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Switches security risks
Halaška, Peter ; Novotný, Bohumil (referee) ; Sobek, Jiří (advisor)
The aim of this thesis was to study and subsequently process issues of securing switches operating at the data link layer of OSI/ISO model. Map individual switch attacks with their review. On the basis of this information realize chosen attacks with presented results.
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Analysis of Cryptographic Algorithms 802.11
Vojtíšek, Jindřich ; Sobek, Jiří (referee) ; Novotný, Bohumil (advisor)
This work deals with wireless standard 802.11, primaly about security algorithms used in them. Further there is made analysis of algorithms WEP, WPA and WPA2. This algorithms are described how coding by them works and for easier understandig are added block schemes of their principles. In practical part is realized algorithms WEP, WPA and WPA2 in program Matlab simulink. Model is complemented by graphs which shows how data changes when comming throught this systems.
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Advanced system for computer data back-up
Sobek, Jiří ; Šporik, Jan (referee) ; Vychodil, Petr (advisor)
This master thesis is mainly focused on the backup systems and describes each individual backup techniques in detail. Next main point of this thesis, is explaining functionality of IPv4 and FTP, which are closely related to the topic. Outcome is a backup application written in Java language, which is capable of backup files on FTP server or on local/ network storage area. Backup application also allows settings for automatic backup and restoring files from the storage area. Finally there was made a measurment, where were point out advantages and disadvantages of transfer mediums and where was practically shown a logic of creating the backup system. Goal was a creation of multiplatform backup application.
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Switch optimization in converged network
Švec, Adam ; Sobek, Jiří (referee) ; Škorpil, Vladislav (advisor)
Switch Optimization in a Converged Network thesis discusses the role of the Ethernet switch in the network. It describes differences between the switch and the hub in the network and the impacts on the collision domain size. In the converged network, priority data switching according to their origin and thus the qualitative point of view is also addressed - e-mails, voice services and multimedia will each behave differently. A real element, switch L3 - a switch with services quality support - is mentioned. The tool Matlab - Simulink is briefly described and a functional simplified model of the ethernet switch was created. Furthermore, the topic was used as a theme for a laboratory task in the subject Services of Telecommunication Networks. A model for Simulink and an example of the laboratory protocol for the created task are attached to the thesis.
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Prediction of data flow in computer networks
Zvěřina, Lukáš ; Sobek, Jiří (referee) ; Vychodil, Petr (advisor)
The aim of this thesis was to study problems of prediction of data in computer networks. Furthermore, this work deals with network traffic and analyzing its properties. In this study were analyzed the possibilities of network traffic prediction using Farima model, the theory of chaos with Lyapunov exponents and neural networks. Possibilities of prediction with the focus on neural network were discussed in detail here, mainly on recurrent neural networks. Prediction was performed in Matlab development environment in Neural Network Toolbox, where they were created, trained and evaluated neural network to predict specific types of network traffic. For testing were selected Elman network NARX network and general LRN recurrent network. The results were clearly organized into tables and plotted in graphical relationships before and after the use of predictive techniques designed to final evaluation.
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Software design for mapping of the network topology
Janura, Dominik ; Novotný, Bohumil (referee) ; Sobek, Jiří (advisor)
This thesis addresses the issues of network topology mapping, where the network consists of multiple Cisco devices. It includes theoretical knowledge in this field and closely describes possible solutions to this problem. It explains the process of design and implementation of this kind of network mapping software by chosen means. Correct function of the created application is tested on a virtual network.
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Router principles illustrating software for teaching support
Sobek, Jiří ; Vymazal, Michal (referee) ; Vychodil, Petr (advisor)
This bachelor thesis is mainly focused on the network functionality and its key component, the router. The main points of this work are an explanation of the network principles and router functions which are extended with information about routing protocols and its mutual separation. The practical part considers a realization of applets which should serve as a school software. In detail they explain the way of routing protocols work and its inner structure. Simultaneously consider the principles of two significant routing protocols such as Open Shortest Path First (OSPF) and Routing Information Protocol (RIP). All of the applets are finally loaded on the web page which helps to their visitors understand the complexity of routing and other infomation.
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Sacred space - In the era of gothic thinking, art and architecture
Sobek, Jiří ; Veverková, Kamila (advisor) ; Royt, Jan (referee)
The thesis entitled Sacred space in the era of Gothic thinking, art and architecture deals with a certain specification of the sacred space, the function and meaning of the medieval church, events leading to the beginnings of Gothic art which left its imprint on the general medieval art and whose influence radiates from the 12th century and ends in the 15th century An essential part of the text is dedicated to using the given rules in the sacred space of the castle Karlstein.
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