Explanation
An access control vestibule, or mantrap, is a type of physical access control that provides a space between two sets of interlocking doors. It is designed to prevent unauthorized individuals from following authorized individuals into facilities with controlled access, such as a check-in desk. The vestibule can be configured to limit the number of individuals who enter the controlled area and to verify their authorization for physical access1. The other options are incorrect because they are not as effective as an access control vestibule in facilitating the implementation of a check-in desk. Security guards, security cameras, and bollards are useful for monitoring, deterring, or preventing unauthorized access, but they do not provide the same level of control and verification as an access control vestibule

Explanation
The server administrator should use cable management to prevent network connectivity loss when pulling a server from the rack during maintenance. Cable management is a practice of organizing and securing the cables that connect various devices and components in a system. Cable management can help improve airflow, reduce clutter, prevent tangling, and avoid accidental disconnection or damage of cables. Cable management can be done using various tools and techniques, such as cable ties, cable trays, cable labels, cable organizers, or cable ducts.

Explanation
The correct answer is D. per-core.
The per-core licensing model was created by software companies in response to the increasing density of processors. This model is used for software that runs on servers with multi-core processors, and the licensing fee is based on the number of cores. This way, the software vendors can charge more for software that runs on servers with more processing power1

The concept of authentication is rooted in the principle of verifying identity, which is commonly broken down into three categories: "something you know" (like a password or PIN), "something you have" (such as a smart card or a security token), and "something you are" (biometric data, for example, fingerprints). The question asks for the authentication type defined by "something you have."

The fstab (/etc/fstab) (or file systems table) file is a system configuration file on Debian systems.
The fstab file typically lists all available disks and disk partitions, and indicates how they are to be initialized or otherwise integrated into the overall system's file system.
The etc/fstab file has /home as the DIR.. but when a df /home is asked for there is no /home directory underneath... only /dev/sda2. Therefore, we would need to mkdir a /home under the
/home directory.
# <file system> <dir> <type> <options> <dump> <pass>
10.10.0.10:/backups /var/backups nfs defaults 0 0
https://linuxize.com/post/how-to-mount-an-nfs-share-in-linux/