My thesis deals with the Multicast transfer in IP networks and it describes distribution technology of packets with special focus on Multicast technology. The thesis is devoted to the principles of Multicast including the description of scheme, protocol Multicast distribution, registration in the Multicast groups and finally the advantages and disadvantages of the Multicast transfer. Further in the thesis is described in details the Source Specific Multicast technology (SSM) that comes from multicast. There is a description how this technology Works and its implementation in the network equipment including the user side. This part of the thesis also deals with so called Distribution Trees that are used as multicast distribution via the IP networks like for example Internet. Based on the knowledge of the Multicast was created the network to spread the multimedia data with support of Multicast and SSM. The network is designed based on the Cisco system equipment as is: Cisco Content Engine 566, Cisco IP/TV broadcast server and router 1812. This multimedia network provides many services including the live TV broadcast and video channels. In this network using the multicast distribution of packets was done an analysis by protocol analyzer unit WIreshark and Finisar. This protocol analyzer unit allows us to compare the efficiency of multimedia data transfer between the Unicast, Multicast and SSM.

This work deals with a monitoring application for multicast sessions. The general aim is to develop the application for monitoring multicast sessions from network elements of a laboratory computer network. The first part describes possibilities of monitoring computer networks in terms of monitoring techniques and protocols. The second part contains a topology of the laboratory computer network and several basic commands for setting of the multicast in Cisco IOS. The third part is devoted to the developed application for monitoring the multicast in Java language. The last part describes the testing on an actual multicast network and an example of such testing is stated there.

This diploma thesis is focused on the implementation of the technology VoIP in the remote branch offices of a big company. There are used the current WAN lines, which have been so far used only for transfer of data. Implementation of IP telephony is extending the utilization of those lines and at the same time the costs for running of the telephone services are reduced. There are described the models for proposal and also the proposal for solution of IP telephony for a specific company.

Issue of this diploma thesis is focused on analysis of audio codecs used within IP telephony. Attention of teoretical part is given mostly to audio codecs according to ITU-T recommendations, but also to signaling protocols used here. For practical part of analysis is chosen router Cisco 2821 and IP phones Cisco 7975G. Configuration is done over operating system Cisco IOS. Chosen signaling protocol is SCCP. For analysis itself are chosen 2 analysers – L-580FX and Fluke NetTool. These are used in combination with program Wireshark. Analysed parameters are latency, packet lost, bandwidth, jitter and mean opinion score. Measured values are presented in graphs and tables and they are discussed. Next output of the thesis is laboratory excercise, which deals with analysis of audio codecs.

Das Chemnitzer StudentenNetz (CSN) verwaltet ein mittelgroßes Netzwerk in den Wohnheimen des Studentenwerkes Chemnitz-Zwickau. Mitarbeitern und Interessenten erhalten einen Überblick und Einblick in die vorhandene Netzstruktur und die Konfiguration der verwendeten Technik. Es wird auch auf mögliche Szenarien für zukünftige Entwicklungen eingegangen.

The mountain whitefish (Prosopium williamsoni) has been largely overlooked in population genetic analyses despite its wide distribution in discrete drainage basins in western North America for over four million years. Its closest sister taxa the Bear Lake whitefish (P. abyssicola), Bonneville cisco (P. gemmifer), and Bonneville whitefish (P. spilonotus) are found only in Bear Lake Idaho-Utah and were also included in the analyses. A total of 1,334 cytochrome b and 1,371 NADH dehydrogenase subunit 2 sequences from the Bonneville Basin, the Columbia River Sub-basin, the lower Snake River Sub-basin, the upper Snake River Sub-basin, the Green River Basin, the Lahontan Basin, and the Missouri Basin were examined to test for geographically based genetic differentiation between drainage basins and sub-basins and phylogeographic relationships to determine the invasion route of Prosopium into western North America and to aid in understanding current relationships. Prosopium entered the region via the Missouri River connection to Hudson Bay and moved in two waves: one colonized the lower Snake River Sub-basin, Columbia River Sub-basin, and the Lahontan Basin; the second wave colonized the upper Snake River Sub-basin, Bonneville Basin, Green River Basin, and established the Bear Lake Prosopium. Mountain whitefish exhibit a large amount of geographical genetic differentiation based on drainage basin except between the upper Snake River and the Bonneville Basin while the Bear Lake Prosopium show large amounts of gene flow between the three species. The apparent paraphyly of the mountain whitefish and the limited genetic structure of the Bear Lake Prosopium warrant recognition in the management of Prosopium and raise questions regarding species definitions in the group.

Thesis (MBA)--Stellenbosch University, 2006. / ENGLISH ABSTRACT: In South Africa more people are living with AIDS than in any other country in the world. It is now evident that HIV/AIDS has developed into a pandemic that not only affects the health of individuals, but does expand to households, communities and the nation. The stigma of HIV/AIDS is most likely the single most important reason why people, organisations and the government tend to shy away from the problem. The prime aim of business is to make money, but the fact that AIDS affects people at the peak of their productive years when they would normally not require medical attention, will impact negatively on the organisation's bottom line results. Apart from government, business is the only group that has the capacity and resources to successfully implement strategies in the fight against HIV and AIDS. This study provides a theoretical introduction to HIV and AIDS but also indicates that small to medium size organisations are slow to react to the threat that HIV and AIDS will have to their business and also the country. The study shows that large organisations have definitely been successful in their fight against the disease. The study concludes that knowing the prevalence rate of HIV in a organisation and adapting the strategy accordingly is essential for long term sustainability of the organisation. CISCO was selected as the case study to substantiate the above-mentioned opinions and conclusions. / AFRIKAANSE OPSOMMING: In Suid Afrika woon daar meer mense met VIGS as enige in enige ander land in die wereld. Dit is tans duidelik dat MIV/VIGS ontwikkel het in 'n pandemie wat nie net die gesondheid van individue raak nie, maar wat ook uitkring na huishoudings, gemeenskappe en die nasie. Die stigma van MIV/VIGS is heel waarskynlik die grootste enkele rede waarom organisasies en die regering wegskram van die probleem. Die hoofdoel van 'n besigheid is om wins te maak, maar die feit dat VIGS mense tydens die toppunt van hulle produktiewe jare affekteer wanneer hulle normaalweg geen mediese versorging sou benodig nie, gaan 'n negatiewe effek op organisasies se winsgewendheid hê. Behalwe vir die regering is privaat besighede die enigste groep wat beskik oor die kapasiteit en hulpbronne om strategiee te implimenteer wat suksesvol sal wees in die stryd teen MIV en VIGS. Hierdie studie gee 'n teoretiese inleiding oor MIV en VIGS. Dit dui ook daarop dat klein tot medium grootte organisasies stadig reageer op die bedreiging wat MIV en VIGS vir hul besigheid en die land kan inhou. Die studie toon dat groter organisasies meer sukses behaal in hulle stryd teen die siekte. Die studie bevind dat dit vir die volhoubaarheid van 'n organisasie belangrik is om te weet wat die voorkoms syfers van MIV in die organisasie is en die strategie ten opsigte van MIV en VIGS dienooreenkomstig aan te pas. CISCO is as 'n gevallestudie gebruik om bogenoemde waarnemings en aanbevelings te staaf.

The aim of this thesis project to design and implement a campus network based on IPv6, as IPv6 is the protocol of the future communication.There are many papers available which discuss upgrade from IPv4 to IPv6 and their side by side implementations and functionalities. Contrary to this we are working on running a network entirely based on IPv6. So we built this network infrastructure, monitored it and tested it.A network working on IPv6 is not just about a different addressing plan. Rather there are some serious questions. Network administrators are quite happy and comfortable with the current setup of IPv4. Would this IPv6 be able to provide them same facilities on one-to-one basis? If not, would it be upgrade or degrade on some functionality? Is there solution to every problem available or they would have to discover it themselves? All these and many more questions were faced and tackled in the course of this thesis.

The Catalyst 6500 is a modern commercial switch, capable of processing millions of packets per second through the utilization of specialized hardware. One of the main hardware components aiding the switch in performing its task is the Ternary Content Addressable Memory (TCAM). TCAMs update themselves with data relevant to routing and switching based on the traffic flowing through the switch. This enables the switch to forward future packets destined to a location that has already been previously discovered - at a very high speed. The problem is TCAMs have a limited size, and once they reach their capacity, the switch has to rely on software to perform the switching and routing - a much slower process than performing Hardware Switching that utilizes the TCAM. A framework has been developed to analyze the switch’s performance once the TCAM has reached its capacity, as well as measure the penalty associated with a cache miss. This thesis concludes with some recommendations and future work.

The Catalyst 6500 is a modern commercial switch, capable of processing millions of packets per second through the utilization of specialized hardware. One of the main hardware components aiding the switch in performing its task is the Ternary Content Addressable Memory (TCAM). TCAMs update themselves with data relevant to routing and switching based on the traffic flowing through the switch. This enables the switch to forward future packets destined to a location that has already been previously discovered - at a very high speed. The problem is TCAMs have a limited size, and once they reach their capacity, the switch has to rely on software to perform the switching and routing - a much slower process than performing Hardware Switching that utilizes the TCAM. A framework has been developed to analyze the switch’s performance once the TCAM has reached its capacity, as well as measure the penalty associated with a cache miss. This thesis concludes with some recommendations and future work.