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Laboratory exercises explaining network technologies using various simulation instruments
Vaľuš, Dávid ; Ilgner, Petr (referee) ; Bečková, Zuzana (advisor)
This diploma thesis focuses on the preparation of an operating system, a simulation environment and the creation of two laboratory exercises explaining network technologies. In the theoretical part protocols DHCP, FTP, TFTP, HTTP, and NAT service are described. The practical part focuses on the installation of ns-3 and GNS3 programmes and their utilization and settings on OS Ubuntu 18.10. Moreover, it deals with the preparation of laboratory exercises created in the simulation programmes mentioned above together with tutorials, self-check questions and HTTP server in the Python programming language.
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Link layer LAN network security
Sedláček, Jiří ; Grenar, David (referee) ; Slavíček, Karel (advisor)
The bachelor‘s thesis is about security concerning local area networks of the data link layer. The goal of the thesis is to characterize basic functioning of the ISO/OSI reference model as well as describing how the data link layer works to understand the topic, specify the possibilities of attacking the data link layer (for example rogue DHCP server, ARP spoofing, CAM table overflow, attacking the spanning tree protocol and others) and possible security measures to protect against the attacks. The purpose of the thesis is also a suggestion for assembling an experimental network relating to the topic of the thesis. Theoretical part determines the most important protocols of the data link layer, methods of abusing them and protection of those protocols. The practical part contains a brief description of the attacks, used utilities for accomplishing the attacks, a network topology, execution of the attacks, detection and protection against the attacks as well as briefly summarizing the results. The thesis also sums up some of the possible recommended configuration to repel the attacks and suggesting how to behave in a cyber environment. For the purpose of simulating the attacks, Kali Linux and Windows 10 are the operating systems that were used the most in this thesis.
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LAN communication unit resistivity against Internet origination attacks
Valach, Michal ; Mlýnek, Petr (referee) ; Mišurec, Jiří (advisor)
This thesis is focused on crypto-module RCM 3700, which is used for encrypted data transmission. Following work analyses basic network protocols and some sort of attacks in Ethernet network. The main goal of these attacks is to collect information and services about the device and to analyze transmitted data. Based on these information attacks can be done more precisely than without them. The main target of these attacks is the denial of particulary service or data abuse. Furthermore, in the diploma thesis configuration of router CISCO 2801 is applied in order to improve the LAN security. The deveploment board, which includes reset function, supplied circuit and interface for RS 232, was designed for crypto-module RCM 3700.
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System for Remote Monitoring of Electrical Values
Kvasnička, Pavel ; Kněžík, Jan (referee) ; Drahanský, Martin (advisor)
The work deals with the measurement of electrical quantities, distribution of data across the Ethernet network into the Internet and intelligent selection of the required values to be transmitted and stored on a central node. The work describes the communication protocols in scale that is necessary for implementation, discussed the requirements for computational resources and microcontroller control is proposed by flowcharts. Attached are source codes in C programming language for microcontroller and PHP scripts for storing and presenting data on Web server.
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lmprovement Proposal of Network Services Model for Techniserv IT s.r.o. company
Lavický, Jindřich ; Hanzlík, Jiří (referee) ; Ondrák, Viktor (advisor)
The bachelor thesis describes a proposal of network services model for Techniserv IT s.r.o. company. It analyses the present state of IT infrastructure in organization and suggests appropriate and economical solutions. It describes constituent areas of network services and their advantages. In detail, it focuses on the area of network services implementation, which is crucial for this type of work. At the end, it proposes solutions and evaluates their assets for a company.
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Devices Monitoring in Computer Networks
Kutaj, Matej ; Musil, Petr (referee) ; Škorpil, Vladislav (advisor)
This bachelor thesis deals with the supervision of computer networks and related technologies. The bachelor thesis describes individual technologies, topology of supervised network, list of Vlan networks, description of Zabbix system, its implementation in Hyper-V and setting of individual network adapters, description of error solving by creating script and then creating all elements using web interface. The results are created by maps of individual monitored networks and created graphs from priority switches.
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Modeling the Basic Principles of Communication Technologies
Ruiner, Michal ; Koláčková, Aneta (referee) ; Hošek, Jiří (advisor)
This bachelor thesis deals with the design of 5 laboratory tutorials where the basic principles of communication technologies are modelled. A reader is apprised with the available software first for the simulation of network technologies. The simulators and emulators are compared. Packet Tracer, a software developed by the Cisco company, is chosen for the lab exercises and Wireshark, a network protocol analyzer, for the traffic capturing on a local PC. Then the reference model ISO/OSI is described for the basic introduction to the principle of network communication. The Chapter 3 explains the basic problematics of network paths searching, the routing table contents and division according to the type of routing and routing protocols groups. In the next chapter, particular communication protocols used in the labs are analyzed in detail. Final part briefly describes the implementation of all laboratory exercises. Laboratory tutorials are provided in the appendices.
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Link layer LAN network security
Sedláček, Jiří ; Grenar, David (referee) ; Slavíček, Karel (advisor)
The bachelor‘s thesis is about security concerning local area networks of the data link layer. The goal of the thesis is to characterize basic functioning of the ISO/OSI reference model as well as describing how the data link layer works to understand the topic, specify the possibilities of attacking the data link layer (for example rogue DHCP server, ARP spoofing, CAM table overflow, attacking the spanning tree protocol and others) and possible security measures to protect against the attacks. The purpose of the thesis is also a suggestion for assembling an experimental network relating to the topic of the thesis. Theoretical part determines the most important protocols of the data link layer, methods of abusing them and protection of those protocols. The practical part contains a brief description of the attacks, used utilities for accomplishing the attacks, a network topology, execution of the attacks, detection and protection against the attacks as well as briefly summarizing the results. The thesis also sums up some of the possible recommended configuration to repel the attacks and suggesting how to behave in a cyber environment. For the purpose of simulating the attacks, Kali Linux and Windows 10 are the operating systems that were used the most in this thesis.
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DHCP Monitoring Using IPFIX
Vaňátko, Matěj ; Polčák, Libor (referee) ; Matoušek, Petr (advisor)
This thesis describes procedures for traffic monitoring of network protocols BOOTP, DHCP for IPv4 and DHCP for IPv6 through netflow probes FlowMoon made by Invea-tech. There are outlined the issues of these protocols, the functionality of the FlowMoon probe, a general description of NetFlow and the description of the solution for collecting and evaluation of the data. A deep analysis was made, and later on the modules for FlowMoon probe was written giving the possibility to monitoring of these protocols. Their implementation, method of testing and evaluation of gathered data is described in this paper.
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Devices Monitoring in Computer Networks
Kutaj, Matej ; Musil, Petr (referee) ; Škorpil, Vladislav (advisor)
This bachelor thesis deals with the supervision of computer networks and related technologies. The bachelor thesis describes individual technologies, topology of supervised network, list of Vlan networks, description of Zabbix system, its implementation in Hyper-V and setting of individual network adapters, description of error solving by creating script and then creating all elements using web interface. The results are created by maps of individual monitored networks and created graphs from priority switches.
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