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This is a guest article by Shubra Sinha about Understanding Linux for 312-38: Network Security Administrator Exam . Linux, a free Unix-type operating system, was created in 1991 by Linus Torvalds, a student at the University of Helsinki. He started Linux by writing a kernel, which is the heart of the operating system. He created Linux with the assistance of developers around the world. Linux has been released under GNU General Public License and its source code is available to everyone without any cost. Therefore, anyone can work on it, change it, or enhance it. Many companies and individuals have released their own versions of operating systems based on the Linux kernel. Basic services and device drivers used by all other programs are provided by the Linux kernel. Some features of Linux are as follows: Multi-user Multitasking Graphical User Interface (GUI) Hardware support Networking connectivity Network servers Application support Advantages of using the Linux operatin...