I'd go with Red Hat Enterprise Linux (RHEL).
A server that runs an operating system based on the Linux kernel.
Yes. RHEL is one of the best and secure server OS.
That heavily depends on what operation systems you want to use. A normal answer would be Windows XP, or a Linux OS.
The difficulties of using a Linux or Unix server are no different than an other server OS - they have the same challenges and difficulties.
They are all operating system.
Because it's incredibly secure, stable, fast, and proven to be efficient as server/supercomputer OS. It also has a better TCP/IP stack than windows.
knoppix could probably run on that, but it is primarily a live disk os, so it might have issues if you want to use it as a desktop or server
Windows Server Family, Linux are some examples. And also there are some routers that have the DHCP service enabled.
I assume you mean the OS on the server, if you want to go with windows your looking at windows server 2003 / 2008, windows small business server, windows home server. However alot of admins prefer linux, try FreeBSD.
Many operating systems are used on servers, including Linux, Windows Server, Solaris, FreeBSD, and Mac OS X Server.
The best Linux OS in customer reviews appears to be the Mint. Several reviewers recommend it as one of the best systems to install and use on your desktop.
I could be linux, unix, windows flavour depending upon the the natuire of applicationan and environment.