Linux is the only server-class operating system to increase its market share. Not even Windows NT did that. With its new found popularity, security is now becoming an ever-increasing concern. Once the playground of computer hackers who generally knew the principles of securing their systems, Linux is now used by the computer novices as well. When they want to secure their system, novice users don't know where to begin. With the recent rise of new attack tools that can use multiple systems to flood commercial sites, unsecured systems become a serious threat to the well-being of the systems.