IP and ATM integration: A New paradigm in multi-service internetworking

ATM is a widespread technology adopted by many to support advanced data communication, in particular efficient Internet services provision. The expected challenges of multimedia communication together with the increasing massive utilization of IP-based applications urgently require redesign of networking solutions in terms of both new functionalities and enhanced performance. However, the networking context is affected by so many changes, and to some extent chaotic growth, that any approach based on a structured and complex top-down architecture is unlikely to be applicable. Instead, an approach based on finding out the best match between realistic service requirements and the pragmatic, intelligent use of technical opportunities made available by the product market seems more appropriate. By following this approach, innovations and improvements can be introduced at different times, not necessarily complying with each other according to a coherent overall design. With the aim of pursuing feasible innovations in the different networking aspects, we look at both IP and ATM internetworking in order to investigating a few of the most crucial topics/ issues related to the IP and ATM integration perspective. This research would also address various means of internetworking the Internet Protocol (IP) and Asynchronous Transfer Mode (ATM) with an objective of identifying the best possible means of delivering Quality of Service (QoS) requirements for multi-service applications, exploiting the meritorious features that IP and ATM have to offer. Although IP and ATM often have been viewed as competitors, their complementary strengths and limitations from a natural alliance that combines the best aspects of both the technologies. For instance, one limitation of ATM networks has been the relatively large gap between the speed of the network paths and the control operations needed to configure those data paths to meet changing user needs. IP\u27s greatest strength, on the other hand, is the inherent flexibility and its capacity to adapt rapidly to changing conditions. These complementary strengths and limitations make it natural to combine IP with ATM to obtain the best that each has to offer. Over time many models and architectures have evolved for IP/ATM internetworking and they have impacted the fundamental thinking in internetworking IP and ATM. These technologies, architectures, models and implementations will be reviewed in greater detail in addressing possible issues in integrating these architectures s in a multi-service, enterprise network. The objective being to make recommendations as to the best means of interworking the two in exploiting the salient features of one another to provide a faster, reliable, scalable, robust, QoS aware network in the most economical manner. How IP will be carried over ATM when a commercial worldwide ATM network is deployed is not addressed and the details of such a network still remain in a state of flux to specify anything concrete. Our research findings culminated with a strong recommendation that the best model to adopt, in light of the impending integrated service requirements of future multi-service environments, is an ATM core with IP at the edges to realize the best of both technologies in delivering QoS guarantees in a seamless manner to any node in the enterprise

Diagnosing interoperability problems and debugging models by enhancing constraint satisfaction with case -based reasoning

Modeling, Diagnosis, and Model Debugging are the three main areas presented in this dissertation to automate the process of Interoperability Testing of networking protocols. The dissertation proposes a framework that uses the Constraint Satisfaction Problem (CSP) paradigm to define a modeling language and problem solving mechanism for interoperability testing, and uses Case-Based Reasoning (CBR) for debugging interoperability test cases. The dissertation makes three primary contributions: (1) Definition of a new modeling language using CSP and Object-Oriented Programming. This language is simple, declarative, and transparent. It provides a tool for testers to implement models of interoperability test cases. The dissertation introduces the notions of metavariables, metavalues and optional metavariables to improve the modeling language capabilities. It proposes modeling of test cases from test suite specifications that are usually used in interoperability testing performed manually by testers. Test suite specifications are written by organizations or individuals and break down the testing into modules of test cases that make diagnosis of problems more meaningful to testers. (2) Diagnosis of interoperability problems using search supplemented by consistency inference methods in a CSP context to support explanations of the problem solving behavior. These methods are adapted to the OO-based CSP context. Testers can then generate reports for individual test cases and for test groups from a test suite specification. (3) Detection and debugging of incompleteness and incorrectness in CSP models of interoperability test cases. This is done through the integration of two modes of reasoning, namely CBR and CSP. CBR manages cases that store information about updating models as well as cases that are related to interoperability problems where diagnosis fails to generate a useful explanation. For the latter cases, CBR recalls previous similar useful explanations

Disponibilidade, desempenho e segurança do ambiente de tecnologia da informação com acordo de nível de serviços utilizando ATM

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação.Este trabalho apresenta uma proposta para implementação de recursos visando assegurar uma alta disponibilidade e segurança do ambiente de Tecnologia da Informação. Serão considerados os aspectos do Acordo de Nível de Serviço (SLA - Service Level Agreement), a implementação da tecnologia ATM (Asynchronous Trasnfer Mode) integrada às redes convencionais. O trabalho apresenta algumas propostas para as diretrizes de segurança da informação de uma organização, visando preservar a confidencialidade, integridade e disponibilidade das informações da instituição. Esta proposta é aplicável aos sistemas informatizados e os meios convencionais de processamento, comunicação e armazenamento de informações. O trabalho pretende fomentar a busca de orientação para a conduta considerada adequada aos negócios e aos objetivos da organização. Serão recomendadas tecnologias adequadas ao backbone da rede e ao Server Farm, apontando os pontos indispensáveis para manter uma disponibilidade de acordo com as exigências de um SLA. Serão sugeridas políticas de proteção das informações contra desnutrição, modificação e divulgação indevida, quer sejam acidentais ou intencionais. Serão destacadas as alternativas do LANE como serviço de integração das LANs convencionais ao ATM e o VRRP - Virtual Route Redundance Protocol (RFC 2338) como serviço de aumento da disponibilidade no backbone ATM e no Server Farm

Ses, görüntü ve veri iletiminin ATM üzerinden MPLS uygulaması

06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır.Ağ uygulamalarında en güncel konulardan birisi İnternet kullanımının ve çokluortam gereksiniminin artmasından dolayı, LAN, WAN ve uzak bağlantılardases, veri ve video bilgilerinin birleştirilip tek bir hat üzerinden aktarılabilmesive son kullanıcıya kadar yüksek hızlarda bağlantının sağlanmasıbeklenmektedir.ATM teknolojisi, gerekli bant genişliği, yüksek hız ve kullanıcılara verdiğihizmetin kalitesi açısından yüksek performans sağlayan bir iletim teknolojisidir.Günümüzde ATM tabanlı ağların yerini IP tabanlı ağlar almaktadır. Bu geçişteen önemli problem, servis kalitesinin sağlanması ve hataları düzeltme hızınınSONET ağlarıyla rekabet edebilecek seviyeye getirilmesidir. Bu amaçla,özellikle MPLS ve GMPLS'in geliştirilmesiyle birlikte hata bağışıklığıgetirmeyi amaçlayan çeşitli protokoller ortaya çıkmıştır.MPLS tabanlı VPN ağları, Frame Relay ve ATM protokolünün sağladığıgüvenlik, OSİ.2. katman hızı ve servis kalitesini (QoS), TCP/IP protokolününsağladığı ölçeklenebilirlik, esneklik ve işletim kolaylığı özelliklerini aynı andakullanıcıya sunmaktadır. Gelişen teknolojiyle birlikte servis sağlayıcılarmüşterilerine çok kullanıcılı ortamlar sunup, pazar paylarını artırabilmek içingüvenilir ve yüksek kapasiteli ağlara ihtiyaç duymaktadırlar. Bu gereksinimlerikarşılayabilecek bir ağ düşük maliyetli ve geniş bir kullanıcı topluluğununisteklerine cevap verebilecek düzeyde olmalıdır. MPLS/IP yönlendirme yapanbir omurga üzerinde çalışmakta ve verilen servisle ilgili kararlar omurganın uçnoktalarında ek bir işlem yükü gerektirmeden yapılabilmektedir. MPLS aynızamanda Frame Relay'de ve ATM'de yapılması gereken karmaşık protokol veadres dönüşümlerini ortadan kaldırmaktadır. Uygulamalarda üst seviyekatmanındaki trafiği algılayarak, uygulamanın gerektirdiği servisleri sağlayanMPLS teknolojisi hızla gelişmekte ve ilerisi için gelecek vaad etmektedir.Bu tez çalışmasının amacı, ATM ve IP şebekelerini MPLS şebekesiylekarşılaştırıp, MPLS'nin getirdiği faydaları ve iyileştirmeleri simülasyonyardımıyla ortaya koymaktır.In network applications, because of the increase at internet and multimediarequisities and demands, one of the most actual subject is to combine sound, data andvideo informations via a single line to transmit them up to end user at high speedconnection rates.ATM technology is a transmission technology which provides essential bandwidth,high speed , and high quality service for their customers. Today, IP based Networkstake the place of ATM based Networks. In this transition, the most importantproblem is to provide service quality and to make lines capacitiy of error correctionspeed competitive compared to SONET Networks. With this purpose, especially withthe development at MPLS and GMPLS, various protocols which provide error -immunity has appeared.MPLS based VPN Networks serve security, OSI.2 Layer speed, Quality of Service(QoS) which are also provided by Frmae Relay and ATM protocol; measuribility,flexibility, operation comfort properties which are also provided by TCP/IP protocoltogether. With developing technology, Service Providers provide multi-usermediums and they need realible and high capacitive networks as to increase theirmarket shares. Networks which cover this necessities should be at lower cost leveland responsible for their broad customer community. MPLS/IP is working on arouter-backbone and successes commands without an additional process load onterminal backbones. At the same time, MPLS eliminates complicated protocols andaddress transformations which must be handled in Frame Relay and ATM. Inpractice, with sensing upper level layer?s traffic and providing requisite service forapplication, MPLS technology is developing rapidly and it promises future.The target of this thesis is to show benefits and remedies of MPLS compared toATM and IP Networks by encourage of simulation