What needs to be configured on a server to allow remote power-on access?

To allow remote power-on access to a server, configuring Integrated Lights-Out (ILO) or Intelligent Management Controller (iDRAC) is essential. These management tools provide a way to remotely access and manage server hardware, including remote power management capabilities. They allow administrators to power the server on and off, monitor its status, and access the system's console from a remote location, independent of the operating system running on the server.

Using ILO or iDRAC, administrators can leverage features such as Virtual Console, which enables direct access to the server's interface, enabling them to send power commands securely over the network. This is particularly useful for data centers where physical access to servers may be limited or when needing to troubleshoot or reboot a server without being on-site.

The other options serve different purposes but do not specifically address the need for remote power-on capabilities. Configuring VPN access relates to secure remote connectivity but does not provide hardware management features needed for power control. A serial connection configuration might facilitate certain types of management or console access but is not as advanced as ILO or iDRAC for power control. Lastly, configuring the boot sequence pertains to the order of boot operations and does not enable remote power management functionalities.