User security is also extremely important. User security means keeping the user in their own little virtual world. If a user is kept within these confines they will probably not cause as many problems on the system as they would if they had free reign of the server. It is all too common to hear of stories where Joe in Marketing started browsing around the network and read some private letters that Judy over in Accounting wrote. For reasons like these, it is critical that you are aware and careful of who is added to the Administrators group.
Network security is one of the biggest threats.
Due to the wild growth of the Internet, network security has become a growing issue of system administers. With the popularity of the Internet, and the ease of getting on the 'Net, any sufficiently talented sixteen year old can break into a computer on the other side of the world from his bedroom. Network security involves protecting the network from remote attacks by setting up firewalls, packet filtering methods, intrusion detection systems, and constantly checking the network for leaks. The FAT File system is used by DOS and is supported by all the other operating systems. It is simple, reliable, and uses little storage.