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GWT and other modern web frameworks
Hill, Tomáš ; Lambertová, Petra (referee) ; Pelka, Tomáš (advisor)
This bachelor thesis deals with the comparison of modern web frameworks. The main aim is to describe JavaScript framework Google Web Toolkit and also compare it with other JavaScripts frameworks such as DoJo or MooTools. The web frameworks are designed to facilitate the development of web applications. In the next part of this thesis is carried out a web application with Google Web Toolkit framework, which is intended to manage various school projects.
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Network load generators
Kubík, Pavel ; Koutný, Martin (referee) ; Pelka, Tomáš (advisor)
The aim is to create, test and describe the network load generator for server-client connection type. It´s used language C++ under Linux. It was also used socket and multithreading programming. Load on the server is done by sending HTTP requests. The load generator have different adjustable parameters and displays the test statistics. In this work is described mechanisms wich are used, by the application, to load. Testing was done on one server with a different size of the target file.
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Adaptive Linux firewalls, geographic firewalls
Najbr, Ondřej ; Kacálek, Jan (referee) ; Pelka, Tomáš (advisor)
The aim of the Bachelor's thesis is to study and describe the options of adaptive firewalling, which has a Linux firewall netfilter, and to study the advanced routing and marginally geographic IP filtering. In detail I will deal with the work with Iptables and its using in creation of firewalls for the Linux operating system. In the next section in detail I will describe the design and implementation Linux applications of creating rules in Iptables.
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Software for seeking vulnerable computers in network
Krkoš, Radko ; Pelka, Tomáš (referee) ; Polívka, Michal (advisor)
This thesis concerns about computer system and network infrastructure security. It describes the topic of security holes and vulnerabilities and discusses possibilities for computer attack defense. Common security holes and client and server systems configuration errors are described. There are stated simple rules and advices for configuring network environment according to security and minimalization of failure or violation risk due to security holes and vulnerabilities. Thesis adresses approaches of security hole detection in programs and devices entrusted to administrator, device and security holes inventory control and prevention possibilities. Thesis describes how to execute self security audit and how to process its results. It suggests techniques and methods to administer network, server, or intranet during its lifespan according to security. It also analyses existing available software and evaluates its features and resources with regard to security topic. Software is chosen to simplify work for administrator in some or more parts of security management like network condition analysis, error and vulnerability detection in computer systems, network infrastructure, web applications or applications for network alternation detection. Thesis recommends requirements for security audit application and discusses eligible features in regard of functionality and added value. Created set of scripts simplifies administrator's work by automating common and time consuming tasks and delivers information in compact and simple form, what makes the work more comfortable and shortens the reaction time to crises such as discovery of new security hole or security breach.
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Server system monitoring
Jankulár, Marián ; Pelka, Tomáš (referee) ; Zeman, Václav (advisor)
Object of this bachelor thesis is to study concept of administration and monitoring server systems. Mapping out and describing basic components of monitoring tools, its options of adjustment from monitoring point of view and also from server adjustment point of view. Mapping out supported operating systems and possibility of component, aplications and sources that can be monitored. As a result of this study, there will be created monitoring structure for monitoring servers. After successful creation of the monitoring structure, there will be measurment and report of the measurment provided.
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Virtualization for the x86 platform
Müller, Pavel ; Kyselý, František (referee) ; Pelka, Tomáš (advisor)
A thesis describes a virtualization of x86 platform. In the first part the virtualization, its utilization and specific types of virtualization are described in a general way. The specific types of virtualization are full virtualization, paravirtualization, virtualization on core level, hardware virtualization and application virtualization. There is also described a general function of virtual machine, reasons of virtualization implementing, current development, focusing on future development and virtualization security. In the second part the thesis tries to find a solution with establishment charges of virtualization. To test purposes the following software programs were used. The first one is freeware benchmark Sandra from SiSoft company and second one is a software created on the basis of the thesis. For the tests the CPU overhead both an arithmetic-logical unit and a unit for work with numbers and floating decimal point, a RAM data transmission efficiency and a hard disk logging rate were chosen. The following test machines were described: VMWare, VirtualBox and Xen. In the third and the last part of the thesis is a description of network interface virtualization methods with a utilization of tun and tap system. In each particular step a virtual network interface creation and implementation are presented. Model situations of communication among virtual and physical machines with usage of these devices are described at the end of the thesis.
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Security protocols in practice
Milfajt, Jiří ; Koutný, Martin (referee) ; Pelka, Tomáš (advisor)
This bachelor's thesis maps the most used AAA protocols in these days. These protocols include RADIUS, TACACS+, DIAMETER and KERBEROS. The first part considers its main signs. Then there is describes basic communication between user and server. The thesis also compares each protocol by its advantages, disadvantages and its possible security weaknesses. The second part is dedicated to configuration of RADIUS and KERBEROS protocol.
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Network server performance when communicating with a great number of clients
Mašín, Jan ; Pelka, Tomáš (referee) ; Komosný, Dan (advisor)
The aim is to create a simulation system between two computers of the server-client type to generace the process to server while usany UDP protocol: to set different parameters of the generated process (size of paquet, interval of sending) and evaluace the server-sources consumption (memory), to work out the outcomes in a well-organized manner. There have been tested two servers (each of different output) and operational systéme Windows XP, Windows Server 2003, Linux Mandriva 8.0 and Linux Fedora 7, each of these had been installed on the servers with different outputs. The generated process is carried out with usaje of the paquet generator made in the programming language C++.Two different programmes needed have been created, one of them for klient(paquet generation in OS Windows), its aim is to generate the paquets, the sekond on efor server (functional version working in OS Linux had had to be made) receiving the generated paquets. Evaulation of the source-consumption was carried out by two monitoring programs, one of them suited for OS Windows, the other for OS Linux. Both programs safe the information about procesor-work and operational memory into a text dokument which is very simple and fast way for searching the information. The measured values show charts and graphs that express the efficiency of separate OSs or, in case of need, servers of different outputs are able to handle the generated paquets and how do the alterations of the paquet generator affect the source efficiency( paquet size and paquet-sending interval).
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Visualization of connections between computers
Kovář, Jan ; Pelka, Tomáš (referee) ; Komosný, Dan (advisor)
Project Multicast IPTV Research Group mainly deals with the proposing of new mathematical models and communication protocols within IPTV technology. This technology is associated with VOD (Video on demand) and internet services such as web pages or VoIP (Voice over Internet Protocol). This bachelor thesis is focused on IPTV theory, history and achitecture. Analyse multicast, its attributes, routing and protocols used to broadcasting. Subtilize posibility of graphics formats for visualization, their advantages and disadvantages. Final objective of this project, which is solved on Multicast IPTV Research Group project, is application, which analyse input data generated by hierarchy summarization. By virtue of graphviz are generated output data in svg format. It is easy to view this svg files in later types of internet browsers.
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Server management application
Smahel, Petr ; Pelka, Tomáš (referee) ; Krajsa, Ondřej (advisor)
This thesis deals with the management of computer servers. The theoretical part describes the client-server architecture, operating system GNU/Linux and server management tools. The second chapter is devoted to design an own application to manage servers. The next chapter describes the design and implementation of individual modules from which application is build. In the fourth chapter there is described how to install and configure the application on the GNU/Linuw operating system. The penultimate chapter is written as a user manual and acquaints reader with application control. In the last section there are results obtained in testing the application presented and commented.
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