A systems administrator is attempting to connect via RDP to a server that is running Windows. However, the systems administrator cannot connect to the machine via RDP to reboot it and apply updates…

ILO (HP Integrated Lights-Out) and iDRAC (Dell Integrated Remote Access Controller) are out-of-band management interfaces embedded in server hardware that provide remote KVM access, virtual media, and power control independent of the server's operating system. Because they operate on a dedicated management plane separate from the main OS, they remain accessible even when the OS is unresponsive or network services like RDP are unavailable. This makes them the correct tool for remotely rebooting and managing an inaccessible server.

TCP/IP is a network protocol suite, not a remote access or management tool, and cannot be used to access a server when RDP is unavailable.

SSH and SCP require the server's operating system and network stack to be responsive; if RDP cannot connect, SSH is equally likely to fail for the same underlying reasons.

VNC requires the OS and a running VNC service to connect, and VPN is a network tunnel technology - neither provides out-of-band hardware-level access to an unresponsive server.