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Nasazení volně dostupného simulačního nástroje v laboratorních cvičeních
Nečas, Marek ; Tomašov, Adrián (oponent) ; Horváth, Tomáš (vedoucí práce)
Cílem předložené práce byl návrh úloh do laboratorních cvičení zaměřených na komunikační sítě. Úlohy jsou orientovány na fyzickou vrstvu páteřních optických tras a využívají volně dostupný simulátor GNPy. Teoretický přehled shrnuje vlastnosti základních komponent určujících kvalitu signálu v transparentních optických sítích, tj. optických vláken a zesilovačů. Dále popisuje veličiny OSNR a GSNR jako kvantitativní měřítka degradace signálu a představuje softwarový nástroj GNPy, umožňující jejich výpočet v modelu reálné sítě. Praktická část obsahuje návody pro dvě laboratorní úlohy s teoretickým úvodem, postupem a závěrečnými otázkami ověřujícími pochopení tématu.
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Security system using optical sensing systems
Šišolák, Filip ; Tomašov, Adrián (oponent) ; Dejdar, Petr (vedoucí práce)
The thesis deals with the issue of distributed sensing using optical fibers and its implementation within object security. The theoretical analysis extensively describes the principles of operation and potential applications of the most commonly used optical fiber sensors based on interferometry, diffraction structures, and scattering measurements. The theoretical part also includes an overview of the current state of optical sensor systems in the context of object security. For the practical part, the architecture of the fiber sensor is selected using theoretical knowledge and testing measurements. The description of the hardware and software architecture of the developed security device outlines its functionality. The conclusion of the practical part focuses on testing this device and comparing it with commercial electronic systems in terms of cost.
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XGPON module for Wireshark
Šuba, Patrik ; Horváth, Tomáš (oponent) ; Tomašov, Adrián (vedoucí práce)
The master's thesis deals with the design of a PcapNG file format for supporting XG-PON data and explores the possibilities of creating a module. The aim is to create a module as a technical tool for detailed analysis and diagnostics of XG-PON networks. The file design proposal consists of packet processing by a network analyzer and the creation of PcapNG format blocks. This file design proposal is implemented in a program written in the Python language. The Wireshark module is implemented in the LUA programming language which have native support for utilizing the new link layer. The use of the module involves configuring the application to support the XG-PON protocol and utilizing the module itself, which can process XG-PON frames in both directions of communication in the proposed PcapNG file. An important part was the verification of the module's functionality on data from an available XG-PON network, demonstrating its ability to correctly process data from a real environment. The result of the work is a tool for the analysis and diagnosis of XG-PON networks, which can contribute to better management of these modern optical networks.
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Design of laboratory activities for Telecommunication network services course
Dúbravka, Adrián ; Tomašov, Adrián (oponent) ; Horváth, Tomáš (vedoucí práce)
This master's thesis focuses on designing three laboratory tasks for the subject of Telecommunication Network Services. The aim of this work is to develop education in the field of telecommunication networks through practice-oriented tasks. The work begins with a theoretical introduction that addresses current requirements for metallic and optical networks. It thoroughly examines the various services and approaches used in these networks. The theoretical part specifically focuses on the IXIA network analyzer, which is presented as a key tool for analysis and testing in laboratory conditions, including its advantages and limitations. In the practical part of the work, the design of three laboratory tasks integrated into the course is presented. These tasks are designed to correspond to realistic network scenarios and provide students with practical skills with devices and software. The first task involves working with the IXIA network generator, the second task focuses on simulation and testing using the GNS3 software and the third task thoroughly analyzes the DOCSIS system, its configuration, and functionality.
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Anomaly and threat detection in audit logs using machine learning
Ludes, Adam ; Ježek, Štěpán (oponent) ; Tomašov, Adrián (vedoucí práce)
The thesis explores cloud-native architecture, anomaly detection techniques, machine learning, and data analysis to develop an anomaly detection model for audit logs from the Red Hat OpenShift Container Platform. Statistical methods and time series analysis for anomaly detection are introduced, while machine learning models and preprocessing techniques are implemented and evaluated. The results demonstrate limitations in traditional models for handling anomalies in deeply nested data, while the NLP model shows robust performance. This research provides valuable insights and is a reference for researchers and practitioners in cloud-native architecture, anomaly detection, machine learning, and data analysis.
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Analyzátor optických tras OTDR
Šimková, Barbora ; Tomašov, Adrián (oponent) ; Dejdar, Petr (vedoucí práce)
Cílem této diplomové práce byl teoretický rozbor problematiky OTDR, rozbor komponentů zařízení OTDR a také základních parametrů tohoto zařízení. Součástí diplomové práce je i teoretický rozbor odrazů, rozptylů a jednotlivých typů konektorů. V rámci praktické části byl proveden návrh zapojení pro měření metodou OTDR a jeho následná realizace. Zapojení bylo realizováno s vývojovou deskou Red Pitaya a laserem Koheron. Dále bylo vytvořeno také zapojení pro měření přímou metodou. Ve vývojovém prostředí LabView byl vytvořen program včetně grafického uživatelského rozhraní. Navržena byla také laboratorní úloha, která slouží k základnímu pochopení problematiky měření OTDR.
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Optical network design
Polaček, Adam ; Tomašov, Adrián (oponent) ; Horváth, Tomáš (vedoucí práce)
This bachelor thesis deals with the design of a technological optical network for the area of Hradec Králové, for the company ČEZD Distribuce. The theoretical part of the thesis describes the current network design and discusses network protocols. The practical part of the thesis describes the passive part and the logical part of the network. An important part of the thesis, is the fiber scheme and configuration design for router and switch. In the last part of the thesis, simulation in GNS-3 program is shown.
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Analysis of GPON frames using machine learning
Tomašov, Adrián ; Horváth, Tomáš (oponent) ; Holík, Martin (vedoucí práce)
This thesis focuses on the analysis of selected part of GPON frame using machine learning algorithms implemented by using TensorFlow library. Considering that the GPON protocol is defined as a set of recommendations, implementation by various device vendors may be different to designed protocol. Therefore, an analysis by a push-down automaton is not sufficient. The main goal is to create a system of models using TensorFlow library in Python3 capable of abnormality detection in the communication. These models use various architectures of neural networks (e.g. LSTM, autoencoder) and focus on different types of analysis. This system learns from baseline traffic and notifies about irregularities found in the newly captured traffic. As a result, the system estimates the similarity level of current traffic compared to the baseline.
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Analysis of possible threats in old OS Linux version
Chovancová, Emília ; Dejdar, Petr (oponent) ; Tomašov, Adrián (vedoucí práce)
The bachelor thesis is focused on the security aspect of an older version of a Linux based machine. The document is split into a theoretical part which contains a description of what operating system, kernel, UNIX, GNU/LINUX and Linux OS are in general. Then the description proceeds to explanation of active and passive attacks such as replay, masquarade, denial of service, man in the middle or listening and analysing the network. Afterwards it continues with description of potentially vulnerable spots that are common on operating systems. With the help provided from scanning software, especially Nmap and Lynis, the document proceeds to the practical part which contains various types of successful and unsuccesfful attacks such as password recovery, denial of service, spectre, brute force of a password and cross-site scripting. The last part covers the protection against succesfull attacks and adds a little bit more of additional protection in general in a form of an ansible script.
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Automated Testing of OS Linux Protocol Stack Behaviour During Congestion
Tomašov, Adrián ; Grégr, Matěj (oponent) ; Lichtner, Ondrej (vedoucí práce)
This thesis is focused on observing and simulating network congestion in laboratory conditions, and on automated testing of the protocol stack in the Linux operating system during network congestion. We perform a set of experiments to find the impact of network congestion on the protocol stack. The simulation and emulation method of this network using physical device will be described. The outcome of this thesis are various configurations of devices and emulators for network congestion together with measurements and evaluation of results. These configurations will be used for automated testing of the kernel of the Linux operating system to catch development errors, network protocol stack errors and card driver error earlier.
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