One of the most overlooked but perhaps most critical components of server security is the actual physical security of the server itself. The most secure, unbreakable web server is powerless if a malicious user can simply unplug it. Worse yet, someone logging in to a critical file server could potentially copy critical data or sabotage the machine directly.
Physical security is a must for any organization because it is the most common cause of security breaches. Despite this fact, many organizations have loose levels, or no levels, of physical security for their mission-critical servers. An understanding of what is required to secure the physical and login access to a server is a must.