Usually this is done at high-volume installations (think, attaching and powering on a whole rack of servers at once) to automate installations. There is a wonderful tutorial which explains the details, but essentially you will need to ensure the network interface on the server is configured to pick up DHCP information and boot via PXE before the system is ready to perform the installation. There are a lot of other things which have to be configured on the network for this to work properly. Again, this is usually done on high-volume networks where this infrastructure is already in place specifically for this purpose.
Also note that you will need all of the answers to the questions the installer asks in advance. This isn't a process where the server loads the installer and you can SSH in to go through the usual interactive installation process. It's a fully unattended install (i.e. plug in the network, power on, and the server boots via PXE, mounts the installer and seeds itself with the answers needed to run an unattended install).
If it's just one server, I'd find a monitor, keyboard and mouse unless you're doing it for the experience. Once the initial install is finished, you can disconnect all of that and use it entirely over the network (assuming, as David mentioned, your system doesn't get upset if a keyboard isn't connected upon reboot; you can usually disable those warnings in the BIOS).