A Linux engineer is troubleshooting a newly added SCSI device for a Linux server that needed more disk space without rebooting. The engineer discovers that the new device is not visible by the Linux kernel in fdisk -l output. Which of the following commands should be used to rescan the entire SCSI bus?

Which of the following are classified as Linux GUI servers? (Choose two.)

Which of the following command should an administrator use to prevent users from starting the httpd service on a system-based Linux system?

A Linux administrator is updating iptables rules and is given the following tasks:
Output a list of iptables rules.
Remove all iptables rules.
Which of the following actions should be performed from the terminal console to accomplish these tasks?
(Choose two.)

Which of the following is commonly implemented in external devices to provide unique event-based two-factor authentication credentials when a system is already implementing username and password authentication?