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Modelling of network communication in OPNET IT Guru environment
Mazák, Andrej ; Škorpil, Vladislav (referee) ; Hošek, Jiří (advisor)
The aim of this work is to describe modeling of network communication with the given network performance and load. The selected model of network approaches the real network topology of a telecommunication operator that provides network services for the customers. We take a closer look on the functions of the significant network protocols EIGRP and BGP and we also will focus on their configuration on the selected network devices. Routing in the network will be analyzed in the individual project scenarios with a use of selected routing protocols. Routing policy will be enforced for a BGP protocol in a separate scenario with an aim to prefer a concrete routing path to the destination, which is a common case of traffic engineering. The issue of virtual private networks is also taken into a consideration in an individual scenario, where there is Firewall as a specific network device used for separation of networks of a different trustworthiness and a following introduction of IP tunneling for an encrypted communication among the selected network entities within the topology. Simulation of the network communication is aimed on the response of FTP service, time delay of Ethernet, throughput of backbone links and communication flow in the targeted scenarios. The output of this work deals with the analysis of the achieved results, comparison of graphs as well as evaluation of the determined simulation parameters.
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The PXA270M ARM module and its usage as private branch exchange
Vojtíšek, Jindřich ; Šilhavý, Pavel (referee) ; Daněček, Vít (advisor)
This work deals with using the operating system Linux on diskless devices. This is solved on the development kit Voipac PXA270M, which is based on the ARM processor. This work deals further with the distributions of the Linux operating system, which are suitable to use for the device based on the ARM processor. The Linux was chosen because it is one of the most flexible operating systems and the Linux is kept as open source software code, except to the distribution of the Red hat and a few special distributions. The NFS protocol and TFTP are described there. The TFTP and NFS are used to deploy the operating system. It describes there, what are the TFTP and NFS and the principle of their use in computer networks. Practical part is as to, what is needed for the functioning of the TFTP and NFS server on the Ubuntu 11.10 plus how configure them. The OpenOCD is another part of this work. The OpenOCD is designed to work in the device memory. There is shown how to install and run the OpenOCD in order to communicate with the development kit Voipac PXA270M. This work shows how to configure the bootloader U-boot for booting the operating system from the network using the NFS and TFTP. There is described how compile and install PBX Asterisk on Voipac PXA270M with use of cross compiler and how cross compile zlib, OpenSSL and ncurses needed to install nad run Asterisk.
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Hardware Acceleration of Longest Prefix Match
Kekely, Lukáš ; Tobola, Jiří (referee) ; Kořenek, Jan (advisor)
This bachelor's thesis describes design and implementation of hardware architecture for longest prefix match in order to achieve high throughput, which is required in today's high-speed computer networks. It is focused on IPv4 as-well-as IPv6 networks. Designed hardware architecture has throughput 75 Gbps on the shortest IPv4 and IPv6 packets. Performance of designed architecture is also compared with performance of chosen algorithms, which are used in nowadays commercial devices. These algorithms are: Tree Bitmap, Shape-Shifting Trie and Binary Search on Prefixes. All algorithms were implemented in C language using multi-threaded processing.
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Design and realization of client application for cooperation with ONET Modeler
Polak, Martin ; Jelínek, Mojmír (referee) ; Molnár, Karol (advisor)
The bachelor thesis „Design and realization of client application for cooperation with OPNET Modeler“ is about trying to bring a client to easier and better communication with the server. Open new opportunities for effective work in the network. Goal of this work is to interconnect two communication stations, which will together communivate. OPNET communicates with an external program which redirects the data to the network layer. The work describes the individual steps in creating a model client. Part of the work is introduction to the OPNET Modeler simulation environment, whereupon it is tied together a detailed desciption of programming of an external application.
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Registration database for IP nodes
Smrčka, Lukáš ; Vlček, Lukáš (referee) ; Komosný, Dan (advisor)
This thesis is focused on finding the physical location of stations by the passive geolocation techniques, particularly using the registration database of IP addresses. The first two part are focused on a theoretical analysis of this problem, the next two parts of this thesis deal with the solution of this problem and discussion of the results.
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Web application for getting location of IP nodes
Modrák, Zdeněk ; Kubánková, Anna (referee) ; Komosný, Dan (advisor)
Thesis deal with geolocation in internet network. There are described possibilities of geolocation and thesis is mainly focused on passive geolocation methods. Under passive geolocation belongs location databases which there are described as in theoretical way as used in practical part of thesis. In practical part there is created complex system for geolocation in internet environment which used paid and free geolocation databases. Another used database is WHOIS. Data from paid databases is processed and accuracy of databases is evaluated.
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Simulation of finding a computer position in Internet
Vrzal, Tomáš ; Jeřábek, Jan (referee) ; Komosný, Dan (advisor)
This bachelor’s thesis puts mind to problematic transmission multimedia data via RTP/RTCP protocol with hierarchical aggregation. In next parts of thesis are explaining design principle and use this transmission via tree structure. In last part is description application in which the simulation ambient uses tree structure. For best results of simulation is use algorithm called “binning”. Application has graphic interface, so that easy manipulation with it. In insertion are pictures and application code.
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Intelligent lightning system
Harman, Ján ; Šír, Michal (referee) ; Bradáč, Zdeněk (advisor)
The aim of my master’s thesis is a system for control of the light intensity. It is electronic equipment which controls the intensity of the light circuits based on settings and input signals. This equipment could work on single-phase systems or multiphase systems. The equipment is controlled by the signal DMX-512 which is a standard for the control of lighting technologies. The set up of this equipment is based on a personal computer or in a limited form by a small connected display.
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Draft of computer network model for Faculty of Science of University of South Bohemia
KOMŮRKA, Daniel
The purpose of this bachelor thesis is to design a computer network's scheme of the Faculty of Science for the upcoming centralization of services of the University of South Bohemia.The current state of the computer network will be mapped. The bachelor thesis will focus on logic topology. Part of the bachelor thesis is to determine suitable WLAN AP's and servers' location. Financial expenses of the proposed solution will be determined.
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Building and using computer network at NAREX Bystřice, s.r.o.
Babický, Lukáš ; Pinkas, Otakar (advisor) ; Kristen, Miloš (referee)
This bachelor's thesis deals with the operation of a small business network in firm Narex Bystřice, s.r.o. The main objective of the thesis is to present the current state of the network, highlight its errors and suggest corrective actions. The first part of the thesis considers the aspects that are needed for understanding the work of a computer network as a generic unit. There are discribed individual components, technologies, software topology and network security that are needed for the work of a computer network. In the practise part I describe its current state, highlight its deficiencies and suggest their corrections. Depending on the highlighted errors, individual solutions are suggested. The proposed solutions are presented to the company management. As subsequently agreed, the solutions are either implemented or cancelled.
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