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NEW QUESTION # 71
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: B
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 # 72
Which of the following commands should an administrator use to see a full hardware inventory of a Linux system?
Answer: D
Explanation:
dmidecode retrieves detailed hardware information from the system's DMI/SMBIOS, including BIOS, CPU, memory, and motherboard details, providing a full hardware inventory.
NEW QUESTION # 73
A Linux administrator notices that an application is having trouble connecting to an external database. Which of the following commands should the administrator use to validate the connection to the remote port exposed by a database server?
Answer: A
Explanation:
This command tests connectivity to a specific remote host and port, allowing the administrator to verify whether the database service port is reachable from the system.
NEW QUESTION # 74
A systems administrator attempts to edit a file as root, but receives the following error:
Which of the following commands allows the administrator to edit the file?
Answer: A
Explanation:
The lsattr output shows the immutable (i) attribute set on /etc/resolv.conf. This prevents any modifications, even by root. Running chattr -i removes the immutable flag, allowing the administrator to edit the file.
NEW QUESTION # 75
A systems administrator must provide privileged access to a specific user in a Linux system.
Which of the following commands should the administrator use?
Answer: B
Explanation:
Adding the user to the sudo group grants privileged access by allowing the user to execute commands with elevated permissions through sudo, which is the standard and supported method on Linux systems.
NEW QUESTION # 76
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