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QoS Implementation in Access Network
Adámek, David ; Molnár, Karol (referee) ; Filka, Miloslav (advisor)
This diploma thesis deals with computer networks which play a key role in present society. More and more demands are placed on these networks (especially on quality of services and throughput) because of fast-growing developement of services such as voice and video real-time transmissions. All the packets in typical Ethernet networks are equal. Therefore it is sometimes impossible for the application to maintain required throughput speed of a network. For this case it is useful to take some mechanisms into the consideration. These mechanisms (sometimes called QoS) are able to distinguish different types of transmissions and traffic, analyze them and then prioritize them according to some pre-defined set of rules. The most famous mechanisms are Integrated Services and Differentiated Services. The implementation of Differentiated Services is the goal of this thesis.
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Quality of services support in the end applications
Zelinka, Jiří ; Novotný, Vít (referee) ; Hošek, Jiří (advisor)
The topic of this diploma thesis has been chosen for a discussion and implementation of quality of service on the application and link layer of the OSI model. At the beginning of this thesis the general parameters and basic technologies of the OSI model network layer has been explained. This part was chosen as a resource for explanation of the basic parameters in the quality of services. Basic part is followed by the introduction to the Ethernet technology, which became as a ground for the real model in this diploma thesis. As a part of this section has been written a block which contains a analysis of quality of services in the Ethernet, which means the implementation of IEEE 802.1Q/p. This analysis is followed by structured descrition of the controlling and functionality of quality of services parameters on the link layer with the system tool in the Windows XP, description of Win XP link layer drivers and its modification with system tool tcmon. The end of the theoretical part is represented by introduction to the implementation of quality of service in the wireless networks especially the 802.11e standard. At the beginning of the practical part is specified the description of the topology design which is dedicated to the quality of services implementation. This section is developed to well-founded analysis of applications which were used during topology creating. The last segment of this thesis is dedicated to evolving the practical informations which were obtained during the measurement.
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Routing protocols in scale-free topology networks
Mahdal, Ondřej ; Kyselý, František (referee) ; Skořepa, Michal (advisor)
This master's thesis (further only MT) deal with problems of scale-free topology networks with a view to technology MANET (Mobile Ad hoc network) or more precisely Motorola MESH. Further studies routing technique and quality of services (QoS) in these networks. Theoretic part of MT in introduction shortly characterizes properties and kind of Ad hoc networks, next part is dedicated to technology Motorola MESH and shows practical usage of this technology. Analysis of problems quality of services and optimalization QoS in MANET is content third parts of MT. Fourth part specifies division of routing protocols, analysis of routing in MANET and characteristics routing protocols OLSR, AODV, DSR and TORA. In practical fifth part of MT are in introduction simulated simple MANET and mesh networks and further is created model of MANET network, into the model are implemented accessible routing protocols in simulation program OPNET Modeler and on the basis of simulation these protocols or more precisely output statisticians of simulation are protocols compared from several aspects and suitability for transmission of multimedia data (voice, video).
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Quality of Services in WAN
Koblížek, Michal ; Heriban, Pavel (referee) ; Šťastný, Jiří (advisor)
This bachelor thesis is inquire into direct traffic in computer network based on TCP/IP protocol. In the finish we can direct packets, that network traffic will behave by our rules. We will use only free software for this solution – this solution is based on FreeBSD system, PF packet firewall and queue framework ALTQ. Part of this thesis make examples queuing include fullversion scripts that are in elektronic appendix. The thesis was developed in research project MSM 0021630529 Intelligent Systems in Automation.
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QoS in a computer network of VŠE
Kalina, Tomáš ; Pavlíček, Luboš (advisor) ; Beneš, Jiří (referee)
The diploma thesis is focused on analysis and deployment of Quality of Services (QoS) in a computer network of The University of Economics in Prague (VŠE). The thesis describes the main QoS technologies focusing on technology Diffserv and its deployment with using available network devices in computer network of VŠE. In thesis the needs of network services and protocols for quality of services with division into different classes of services according to priority are discussed. The thesis explains the benefits and drawbacks of deploying QoS in the environment of VŠE with regard to wired and wireless network. In the practical part recommendations are applied to the production network and subsequently the benefits of modification are evaluated.
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VoIP - new way of communication
Černý, Jan ; Pavlíček, Antonín (advisor) ; Škop, Miroslav (referee)
The subject of this bachelor thesis is IP telephony as a new way of communication capable of replacing the current analogue telephony adequately. The aim is to introduce the VoIP environment, principles and also its real use. The thesis is divided into three parts. The first part is focused on the above mentioned environment as well as on used layers and protocols of OSI and TCP/IP models. The second part looks into the VoIP technology itself, from voice digitalization to voice transfer using various protocols. Discussed is older signalization protocol H.323 and its successor SIP. Furthermore the chapter examines various VoIP types and threads to VoIP as well as terms like QoS or ENUM. The third part contains a case study of implementing VoIP in practise. The case study shows matters that need to be taken into consideration when implementing this technology but mainly reveals how much can be saved per month, how big is the initial investment and its rate of return.
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Creation of router based on Linux
SUDA, Jiří
This thesis describes routers in general and their variants as well as the creation of my own PC issues linux-based router variant. It states pros and cons of this solution in detail. The administration and security are also mentioned.
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VoIP- IP network voice communication
BERAN, Václav
The possibility for using the VoIP technology as an alternative solution for the te-lephone system is very attractive. The main reason is the widely expanded computer sites and also their higher effectiveness. The main goal of the work is to describe the VoIP technology and create the first publication in Czech republic which deals with this theme in details. First of all I concentrate on the explanation of the basic words, conceptions and principles necessary to fully understand the whole field. The main scope of the work is VoIP technology which is described in third chapter. There are described also the methods of voice coding, signalling protocols (SIP, H.323, MGCP, IAX) and issues related with QoS. The work also covers the Skype program with descriptions of it's principles, installation and control.
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