National Repository of Grey Literature 38 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Geolocation of Internet hosts
Ingr, Michal ; Müller, Jakub (referee) ; Balej, Jiří (advisor)
This master thesis deals with methods of stations’ geolocation on the Internet, it means the estimation geographic location of unknown station, which is conected to this network. The introductory part describes the methods for determining position, which don‘t need any measeruments of the network. The next section is devoted to points, where delay is invoked, to the causes of latency in the Internet, to their types and some usual values. The following part features ways to measure delays and route, including several tools for this purpose. The penulminate section describes some chosen geolocation techniques based on RTT measurement. The final chapter is devoted to practical demonstration geolocation using the CBG method, when the delay measurement was carried out in an experimental PlanetLab network.
Administration of digital library
Havelka, Michal ; Balej, Jiří (referee) ; Číka, Petr (advisor)
The diploma thesis is focused on problematic of management of digital libraries, more precisely it’s focused on standard MPEG-7 ISO/IEC 15938. The thesis defines description of multimedia content, its basic rules and more deeply it describes work with static visual data. The practical part of the thesis is focused on creating standalone application in programming language Java. Its purpose is using XML files to manage, save, search and for general work with visual data and its parameters. An application is focused on Scalable Color and Dominant Color descriptors and propose alternative calculation procedure by variable parameters.
Location estimation of Internet nodes
Němeček, Ladislav ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This paper deals with methods of stations’ IP geolocation. It’s describes the methods of passive and active geolocation and it’s more focused on active searching methods, which usees measuring the latency in network. The factors causing delays in data transfer are discussed first, followed by discussion of the issue of measuring these delays. After that a brief description of PlanetLab experimental network, which nodes were used for delay measurment. Main topic is practical implementation of method Constraint-based Geolocation in Java programming language. Last but not least the measurement results of CBG algorithm are tested.
Managing Planetlab nodes
Chupáč, Michal ; Balej, Jiří (referee) ; Müller, Jakub (advisor)
Bachelor’s thesis is focused on maintaining and managing PlanetLab nodes from one place. Introductory chapter contains process of network access creation and other important information and guidance. Following part involves remote access thru command prompt by program CoDeploy. This program is used for parallel command execution and file upload to multiple nodes. The thesis contains installation and configuration manual for applications CoDeploy, Plush and Nebula, description of their functions and practical usage in PlanetLab network environment. Section about graphic user interface Nebula deals with module for XML application development. Part with PlMan software alternative for Windows is also completely made out. Ending of the thesis is focused on CoMon monitoring system, its functions, elements and practical application in network.
Geographic location of PlanetLab servers
Iľko, Pavol ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This thesis deals with accuracy of location of nodes in experimental network PlanetLab. Thesis is devided into a theoretical and a practical part. Theoretical part consists of the description of network PlanetLab, its brief history and current projects. At the same time, Google Maps framework, which is later employed in the practical part, is described. Practical part describes the functionality of the application aimed at validation of location accuracy. Nextly, the application measuring latency of node to SSH is also described, as well as the map which contains PlanetLab nodes located in Europe. Applications and obtained data are attached on CD disk.
Geolocation in Internet using latency measurements
Harth, Petr ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This diploma thesis is concerned with practical realization of CBG (Constraint-based Geolocation) algorithm, which is one of the IP (Internet Protocol) geolocation technique. IP geolocation determines the localization of a computer workstation location on the basis of on its IP address. The factors causing delays in data transfer are discussed first, followed by discussion of the issue of measuring these delays. The detailed explanation of IP geolocation follows where its contexts as well as the active geolocation techniques (techniques based on delay measurement mentioned above) are described. After that a brief description of PlanetLab experimental network, which was used for geolocation techniques measuring, is presented followed by a section explaining the creation of reference points and targets, which are another necessary prerequisite for practical realization of the method. Then the practical realization is explained in the form of CBGfinder program and its verification on the basis of artificial input data along with an actual example of IP geolocation of a point in the Internet are provided. Last but not least the measurement results of CBG algorithm are introduced, based on the analysis of Bestline parameters of one of the PlanetLab nodes measured in the period of one month, followed by a discussion of the inaccuracy of geological position and the computation speed. The cumulative distribution function as well as the kernel density estimation are also described. Final part of the thesis consists of discussion on measured results compared to results of other geological techniques results implemented by colleagues of the author of this diploma thesis. The results are compared on the basis of average inaccuracy of geological position estimations and its median, computation time, cumulative distribution function and kernel density estimation are also taken into regard.
Size of delay of active network devices
Bednár, Jakub ; Komosný, Dan (referee) ; Balej, Jiří (advisor)
The aim of this thesis was to study the properties of the active network elements (routers, switches) and to find out what factors affect the size of their latency. Furthermore, the objective was to choose the most appropriate method for measuring latency of the available active network devices depending on the device load, packet size and the configuration of devices. For measuring latency I used the simple script in the operating system Linux and program called PING.
Configuration of Open Shortest Path First routing protocol
Wolf, Jakub ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
A diploma thesis introduces possibilities of the routing protocol OSPF, basic configurations and implementation into an autonomous system. A Theoretical part shows computer networks fundamentals and divide them into several groups according to standarts. It also include a part about addressing scheme in the Internet network and the ways how to subneted networks. A practical part consists of two project, that are create in a simulation program. The first simulates classroom, all the network devices and the computers are included. The second is an exam made for student to introduce OSPF in the autonomous system. The Exam uses new type of an extension, that allow student cooperate together by solving the exam. A summary contains all technique disposed in both simulations and a web presentation.
Geolocation of Internet nodes based on communication latency
Horák, Michael ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This thesis covers the topic of determination of geographical location of a host in internet network while utilizing measurement of the end to end delay and implementation of Constraint-Based Geolocation. Gradually I go through issue of the delay in computer networks and ways how to measure it. Next chapter describes a few ways to geolocate host in internet network with emphasis on the CBG method. Another chapter is dedicated to describing a way to project spherical coordinates to the two dimensional space, which has been used in implementation of geolocation method. Chapter about implementation builds upon the facts given in previous chapters while functions of the program written in the JAVA programing language are being explained. Two similar geolocation methods were implemented. By comparing the results gained by implementation, new method of geolocation is proposed and devised. It combines properities of both previous methods. There are results of the implemented methods and their comparation to the one of the source documents used in creation of this thesis in summary section.
Intrusion prevention system for network security
Popovec, Juraj ; Verner, Lukáš (referee) ; Balej, Jiří (advisor)
This thesis describes mostly used technologies and methods used for securing computer networks. In detail discusses detection and intrusion prevention system (IPS) issues. Includes laboratory excercise for configuring packet firewall and the second excercise, which simulates securing organization network by firewall with intrusion and prevention system technology.

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