 # 24
Users cannot access an application that is running inside containers. The administrator wants to validate whether the containers are running. Which of the following commands should the administrator use?
Answer: B
Explanation:
The docker ps command lists all running containers, allowing the administrator to verify whether the application's containers are active.
NEW QUESTION # 25
A Linux administrator needs to add a new HTTP service on the server. Which of the following commands allows other systems to communicate with the service after the system is restarted?
Answer: D
Explanation:
This command adds the HTTP service to the firewall's permanent configuration, ensuring the rule persists across system restarts and allows other systems to communicate with the service after reboot.
NEW QUESTION # 26
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