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Methods for measurement of data network performance and quality parameters
Sukup, Luboš ; Zeman, Václav (referee) ; Novotný, Vít (advisor)
Master thesis involves the development of quality measurement issues and performance parameters in data networks. It describes the main technologies as they affect the quality and performance parameters and the effect of these parameters for voice, video and data services. Next are listed some methods for measuring parameters of the data network.In the practical part is selected one method of measuring network parameters and properties of this method are demonstrated by illustrative examples.
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Attacks on active network elements
Ščepko, Richard ; Kacálek, Jan (referee) ; Polívka, Michal (advisor)
The bachelor thesis deals with the topic of the security of computer networks. The tasks of the bachelor thesis are the attacks on active network elements with the aim of the catching of data between two users. In the created structure with a stellate topology, the user stations have connect to the active element (switch). In the thesis, the individual ways of attacks and the significance of ARP proceedings to MAC addresses have describ. Several programmes have use in order to take control over the device. Due to a big amount of these active elements the source code of the programmes had to be alter. The work with the programmes ARPtool and ARPoison demanded the operational system Linux, in our case the distribution of Ubunt. The programme WinArpAttacker could be set off under the system Windows XP as well. The achieved results and the description of the practical part are discuss in detail in the summary of the thesis. The result is the catching communication with the help of the programme WireShark.
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BigData Approach to Management of Large Netflow Datasets
Melkes, Miloslav ; Ráb, Jaroslav (referee) ; Ryšavý, Ondřej (advisor)
This master‘s thesis focuses on distributed processing of big data from network communication. It begins with exploring network communication based on TCP/IP model with focus on data units on each layer, which is necessary to process during analyzation. In terms of the actual processing of big data is described programming model MapReduce, architecture of Apache Hadoop technology and it‘s usage for processing network flows on computer cluster. Second part of this thesis deals with design and following implementation of the application for processing network flows from network communication. In this part are discussed main and problematic parts from the actual implementation. After that this thesis ends with a comparison with available applications for network analysis and evaluation set of tests which confirmed linear growth of acceleration.
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Packet Analyser for UWB based on 15.4a standard
Leixner, Martin ; Šimek, Milan (referee) ; Mráz, Ľubomír (advisor)
The aim of this work is study the standard for wireless sensor networks IEEE 802.15.4a. Design and implementation of a packet analyzer for ultra wideband technology com- pliant with IEEE 802.15.4a standard. Integrate packet analyzer to inspection software Wireshark and implement dissector for view packets. Finally, analyze and evaluate the parameters of the proposed packet analyzer.
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Adaptation of access networks for advanced networking technologies
Frollo, Martin ; Škorpil, Vladislav (referee) ; Novotný, Bohumil (advisor)
The bachelor thesis is focusing on the real-time services running in packet networks and problems that may arise while they are running. Specifically it is focused on the technology of VoIP service. There are many different signaling protocols to support this service. Among others, the SIP protocol is very widespread. In addition of the connection it is necessary to ensure the transmission of voice data. That is the task of the RTP protocol. This service and also others for which time is critical with increasing constraints on networks it needs to be frequently given the priority over traditional services like downloading files, and more. VoIP service has certain requirements for transmission parameters that must be followed for optimal function. They are for example, packet loss, one-way delay and delay variation. Most problematic is to ensure the optimal operation of the service on slower transmission routes. That is why it was necessary to establish mechanisms capable of real-time services to ensure sufficient network capacity to meet end user. These are, for example technologies of integrated services or differentiated services. At the present time, however, the technology of integrated services is not very widespread because of its inefficiency. On assembled telephone network made from available components in the laboratory, there are analyzed and confirmed some of the distinctive features and characteristics of the SIP protocol. Furthermore, measurements confirmed sufficient network capacity for VoIP service of the used network and parameters affecting security of the QoS have been evaluated.
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CIP industrial protocol simulation
Molent, Michal ; Musil, Petr (referee) ; Blažek, Petr (advisor)
The thesis is about industrial automatic CIP protocol, which belongs to SCADA systems. The first part is focused on basic principles of CIP protocol and on analysis of two protocols (EtherNET/IP and DeviceNet), which are based on CIP protocol. The second part deals with designing scenarios for a simulation. The simulation of one-way communication, two-way communication with help of reads from the console and two-way real time communication between Raspberries PI 3B+. The third part deals with a realization of the simulation, a start-up and a function of predefined scenarios and graphic interface. The fourth part deals with analysis network communication in situations, which occur during a protocol EtherNet/IP simulation.
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CAN sniffer
Skalický, Jakub ; Jílek, Tomáš (referee) ; Burian, František (advisor)
This bachelor thesis deals with creating CAN Bus sniffer witch sending data to PC by Ethernet. The main parts of developed PCB are microcontroller SMT32F407VGT6 by STMicroelectronics and Ethernet PHY KSZ8051MLL. In theoretical part you can find ARM and STM32F407VGTE information followed by Ethernet and UDP protocol introduction. The end of theoretical part is about CAN bus. Practical part is about design of board, developing it and measuring parameters of board. The end part of this thesis describes changes of software. Firstly there are described changes of firmware for add support of CanShark board. Followed is described adding of new functionality of canshark-gui PC application.
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Accounting and Inspecting IP Telephony Traffic
Sivák, Vladimír ; Ryšavý, Ondřej (referee) ; Matoušek, Petr (advisor)
This thesis describes architecture of IP telephony networks based on signaling protocol SIP and transport protocol RTP. Also tools used for analyzing VoIP traffic are described. Main objective is to design and implement a system for the detection of calls and extraction of voice payloads from the captured packets. The system first recognizes the signaling messages of SIP protocol. These messages are analyzed afterwards. Output statistics are generated based on gathered data. Voice data will be stored in form, which is suitable for further processing.
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Private networks in the field of telephony
Mašát, Libor ; Polívka, Michal (referee) ; Škorpil, Vladislav (advisor)
This bachelor thesis deals with the issue of private networks in the field of telephony. It deals with the used cabling and wireless communication, discusses possible faults and deals with various connection parameters. The output of the work are two laboratory tasks focused on VoIP telephony. The first laboratory task analyzes the communication of used SW phones (Zoiper, X-Lite) in the Wireshark program. In the second laboratory task, the SW private network in a virtual environment is compiled. Two FreePBX control panel SWs are installed and configured in this virtual environment. Using three VoIP phones (Zoiper, X-Lite and MicroSIP), an audio call is made during normal operation and under load. Graphs and communication data are displayed using Wireshark.
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Laboratory scenarios describing DNS system
Sakala, Peter ; Langhammer, Lukáš (referee) ; Jeřábek, Jan (advisor)
The master’s thesis deals with Domain Name System (DNS) and its practical use. It describes hierarchy of domain names, resource record types, protocol used, as well as DNSSEC extension. The most utilized implementations of authoritative and recursive DNS servers are presented. Virtualization, containers and other tools with potential use in labs are described. Two lab scenarios in virtualized environment with instructions for students were designed and developed in this thesis.
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