Zul chpter 3

Peer-to-Peer Computing, 2001. Proceedings. First …, 2001

This paper is an overview of the technologies that are neededfor Peer-to-Peer (P2P) computing. It represent a high level overview ofmaterial covered in much greater detail in [I]. P2P means different things to different people, and we start by defining P2P and categorizing applications that use P2P. Server-mediated P2P is included as a legitimate P2P architecture. The applications space is divided into three types: distributing computing, content sharing, and collaboration. A,jter a discussion of what is required from an infrastructure f o r P2P we describe some solutions that address a class of applications each, but also include a start towards a general-purpose architecture. The same basic services are needed by each platform and application, and all will benefit .from common middleware. This is one way, though not the only one, to achieve interoperabilitythat will be useful to users and application developers; in particular, when we reach the integrated applications stage. Regardless of how the infrastructure is constructed, the technical topics which need to be addressed are the same: communication through gatewa-vs and firewalls; naming and discovery ofpeers and resources when DNS is not enough; availability and persistence of resources in spite of intermittent connectivity and dvnamic presence; security in a distrusgul environment and locally managed systems: and, management of distributed resources in a heterogeneous setting. There are a number of interesting ways in which people have applied P2P technologies. We give an example in each ofthe three application categories. The.fina1 segment of the talk summarizes the challenges that need to be overcome f P 2 P is to be widely adopted. The major technical challenges are direct communication, security, naming and interoperability. There are also social and cultural barriers. These are the result of decentralization, and loss of direct control over resources. They also have to do with trust, reputation, and * Other names and brands may be claimed as the property of others.

Lecture Notes in Electrical Engineering, 2012

File sharing is the practice of distributing or providing access to digitally stored information. The advantages of the existing file sharing repositories are limited by the factors of the cost and usage of multiple repositories for different purposes. This paper presents the development of an intelligent webenabled facilitation system called Smart Desk which provides a single file sharing interface to the users, with the capability of virtually unlimited space. Smart Desk uses the services of other repositories by storing the data on other networks, and thus providing virtually unlimited space to the users for storing data. The drag & drop based single interface allows the users to easily view, edit, delete, upload, and copy data. A usability study has been performed to evaluate the efficacy of the system. The evaluation shows that Smart Desk is a useful interface for sharing files which is time effective and user friendly.

Proceedings of the 2nd ACM SIGCOMM workshop on Home networks - HomeNets '11, 2011

Devices forming a Home Network have different capabilities and interfaces, discouraging users to organize their large digital content libraries. To help users, we propose to organize the Home Network according to a gateway-centric architecture, where the content access unification is realized at the file system level and where no additional software installation on devices is required. Solutions for realizing this unification individually exist for the various devices making up the Home Network (UPnP/DLNA devices, personal computers, cloud storage systems, etc). Unifying the content access at the file system level offers a powerful lever for many legacy applications, as far as these applications can access all shared data in the Home Network. Users can thus continue to use their PC's file manager or favorite media player to browse or display shared content. An indexing application, running on the gateway, possibly managed by the ISP and accessible from any device via a simple web interface, enables more powerful content retrieval and user experience. Such application may be enriched to offer additional services like content format adaptation, duplication detection or automatic backup. Lastly we describe how this gateway-centric architecture can be leveraged by cloud applications such as distributed storage systems.

2001

Personal computing and communication devices such as computers, personal digital assistants (PDAs), and mobile phones are moving to their next generation in which the end user will be able to access a multitude of information with a single device either locally or through a network. One likely trend in future personal computing and personal communication is that there will not be a single but several equivalent devices available to users allowing access to information in various forms.

1994

This paper proposes the use of a wide-area file system for storing and retrieving documents.We demonstrate that most of the functionality of the World-Wide Web (WWW)information service can be provided by storing documents in AFS. The approach addressesseveral performance problems experienced by WWW servers and clients, suchas increased server and network load, network latency and inadequate security. In addition,the mechanism

Transmission media are the physical pathways (guided or unguided) that connect computers, other devices, and people on a network. Computers and telecommunication devices use signals to represent data. These signals are transmitted from a device to another in the form of electromagnetic energy. Examples of Electromagnetic energy include power, radio waves, infrared light, visible light, ultraviolet light, and X and gamma rays. All these electromagnetic signals constitute the electromagnetic spectrum. Each portion of the spectrum requires a particular or unique transmission media for the transfer of data such we call as Twisted Pair, Coaxial cable, Optical fibber, Satellite, and Wireless etc.

Wireless technology provides us many benefits like portability and flexibility, increased productivity, and lower installation costs. Wi-Fi networks can be accessed with laptops, mobile phones, cameras, game consoles, and an increasing number of other consumer electronic devices. Wireless technologies have become increasingly popular everyday in business as well as in personal lives. Wireless Networking changed completely the way people communicate and share information by eliminating the boundaries of distance and location

Due to the booming growth of Information and Communication Technology (ICT), a vast amount of data is produced at a considerably high rate and it drives the traditional methods of storing data to its limits and most of the time it simply overwhelms the current storage systems. Because of that throughout the history of the development of ICT, the effort to find an efficient and feasible data storage system that has a substantial capacity to cater the current data storage needs has been relentless.Currently available shared storage devices are mostly file servers and Peer-to-Peer systems which are organized in various different architectures but there are certain areas that pose problems in implementing such systems at small scale and also at enterprise level. Networked Shared Storage System(NSS) is introduced as a system motivated by that historical desire to achieve the ultimate reliable and secure storage media and it represents the way ahead in discovering the ultimate solution for this long lasting problem. NSS is a Local Area Network (LAN) based, secure and reliable distributed storage system. Its primary objective is to use the free local hard disk space available in the workstations connected to a LAN, as its storage media. This is achieved by the radical but fail proof method of breaking down the single file in to a set of data chunks and distributing them throughout the LAN. These chunks are then remerged to reproduce the original file at the users’ request. Through this method the largely the unutilized free disk space of nodes connected to the LAN is used to create a free disk space pool that will serve the storage needs of the users of that same network, rather than incorporating separate data servers for that. A LAN based storage system is invariably challenged by the inherent unavailability of the nodes of a LAN. But the NSS overcomes this problem via a robust and efficient data replication algorithm that makes replicas of the data chunks when storing them. Thus providing a high percentage of availability/reliability for the stored data.Peer-to-Peer communication is used when distributing the chunked data throughout the network via the embedded FTP servers. This architecture will minimize the security issues and protect the privacy of data which is greatly challenged in a LAN based environment. NSS is highly scalable and applicable for both medium scale LAN and its enterprise level equivalent, with no additional modification to the architecture and with lesser cost and effort than most existing solutions (Cloud Servers and Server Farms). Thus making it the way ahead in achieving the ultimate storage m

The Journal of Instruction Delivery Systems, 1993

Large, decentralized organizations can dramatically increase the use and benefits of multimedia by distributing multi-media communications, information and training over Local Area Networks (LANs)and Wide Area Networks (WANs). This approach empowers employees at remote locations to access the information/training that they need, when they need it, directly at their desktop. This article will show that network delivery of multimedia is an area that has tremendous growth potential; provides examples of practical applications for multimedia delivery over local and wide area networks; and addresses some of the technical issues that must be considered to successfully deliver multimedia over networks.

Computer Networks and ISDN Systems, 1998