This bachelor thesis analyzes threats of the operating system GNU/Linux and its abilities of their elimination in relation to the network in an academic environment. The work is divided into four basic logical parts, where we in sequence get acquainted with the issue of security at an operating system level, from problems of network security to physical security. In the final part an example of network is described and graphically demonstrated, which could appear in an academic environment. The issue is watched from an administratorīs side so that the analysis of security risks is described theoretically up to the point and exact exploiting methods are hidden. The software that is used is mostly Open Source-based, which has pros and cons, that are mentioned in the opening chapter. This work is an administrator guide which helps to find a solution of security not only of an academic network step by step. The author strives for taking the same regard for an issue of security which is taken for funcionality in the course of creating information solution. For right understanding of the issue solved in this work it is necessary to have good knowledge of administration of a system from the Unix family - preferably GNU/Linux.
This bachelor thesis is not provided under some kind of public licence, because of releasing this work as the search thesis at FNSPE CTU (www.fjfi.cvut.cz) at the end of summer semester 2005! Search thesis is completely identical with bachelor thesis - only includes some formal conversions. Search thesis is released under GNU FDL. Please, apologize this formal policy.