The IP protocol suite has been initallyi designed to provide best effort reachability among the nodes of a network or an inter-network. The goal was to design a set of routing solutions that would allow routers to automatically provide end-to-end connectivity among hosts. Also, the solution was meant to recover the connectivity upon the failure of one or multiple devices supporting the service, without the need of manual, slow, and error-prone reconfigurations. In other words, the requirement was to have an Internet that "converges" on its own. Along with the "Internet Boom", network availability expectations increased, as e-business emerged and companies started to associate loss of Internet connectivity with loss of customers... and money. So, Internet Service Providers (ISPs) relied on best practice rules for the design and the configuration of their networks, in order to improve their Quality of Service. The goal of this thesis is to complement the IP routing suite so as to improve its resiliency. It provides enhancements to routing protocols that reduce the IP packet losses when an IP network reacts to a change of its topology. It also provides techniques that allow ISPs to perform reconfigurations of their networks that do not lead to packet losses.

<p>Rapporten handlar om routing och då med inriktning på interna routingprotokoll i första hand.</p><p>Studien är gjord med inriktning mot operatörernas nät, där det först finns en teoridel som beskriver det olika teknologierna och protokollen.</p><p>Sedan diskuteras hur det ser ut ifrån operatörernas sida och avslutas med en slutsats hur det ser ut i verkligheten idag..</p>

Information System (IS) effectiveness assessment is an important issue for the organizations as IS have become critical for their survival. With the incorporation of Internet technologies into the business environment, it is now more difficult to measure IS effectiveness, because Internet provides a borderless, non-stop, flexible communication medium. Assessing the effectiveness of web-based information systems (WIS) is vital for survival and competitive advantage which is a complicated subject since there are several interacting factors to consider. In the literature there are several methods proposed for IS assessment. However, those studies have been far from providing a broad, comprehensive evaluation framework for any type of web-based IS independent of its domain. In this study, a generic WIS effectiveness assessment framework is proposed. The framework is applied in case studies consisting of four organizations in e-commerce and e-banking domains.

Rapporten handlar om routing och då med inriktning på interna routingprotokoll i första hand. Studien är gjord med inriktning mot operatörernas nät, där det först finns en teoridel som beskriver det olika teknologierna och protokollen. Sedan diskuteras hur det ser ut ifrån operatörernas sida och avslutas med en slutsats hur det ser ut i verkligheten idag..

Governance, Risk and Compliance (GRC) Information Systems (IS) as an integrated technology has been introduced recently to facilitate the demanding operational and financial environment of the enterprises. The implementation process and the adoption of such systems is considered as a significant parameter influencing the success of operational performance and financial governance and could support the competitive advantage practices within the organisations. However, GRC literature is limited regarding the analysis of the implementation and adoption success. Therefore, there is a need for further research and contribution about these systems and more specifically their implementation process. Consequently, this investigation and analysis can provide an insight of this process by examining the aspects of the implementation, the lifecycle phases followed and the enterprise value drivers in each of these phases. Therefore, a framework was developed for structuring the analysis of this implementation including all these three elements as these were provided by the theoretic background. The empirical context of this research includes three field investigation studies based on the experience of key implementation stakeholder groups as participants. These investigation studies were analysed using thematic techniques following an interpretative qualitative analysis approach. It was proved that organisations have, directly or indirectly, followed specific lifecycle phases when they implement GRC systems as these are also described in the framework. Also they should consider specific aspects about the GRC systems and enterprise value drivers for the different lifecycle phases but also for a holistic approach of the implementation process. Hence new GRC implementation projects can use the phases and the analysis of these elements to facilitate and ease their decision-making and strategic planning before launching the implementation project. The analysis of the GRC implementation proved that a strict GRC environment can be established in the organisations through the successful implementation of a GRC technology. The implementation process of such technologies would require a preparation for the organisational environment in order the implementation project to succeed the GRC goals and the system to be integrated and optimised harmoniously within the enterprise environment. This study provides insight of how this implementation projects could be planned and developed and gives a directive blueprint for preparing organisations hosting such technological initiatives. The results of all field investigation phases, which can be considered as the contributions to theory and practice of this research, can have twofold implications: initially the development of a theoretical framework based on enterprise systems theories, and also an analysis of the GRC implementation process in specific. The framework is designed to structure the analysis of the GRC implementation aspects, the lifecycle phases and the enterprise value drivers of the GRC implementation process. This framework is used for visualising and structuring a specific analysis of the GRC adoption and success, and therefore this analysis can be used by practitioners and researchers to further evaluate and analyse this process. Furthermore, organisations can use this analysis for decision-making processes; as this analysis can provide a primary view for the implementation projects.

Diploma work is focused on implementation Business Intelligence applications in medium software company in order to support Corporate Performance Management. It creates suitable metrics portfolio according to Balanced Scorecard methodology. Implementation part presents development of the reporting system on the Cognos 8 BI platform in the current software company environment. The system evaluates the metrics every month. Metrics values are based on current data in transactional system. Diploma work has two parts: theory and reporting project. Theoretical part deals with BI system architecture in general. It is focused on reporting issues. It analyses typical usage and expected benefits of BI applications used for Corporate Performance Management in order to specify applications that are suitable for implementation in the company environment. Next issue of the theoretical part deals with IS development methodology that can be used in Business Intelligence projects. According to chosen criteria and weights with regard to this project it evaluates the best methodology for this project. It will be used in the next part. Practical part reporting project is both about development issues and usage the BI application from the end user view. This example provides information about activities, which are necessary for this development from initial study to testing phase. Project scope includes analysis of the environment, analysis of used metrics, design new metrics, metrics selection and implementation on Cognos platform. This example presents analytical usage of the Metric Studio tool and dymamical reports usage from the manager's view. The final part brings together critical success factors (CSF), which appear in this project.

This diploma thesis describes a careful selection of an information system for Ekoplast Telc Ltd Company. Theoretical part deals with a problematic of information systems, ERP systems, and their evaluation and assessment in general. Practical part focuses on an analysis of the currently used system, main requirements and criteria for newly selected system. In addition to that, an evaluation of the preferred options, a choice of an effective system, and a proposal of its alteration as well as an overall economic assessment is included in this part.

<p>This thesis is an experimental study to evaluate the performance of different routing protocols in commonly deployed scenarios. This study mainly focuses on how much time each protocol consumes while recovering from a link-loss. It provides a guide line for the best routing solutions for ISPs, individual organizations or other types of providers which are engaged in providing reliable real-time communications to their subscribers. Such communications may include vehicle trafficking data, online TV programs (IPTV), voice over IP telephony (VoIP), weather forecasts, tracking systems and many other services which totally depend upon the reliability of real-time data streams, where any major loss in received data may bring significant negative results in the integrity of the entire application.</p><p>This work experimentally observes and tracks the loss of UDP packets when changes in the network topology occur. In order to make this observation in real network topologies, a custom-designed software tool has been developed. The tool is capable of delivering enough resources to a tester in evaluating the performance of routing protocols. All the test results derived from the software tool are statistically evaluated and on the basis of the outcome a better proposition can be provided to network administrators which face inconsistent topological issues.</p>

This thesis is an experimental study to evaluate the performance of different routing protocols in commonly deployed scenarios. This study mainly focuses on how much time each protocol consumes while recovering from a link-loss. It provides a guide line for the best routing solutions for ISPs, individual organizations or other types of providers which are engaged in providing reliable real-time communications to their subscribers. Such communications may include vehicle trafficking data, online TV programs (IPTV), voice over IP telephony (VoIP), weather forecasts, tracking systems and many other services which totally depend upon the reliability of real-time data streams, where any major loss in received data may bring significant negative results in the integrity of the entire application. This work experimentally observes and tracks the loss of UDP packets when changes in the network topology occur. In order to make this observation in real network topologies, a custom-designed software tool has been developed. The tool is capable of delivering enough resources to a tester in evaluating the performance of routing protocols. All the test results derived from the software tool are statistically evaluated and on the basis of the outcome a better proposition can be provided to network administrators which face inconsistent topological issues.

In this thesis, we describe the principles of IS-IS routing protocol. We introduce the current state of implementation of this protocol within the simulation framework OMNeT++. We present the implementation of the IS-IS protocol created within the ANSA project. Moreover, we employ its variant called TRILL that is nowadays deployed as replacement of STP in data-center environment. The aim is to enable the modelling of the protocols without the need having to build physical architecture.