Orientador: Edmundo Roberto Mauro Madeira / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-08-22T03:57:24Z (GMT). No. of bitstreams: 1 SoaresJunior_MiltonAparecido_M.pdf: 2099044 bytes, checksum: 9429a525b941834e987d70cb3b26c2fc (MD5) Previous issue date: 2013 / Resumo: Apesar do seu sucesso, a arquitetura atual da Internet _e uma fonte de vários problemas para as aplicações atuais e as demandas futuras. A virtualização da infraestrutura da rede é proposta como alternativa para solucionar esses problemas sem a necessidade de alterar o núcleo da Internet, pois ela habilita o pluralismo de arquiteturas de rede. Neste trabalho, foi desenvolvida uma arquitetura de gerência autonômica de redes virtuais baseada em sistemas multiagentes. Um protótipo que realiza a função de autocura de redes virtuais foi implementado a partir dessa arquitetura. Novos algoritmos e mecanismos foram desenvolvidos para melhorar a eficiência do protótipo. Foi realizado, também, um estudo de caso sobre a gerência de redes virtuais que leva em consideração os requisitos das aplicações que estão sendo executadas em uma nuvem. Uma plataforma de experimentação baseada em máquinas virtuais e no OpenFlow foi criada para a execução dos experimentos. Tanto o protótipo quanto a plataforma de experimentação integram ferramentas atuais criando uma única solução para a gerência de redes virtuais. Os resultados apresentados contribuem para aproximar a virtualização de redes e a gerência autonômica da realidade / Abstract: Despite its success, the current architecture of the Internet is a source of many problems for current applications and future demands. The virtualization of network infrastructure is proposed as an alternative to solve these problems without the need to change the core of the Internet, as it enables the network architecture pluralism. We have developed architecture for autonomic management of virtual networks based on multi-agent systems. Based on this architecture, we implemented a prototype that performs the function of self-healing virtual networks. New algorithms and mechanisms have been developed to improve the efficiency of the prototype. A case study on the management of virtual networks that takes into consideration the requirements of the applications that are running on a cloud is also presented. For the execution of the experiments was created an experimentation platform based on virtual machines and on OpenFlow. The prototype and the platform integrate current tools creating a single solution for management of virtual networks. The results contributed to bring network virtualization and autonomic management closer to reality / Mestrado / Ciência da Computação / Mestre em Ciência da Computação

Orientadores: Leonardo de Souza Mendes, Mario Lemes Proença Junior / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-27T01:36:35Z (GMT). No. of bitstreams: 1 Amaral_AlexandredeAguiar_D.pdf: 3847801 bytes, checksum: 71773e4b12743836bc5dc38e572c1c63 (MD5) Previous issue date: 2015 / Resumo: A tarefa de gerenciamento de redes tem se tornado cada vez mais desafiadora. Dentre esses desafios está o problema de diagnosticar e solucionar as anomalias. As soluções atuais não têm sido suficiente para atender os requisitos demandados para a aplicação em ambientes de rede de grande escala. Os principais motivos decorrem da falta de autonomicidade e escalabilidade. Nesta tese, os conceitos da computação autonômica e distribuída são explorados para diagnosticar e solucionar anomalias de rede em tempo real. A proposta é constituída de entidades autonômicas hierarquicamente distribuídas, responsáveis por detectar e reparar as anomalias nas suas regiões de domínio com a mínima intervenção humana. Isto permite a escalabilidade, viabilizando a implantação do sistema em redes de grande escala. A autonomicidade das entidades autonômicas reduz intervenções manuais e a probabilidade de erros na análise e tomada de decisão, fazendo com que a complexidade percebida pela gerência no processo de detecção de anomalias seja reduzida. Experimentos foram realizados em duas diferentes redes: Universidade Tecnológica Federal do Paraná ¿ Campus Toledo e no Instituto Federal de Santa Catarina ¿ Campus GW. Os resultados demonstraram a eficácia e autonomicidade da solução para detectar e tratar diferentes anomalias em tempo real, com a mínima intervenção humana / Abstract: The challenges inherent to network administration increase daily. Among these challenges, there is the problem of diagnosing and repairing network anomalies. Current solutions have not been enough to meet the requirements of large scale networks. The main reasons stem from the lack of autonomicity and scalability. In this thesis, autonomic and distributed computing concepts are exploited presenting a solution to diagnose and treat network anomalies in real time. In this pro-posal, autonomic entities are hierarchically distributed, being responsible for detecting and repair-ing the anomalies in their domain, with minimal human intervention. This provides scalability, enabling the system to be deployed in large scale networks. The autonomic entities autonomicity reduces the manual intervention and the likelihood of errors in the analysis and decision process, minimizing the complexity perceived by the network management in the anomaly detection pro-cedure. Experiments were performed at two different networks: Federal University of Technolo-gy Paraná (UTFPR) - Toledo Campus and at the Federal Institute of Science and Technology Santa of Catarina - GW Campus. The results demonstrated the efficacy of the solution and its autonomicity to detect and repair various anomalies in real time, with minimal human interven-tion / Doutorado / Telecomunicações e Telemática / Doutor em Engenharia Elétrica

Indiana University-Purdue University Indianapolis (IUPUI) / Today, Wireless Sensor Networks (WSNs) are forming an exciting new area to have dramatic impacts on science and engineering innovations. New WSN-based technologies, such as body sensor networks in medical and health care and environmental monitoring sensor networks, are emerging. Sensor networks are quickly becoming a flexible, inexpensive, and reliable platform to provide solutions for a wide variety of applications in real-world settings. The increase in the proliferation of sensor networks has paralleled the use of more heterogeneous systems in deployment. In this thesis, our work attempts to develop a new network management and data collection framework for heterogeneous wireless sensor networks called as Heterogeneous Wireless Sensor Networks Management System (H-WSNMS), which enables to manage and operate various sensor network systems with unified control and management services and interface. The H-WSNMS framework aims to provide a scheme to manage, query, and interact with sensor network systems. By introducing the concept of Virtual Command Set (VCS), a series of unified application interfaces and Metadata (XML files) across multiple WSNs are designed and implement the scalability and flexibility of the management functions for heterogeneous wireless sensor networks, which is demonstrated though through a series of web-based WSN management Applications such as Monitoring, Configuration, Reprogram, Data Collection and so on. The tests and application trials confirm the feasibility of our approach but also still reveal a number of challenges to be taken into account when deploying wireless sensor and actuator networks at industrial sites, which will be considered by our future research work.

No description available.

Resource Management is an extremely important concern for the network manager. Of the bus, ring and the star network topologies, usually employed in a local area network, the bus topology provides the highest reliability. However, peer-to-peer protocols usually followed in such a topology, make it extremely difficult to incorporate resource management features at a lower level of network architecture. This thesis presents design considerations for a session-level network controller, to be implemented on a local area network with a bus topology. The controller, will provide essential resource management, and attempt to improve the throughput of the network. The design is based on a single-board computer, and a streamlined operating system is also included in the design. It is claimed that such an environment will be ideal for networking tasks, like the controller presented. The design is software-oriented, though device selection is discussed, both for the controller and its network interface. The local area network used for the development of this project is a sixteen hundred node campus network at Virginia Tech ( using LocalNet 20) supplied by SYTEK, Inc. / M.S.

The purpose of this project was to develop a tool / utility for network administrators to maintain information about all the systems operated by the College of Natural Sciences at California State University, San Bernardino.

Thesis (MAcc (Accountancy))--University of Stellenbosch, 2007. / The purpose of this assignment is to ascertain whether the COBIT framework is an adequate framework to assist in the governance of virtual private networks. The assignment focuses on whether the framework can ensure the identification of virtual private network-related risks and address IT compliance with policies and statutory regulations. A brief summary of the risks and issues pertaining to the pre-implementation, implementation and post-implementation phases of virtual private networks is included in the assignment. These risks and issues are then individually mapped onto a relevant COBIT control objective. The scope of the assignment does not include the intricacies of how these networks operate, the different types of network topologies or the different technologies used in virtual private networks. It was found that the COBIT framework can be implemented to manage and/or mitigate virtual private network risks.

This research is concerned with the technoeconomic aspects of modern and next-generation telecommunications including the Internet service. The goal of this study thereof is tailored to address the following: (i) Reviewing the technoeconomic considerations prevailing in telecommunication (telco) systems and their implicating futures; (ii) studying relevant considerations by depicting the modern/next-generation telecommunications as a digital ecosystem viewed in terms of underlying complex system evolution (akin to biological systems); (iii) pursuant to the digital ecosystem concept, co-evolution modeling of competitive business structures in the technoeconomics of telco services using dichotomous (flip-flop) states as seen in prey-predator evolution; (iv) specific to Internet pricing economics, deducing the profile of consumer surplus versus pricing model under DiffServ QoS architecture pertinent to dynamic- , smart- and static-markets; (v) developing and exemplifying decision-making pursuits in telco business under non-competitive and competitive markets (via gametheoretic approach); (vi) and modeling forecasting issues in telco services addressed in terms of a simplified ARIMA-based time-series approach, (which includes seasonal and non-seasonal data plus goodness-fit estimations in time- and frequency-domains). Commensurate with the topics indicated above, necessary analytical derivations/models are proposed and computational exercises are performed (with MatLabTM R2006b and other software as needed). Extensive data gathered from open literature are used thereof and, ad hoc model verifications are performed. Lastly, results are discussed, inferences are made and open-questions for further research are identified. / by Renata Cristina Tourinho Sardenberg. / Thesis (Ph.D.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

Ad-Hoc mesh networks offer great promise. Low-cost ad-hoc mesh networks can be built using popular IEEE 802.11 equipment, but such networks are unable to guarantee each node a fair share of bandwidth. Furthermore, hidden node problems cause collisions which can cripple the throughput of a network. This research proposes a novel mechanism which is able to overcome hidden node problems and provide fair bandwidth sharing among nodes on ad-hoc 802.11 networks, and can be implemented on existing network devices. The scheme uses TDM (time division multiplexing) with slot reservation. A distributed beacon packet latency measurement mechanism is used to achieve node synchronisation. The distributed nature of the mechanism makes it applicable to ad-hoc 802.11 networks, which can either grow or fragment dynamically.

Orientadores: Leonardo de Souza Mendes, Mario Lemes Proença Junior / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-16T19:18:19Z (GMT). No. of bitstreams: 1 Zarpelao_BrunoBogaz_D.pdf: 5089650 bytes, checksum: 281e7d926aae4a7e05a2e94347a06179 (MD5) Previous issue date: 2010 / Resumo: Anomalias em redes de computadores são desvios súbitos e acentuados que ocorrem no tráfego em consequência de diversas situações como defeitos em softwares, uso abusivo de recursos da rede, falhas em equipamentos, erros em configurações e ataques. Nesta tese, é proposto um sistema de detecção de anomalias em redes de computadores baseado em três níveis de análise. O primeiro nível de análise é responsável por comparar os dados coletados em um objeto SNMP (Simple Network Management Protocol) com o perfil de operações normais da rede. O segundo nível de análise correlaciona os alarmes gerados no primeiro nível de análise utilizando um grafo de dependências que representa as relações entre os objetos SNMP monitorados. O terceiro nível de análise reúne os alarmes de segundo nível utilizando informações sobre a topologia de rede e gera um alarme de terceiro nível que reporta a propagação da anomalia pela rede. Os testes foram realizados na rede da Universidade Estadual de Londrina, utilizando situações reais. Os resultados mostraram que a proposta apresentou baixas taxas de falsos positivos combinadas a altas taxas de detecção. Além disso, o sistema foi capaz de correlacionar alarmes gerados para diferentes objetos SNMP em toda a rede, produzindo conjuntos menores de alarmes que ofereceram ao administrador de redes uma visão panorâmica do problema / Abstract: Anomalies in computer networks are unexpected and significant deviations that occur in network traffic due to different situations such as software bugs, unfair resource usage, failures, misconfiguration and attacks. In this work, it is proposed an anomaly detection system based on three levels of analysis. The first level of analysis is responsible for comparing the data collected from SNMP (Simple Network Management Protocol) objects with the profile of network normal behavior. The second level of analysis correlates the alarms generated by the first level of analysis by using a dependency graph, which represents the relationships between the SNMP objects. The third level of analysis correlates the second level alarms by using network topology information. The third level generates a third level alarm that presents the anomaly propagation path through the network. Tests were performed in the State University of Londrina network, exploring real situations. Results showed that the proposal presents low false positive rates and high detection rates. Moreover, the proposed system is able to correlate alarms that were generated for SNMP objects at different places of the network, producing smaller sets of alarms that offer a wide-view of the problem to the network administrator / Doutorado / Telecomunicações e Telemática / Doutor em Engenharia Elétrica