What technology can a system administrator use to troubleshoot remote systems from their desk?

A remote desktop connection allows a system administrator to remotely access and control another computer over a network. This technology enables the administrator to view the remote system's desktop as if they were sitting right in front of it, making it easier to troubleshoot issues, configure settings, and resolve any problems directly on the user's machine. The ability to interact with the graphical interface of the remote system is a critical advantage, especially for visual tasks or when running software that requires direct user interaction.

While other options such as a remote access VPN could facilitate access to the network where the remote system resides, and network monitoring tools can provide insights into the system's performance and health, they do not allow for direct interaction with the remote user's desktop. Terminal emulation is useful for accessing command-line interfaces but lacks the graphical capabilities of remote desktop connections. Therefore, the option of using a remote desktop connection stands out as the most effective solution for troubleshooting remote systems from a desk.