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Generating non-standard packets and data flows on Ethernet networks for teaching purposes
Mošnerová, Tereza ; Dvořák, Jan (referee) ; Jeřábek, Jan (advisor)
This diploma thesis is aimed at the process of generating non-standard data streams that contain hidden information. For this purpose a software called Ostinato is used. Ostinato allows to select protocols on the individual layers of the TCP/IP network model according to the needs and preferences, and moreover, data bytes can be inserted and modified arbitrarily using the HexDump fields. Various fields of the TCP/IP protocols are used to hide data on the network, transport and application layers. The generated data packets can be easily modified which enables to create several other versions of them. These can serve, for example, as a semestral project assignment for the subjects Communication Technology and Modern Communication Techniques taught at BUT. In addition, the size limits of the inserted data of the individual data packet options are tested. The functionality of the generated packets is verified by Wireshark. As a result, several .ostm and .pcapng files including a text file with their clear description are provided.
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Web application for automated network design
Grenčík, Dominik ; Dvořák, Jan (referee) ; Kubánková, Anna (advisor)
This master thesis focuses on creating a web application for the automated design of computer networks in the context of the rapid development of information technologies and their crucial role in the business environment. The work consists of theoretical and practical parts, with the theoretical part addressing the development of web applications, necessary programming languages, and tools, as well as the theory of computer networks and their design. The practical section includes the design and implementation of the backend with a relational database and the frontend with a description of components and functionality. The developed web application demonstrates how automated network design contributes to efficient planning and implementation of computer networks.
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Vliv CTF na utužení půdy a ekonomiku zemědělského podniku
DVOŘÁK, Jan
The bachelor's thesis deals with the comparison of three methods of cultivation of Julia winter wheat. The work is focused on the cultivation method in the CTF system. The thesis explains what farming in the CTF system means and what benefits they bring to farmers. GPS systems that belong to automation in agriculture are also described. Attention is paid mainly to the cost of fuel consumption of used rigs and to excess crossings in the field.
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Implementation of mechanisms providing Segment Routing for IPv6 (SRv6) using the FD.io VPP platform
Mjasojedov, Igor ; Dvořák, Jan (referee) ; Koláčková, Aneta (advisor)
The development of the mobile networks of fifth-generation (5G) accomplishes the requirements of transported services. New applications and services put high pressure on bandwidth, reliability and flexibility of the data transport. Due to this trend, network technologies need to be developed to address it and ensure transmission quality. This master's thesis aims at the Segment Routing (SR) concept and its commitment to improving transport quality in the transport part of 5G mobile networks. SR allows the integration of network programming into the traditional design of transport networks. SR uses either MPLS (SR-MPLS) or IPv6 (SRv6) on the forwarding plane. This thesis aims at SRv6. The main goal of the thesis is to design and implement a communication scenario for the transport part of the network with the SRv6 protocol. Docker platform is used to create a topology with all its nodes. The VPP platform is used to enable SRv6 on top of this topology. VPP has the ability to be configured via NETCONF protocol thanks to the Honeycomb agent, which can process NETCONF messages and propagate them to the VPP configuration. This configuration is done by the program Ansible, which can send NETCONF configurations to all SR nodes with Honeycomb installed. Testing and verification of the topology with all SRv6 policies is handled by the TRex traffic generator.
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Rejvíz Bridge in Jeseník
Dvořák, Jan ; Smítal, Petr (referee) ; Holcner, Petr (advisor)
The subject of my diploma thesis is to design the intersection of roads I/44 and II/453 in urban area of Jeseník. Part of the proposal is to address traffic and pedestrian connection to the adjacent tertiary roads.
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Design and analysis of electronically reconfigurable filtering structures
Kříčka, Tomáš ; Dvořák, Jan (referee) ; Langhammer, Lukáš (advisor)
This bachelor thesis deals with the proposal of analog filters with the ability of the electronic reconfiguration. The main aim was to propose three fully electronically reconfigurable filters using different methods. The work focuses on the use of modern active elements that ensure the electronic reconfiguration. Specifically on operational transconductivity amplifiers, second-generation current conveyors and current amplifiers. The transfer functions are simulated in the Orcad PSpice software, at the ideal and behavioral level. Sensitivity and parasitic analysis is applied to the two proposed filtration structures. Both structures are made on printed circuit boards, which are measured and then their transfer functions are compared with the simulated functions.
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Computer networks based on VyOS and Cisco IOS operating systems
Jalovecký, Denis ; Dvořák, Jan (referee) ; Koláčková, Aneta (advisor)
This bachelor thesis focuses on configurations and issues of network protocols in operating systems of Cisco IOS and VyOS routers. One of the main goals include choosing the most appropriate emulator and installation of this emulator in virtual enviroment. The thesis also describes the properties and differences of protocols and their application in the network operating systems mentioned above. After learning about possibilities of emulations, two scenarios, in which the protocols were applied and analyzed, were created. These scenarios meet standard of a lab excersise which takes around one and a half hour. The most frequent issues and their solutions are mentioned as well. }
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Fully-differential frequency filters with nontraditional active elements
Dvořák, Jan ; Koton, Jaroslav (referee) ; Jeřábek, Jan (advisor)
Bachelor's thesis deals with designs of fully-differential frequency filters which operate in current mode where it is possible to control their parameters by change the transconductance or the amplification. The first part divides and describes in general frequency filters. Furthermore, there are described active elements together with their simple simulation models. The second part describes the design of frequency filter by M-C signal-flow graph and methods of transforming final circuit to fully-differential structure. Next part presents several structures of the second-order filter with their simulations in non-differential and fully-differential forms. Last part presents designs of boards of printed circuits and measurement results of two chosen circuits.
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Vibration at milling of metal
Dvořák, Jan ; Štetina, Jakub (referee) ; Fiala, Zdeněk (advisor)
This thesis contains theoretical description of milling, mathematical description of oscillation and causes of self-excited vibrations during the milling process. It further contains dynamic measurement of machine-tools and stability lobe diagram. At last it states different ways of prevention, removal or maximum reduction of self-excited vibrations during the milling process.
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