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Design of reliable enterprise networks with service quality support
Kiška, Martin ; Koutný, Martin (referee) ; Novotný, Vít (advisor)
This work deals with creating a reliable corporate network and its variety capabilities against loops and supporting QoS on link and network layer. On the basis of theoretical knowledge is designed an experimental network in the laboratory of Institute of Telecommunications composed of several computers, VoIP pohones, switches and routers. Functinonal network is then tested to failure of individual nodes and the impact on network traffic. In another part of this bachelor thesis this network is tested using different QoS support options.
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QoS simulation model in NS2
Balej, Jiří ; Burda, Karel (referee) ; Šimek, Milan (advisor)
In this bachelor thesis is described fundamental principle of IPTV and all the necessary conditions for high-quality video and audio signal. In reference is the recommendation of DSL Forum TR-126, where are summarized QoS parameters for IPTV. There is the explanation of Triple play service as a combined distribution of television, telephone and high-speed Internet. In one chapter are presented methods for asssure Quality of Service (QoS). There are described the method of Integrated services and especially Differentiated services. It explains a function of edge and core routers in Differentiated services. Methods for random early detection (RED) a scheduling are described too. The aim of this thesis was to create two laboratory tasks in the Network Simulator 2. The first lab simulates VoIP traffic in data network and assure QoS for VoIP. In the second lab is a simulated the network with Triple play service and the goal is to assure the recommended parameters for IPTV. To resolve the aim of this work, was needed to study the function of Network Simulator 2 and focus on settings for Differentiated services.
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Configuration of QoS in IP network using Cisco devices
Brož, Kamil ; Šporik, Jan (referee) ; Růčka, Lukáš (advisor)
This bachelor's thesis is divided into two main sections. The first, theoretical section, deals with parameters and requirements of modern real-time applications. This project analyses the particular means of providing QoS. It deals with access in a form of integrated services (IntServ) and with newer access in a form of differentiated services (DiffServ). The chapter covering the Integrated services describes the very basic principles of the problematics. Differentiated services and used algorithms are discussed in detail. The second, practical section, describes the capabilities of Cisco devices and their particular implementation in two designed network scenarios including traffic measurement and user experience tests.
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Possibilities of QoS algorithms simulation and optimization
Charvát, Ondřej ; Číka, Petr (referee) ; Krajsa, Ondřej (advisor)
The bachelor's thesis deals with problematics of data transmission control in converged networks which is implemented there to offer telecommunication services in desired quality. Theoretical part of the thesis provides an overview of measurable parameters and lists factors by which they are affected. It discusses different levels of services offered and finally techniques used for it's provisioning as they are implemented in network appliances. In practical part a model of network with QoS implementation is constructed in simulation software Simulink. There are several traffic flows running in the simulated network which has different demands on transfer quality such as telephony or bulky file transfer. There is graphical user interface programmed in Matlab enviroment by which it is possible to alter QoS settings in the model and observe effect on achieved parameters of running data transfers. All simulation results are also displayed on the user interface. User may set all parameters manualy or let the software optimize settings according to prefered criterion, i.e. packet loss. In such way model demonstrates how changes in QoS configuratinon affects quality of services being transferred. The whole model is constructed in a way to be easily reconfigured in case of future use. It is possible for expample to add more traffic or to extend the model to larger network by using predefined blocks.
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Service quality support in WLAN networks
Mizera, Josef ; Hošek, Jiří (referee) ; Novotný, Vít (advisor)
The bachelor´s thesis is focused on wireless networks WiFi and the transmission of multimedia using these networks. It discusses the connection of telecommunication and data networks, their common use for transfer of data in real time, particularly through wireless transmission medium using standards IEEE 802.11. It describes individual standards 802.11, mainly 802.11e on which is this bachelor´s thesis focused. The second part of the work is focused on designing the networks for measuring to verify the functionality of service quality support in the tested networks.
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Analysis of technologies for quality of services assurance in packet networks
Kulhány, Andrej ; Kouřil, Jiří (referee) ; Hošek, Jiří (advisor)
This bachelor thesis focus on analysis of technologies for guaranted quality of services in packet network. In main part I devote to detailed study of technologies IntServ and DiffServ. Practical part of my bachelor thesis includes design of network in simulating program Openet Modeler. Designed network is pecialized to guarantee quality of services during voice transmission by technology DiffServ. When designing the network I simulated guarantee of services in network without quality of service and in network with quality of services technology DiffServ. Finaly I compared issues of simulations.
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QoS in IP network with the help of OMNeT++ simulation tool
Hudec, Lukáš ; Mlýnek, Petr (referee) ; Růčka, Lukáš (advisor)
The content of this thesis is giving information about the network simulator OMNeT++ and its superstructure INET Framework. In this thesis a sample simulation of IP network with the help of simulation package INET Framework is realized on this theme. The thesis also deals with analysis of possibilities, how to assure quality service in IP networks and subsequently implementation quality of service in surrounding of network simulator OMNeT++ and its superstructure INET Framework. The implementation is accomplished by two methods. The first method is implementation of differential service, in other words DiffServ, with the help of change the behavior of output. This change rest in sorting of data packets to different queues by their device priority. The second method shows principles of the technology MPLS and also function code protocol OSPF. The MPLS technology is realized by special routers with implemented moduls reservation protocol.
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Evaluation of service quality parameters in data networks
Gregor, Lukáš ; Zeman, Václav (referee) ; Novotný, Vít (advisor)
The bachelor thesis deals about the issues of IP networks. About technologies for ensuring the quality of services, that is necessary to implement in today’s IP networks, due to the large increase of data flows. The bachelor thesis is oriented especially on technologies IntServ, DiffServ, MPLS and requirements of different types of services to the qualitative parameters of data networks. The aim of practical part is to devise a laboratory exercise for measuring qualitative parameters of different services under various condition in the intermediate network. Emulation of network parameters is carried out using emulation tool WANem with GNU Linux core.
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New Methods of Quality of Service Assurance in Data Networks
Hošek, Jiří ; Vozňak,, Miroslav (referee) ; Bešťák,, Robert (referee) ; Molnár, Karol (advisor)
The doctoral thesis is focused on a research in the area of the quality-of-service support technologies in data networks. The current modern communication networks cannot operate correctly without an effective tool allowing differentiated treatment for various network traffic classes. Looking at the current trends in this area it turns out that the technology of Differentiated services is currently the most widely used mechanism for QoS assurance in data networks. The major part of this doctoral thesis concerns the design of a novel QoS system which offers a solution for one of the main problems of DiffServ technology. This disadvantage lies in the missing cooperation between the end station and edge node of the DiffServ domain. To overcome this limitation the system proposed introduces an improvement which enables the user application to actively participate in the resource reservation process by direct configuration of the DSCP value in the IP header of its own packets. This functionality is based on the identification of DiffServ configuration parameters available in the edge router. To retrieve the information required from network component the well-known SNMP protocol has been chosen, which has direct access to the components’s configuration stored in the MIB database. On the basis of this theoretical proposal several simulation scenarios have been created and analysed. The results show that the system designed presents an efficient solution for the mentioned problem of DiffServ. They also give good assumptions for the successful implementation of this system into a real environment.
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