Browsing by Author "Simba, Fatuma"

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    Determination of viable connectivity technology for e – learning in Tanzania: Case Study of Rural Secondary Schools
    (University of Dar es Salaam, 2012) Simba, Fatuma
    In response to different development challenges, Tanzania is striving to achieve her fourth attribute of the National Development Vision, i.e. to have a well educated and learning society by the year 2025. The earmarked approach is to integrate Information and Communication Technology (ICT) in education system (e-learning), in order to improve teaching and learning processes, hence provision of quality education. However, Tanzania is challenged by lack of ICT infrastructures in rural areas, which affects integration of ICT in education. This thesis presents a research work to determine a cost-effective and performance efficient connectivity technology for rural secondary schools to access e-learning resources. The research surveyed wireless technologies, in order to identify potential broadband access technologies suitable for rural areas of the developing countries. Because ICT is a very dynamic sector, the identified technologies were compared by using conceptual framework to study their sustainability and thereafter, analyzed by using techno-economic approach to determine a feasible and cost-effective option. Results show that, a third generation (3G) Universal Mobile Telecommunications System (UMTS) operating at 900MHz is a feasible and cost-effective connectivity technology for rural areas of Tanzania. Furthermore, the research employed a simulation modeling approach to study traffic differentiation and priority scheduling mechanisms in providing Quality of Service (QoS) for e-learning applications in UMTS networks. A simulation model of the UMTS network has been developed and used to study performance of e-learning applications as perceived by users. Simulation results showed that, UMTS network configured with traffic differentiation and priority scheduling can guarantee delivery of e-learning services with the required QoS. The Public Private People's Partnership (PPPP) model is proposed by this research as an implementation strategy for sustainable broadband rural connectivity solution.
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    Implementation of internet protocol virtual private network (IP-based VPN) connectivity in Tanzania.
    (University of Dar es Salaam, 2005) Simba, Fatuma
    Tanzania has a low diffusion of Internet Protocol (IP)-based services. The situation is caused by many factors: e.g. shortage of Information and Communication Technologies (ICT) equipment like computers; and connectivity challenges caused by limited network reach, capacity as well as security concerns, especially over public networks such as the internet. As a result, communications between distant offices are still mainly by landline phones and paper based method e.g. letters. While there is efforts to deploy and spread IP based services over public networks, such networks are known to have a security problem that makes it difficult to deliver trusted IP-based services. To spear head diffusion of IP-based services over IP-backbones while overcoming the security problem, Internet Protocol Security Virtual Private Network (IPSec-VPN) technique has been chosen and is recommended for use. This Thesis presents the design and implementation of a Wide Area Network (WAN) interconnecting computers in different, geographically dispersed secondary schools within Tanzania by using the IPSec-VPN technique. In this work, the linux-FreeS/WAN software was used to implement the desired IPSec protocol in the installation of the IPSec-VPN. Results suggest that the installed IPSec-VPN succeeded to provide a cost effective and secure connectivity solution to the selected secondary schools. Further, it has been found that, majority of IP backbones in Tanzania are urban-based backbones. However, the backbones are equipped with relevant and accessible networking equipments to implement IPSec-VPN service.