Client/Server Architecture and Attributes
The client/server software architecture is a versatile, message-based and modular infrastructure that is intended to improve usability, flexibility, interoperability, and scalability as compared to centralized, mainframe, time sharing computing. A client is defined as a requester of services and a server is defined as the provider of services. A single machine can be both a client and a server depending on the software configuration. This technology description provides some common client/server architectures and attributes.
The original PC networks were based on a file sharing architecture, where the server downloads files from the shared location to the desktop environment. The requested user job is then run (including logic and data) in the desktop environment. File sharing architectures work if shared usage is low, update contention is low, and the volume of data to be transferred is low. In the 1990s, PC LAN (local area network) computing changed because the capacity of the file sharing was strained as the number of online user grew (it can only satisfy about 12 users simultaneously) and graphical user interfaces (GUIs) became popular (making mainframe and terminal displays appear out of date). PCs are now being used in client/server architectures.
As a result of the limitations of file sharing architectures, the client/server architecture emerged. This approach introduced a database server to replace the file server. Using a relational database management system (DBMS), user queries could be answered directly. The client/server architecture reduced network traffic by providing a query response rather than total file transfer. It improves multi-user updating through a GUI front end to a shared database. In client/server architectures, Remote Procedure Call (RPC’s) or standard query language (SQL) statements are typically used to communicate between the client and server. The following descriptions provide examples of client/server architectures.
A unique structure is a two-tier architecture. With two tier client/server architectures the user system interface is usually located in the user's desktop environment and the database management services are usually in a server that is a more powerful machine that services many clients. Processing management is split between the user system interface environment and the database management server environment. The database management server provides stored procedures and triggers. There are a number of software vendors that provide tools to simplify development of applications for the two-tier client/server architecture. The two-tier client/server architecture is a good solution for distributed computing when work groups are defined as a dozen to 100 people interacting on a LAN simultaneously.
Basically, a Browser/Server (B/S) model is adopted in the system design where nearly all computing load is located on the server side, while the client side is only responsible for displaying. In this project, SOA is used to facilitate data communication and interactive operations for the reason that each web service is an independent unit in SOA. The general structure of the web-based UMS using SOA is described as follows (Figure 2). In Figure 2, the server side is composed of GIS web service providers, an image cache server, a web server and a firewall.
As far as network traffic is concerned, the traffic used by a thin client is significantly lower than that of a PC since the workspace is on a centralized server and the traffic to the terminal is strictly input and output. The majority of the data traffic is from server to server, as in this case from the terminal server to th...
In order to ensure that the most appropriate and detailed evaluation of these platforms are analyzed and presented so that their feasibility can be determined either for a comprehensive rollout, or for specific requirements that have been identified. Three specific vendors have been identified, all of whom have a vast experience with the implementation of Linux solutions and can also be defined as some of the leading names within the market. Each of these vendors offerings in both a Server and Workstation configuration will be appraised in order to determine the most efficient and effective solution which could be implemented.
...to 300 Mb (Osiris, 1). WORKS CITED Benson, Alex. Client/Server Architecture. Gainesville: U P of Florida, 1992. Comelford, Richard. "Operating Systems go Head to Head", IEEE Spectrum. Dec 1993, pp 23-25. Flynn, Ida M., and Ann M. McHoes. Understanding Operating Systems. Second ed. Boston: PWS, 1997. Greenfield, Larry. UNIX: The User's Guide. University of Deuselldorf. [Accessed 3 September 1998]. *http://www. Theochem.uni-duesseldorf.de/docu/user-guide* Introduction to UNIX. University of Guadalajara. [Accessed 3 September 1998]. http://osiris.staff.udg.mx/man/ingles/introduccion.html " Microsoft Corporation" Brittanica Online [Accessed 20 September 1998]. *http://www.eb.com:180/cgi-bin/g?DocF=micro/711/22.html* Operating Systems Introduction, v 3.2. Central Institute of Technology. [Accessed 5 September 1998]. *http://www.cit.ac.nz/smac/os100/unix01.html* Randall,
This paper was written to show the similarities and differences in five different databases. It compared Access, MySQL, SQL Server, DB2, and Oracle in six different areas. It found many similarities in functionality, but large diversity in pricing.
In most cases today, a distributed computing architecture consists of very lightweight software agents installed on a number of client systems, and one or more dedicated distributed computing management servers. There may also be requesting clients with software that allows them to submit jobs along with lists of their required resources. An agent running on a processing client detects when the system is idle, notifies the management server that the system is available for processing, and usually requests an application package.
Setting up the network basis is necessary to the success of this project. A Client/Server network is needed to implement through a TCP/IP protocol. Each plant will function as Local Area Network linked together as a Wide Area Network. All the users with the access will have the ability to exchange information instantly. This configuration will generate the best and secured settings to create and direct the information to the users.
In contrast to the poorly defined Windows DNA (Distributed interNet Architecture), .NET is a tangible and easily defined software product. It is an application framework, meaning that it provides applications with the system and network services they require. The .NET services range from displaying graphical user interfaces to communicating with other servers and applications in the enterprise. It replaces Windows COM (Component Object Model) with a much simpler object model that is implemented consistently across programming languages. This makes sharing data among applications, even via the Internet, easy and transparent. .NET also substantially improves application scalability and reliability, with portability being a stated but not yet realized objective. These are clear benefits demonstrated by the pre-beta edition of .NET.
In the early years of computer and network research and development many systems were designed by a number of companies. Although each system had its rights and were sold across the world, it became apparent as network usage grew, that it was difficult, to enable all of these systems to communicate with each other.
Peer-to-peer is a communications model in which each party has the same capabilities and either party can initiate a communication session. Other models with which it might be contrasted include the client/server model and the master/slave model. In some cases, peer-to-peer communications is implemented by giving each communication node both server and client capabilities. In recent usage, peer-to-peer has come to describe applications in which users can use the Internet to exchange files with each other directly or through a mediating server.
When designing networked applications one key protocol stands out as the foundation for making it possible. That protocol is TCP/IP. There are many protocols out there that allow two applications to communicate. What makes TCP/IP a nice protocol is that it allows applications on two physically separate computers to talk. What makes TCP/IP great is that it can do with two computers across a room or across the world. In this paper I will show you how TCP/IP allows a wide array of computer hardware to work together without ever having to knowing what the other machine is or how it even works. At the same time you will learn how it allows information to find its way around the world in a faction of a second without knowing in advance how to get there.
Thin Client or Server-based computing is a model in which applications are deployed, managed, supported and executed 100% on a server. It uses a multi-user operating system and a method for distributing the presentation of an application's interface to a client device. The server-based computing model employs three critical components. The first is a multi-user operating system that enables multiple concurrent users to log on and run applications in separate, protected sessions on a single server. The second is a highly efficient computing technology that separates the application's logic from its user interface, so only keystrokes, mouse clicks and screen updates travel the network. As a result, application performance is bandwidth-independent.
Distributed systems are grouping of computers linked through a network that uses software to coordinate their resources to complete a given task. The majority of computer systems in use today are distributed systems. There are limited uses for a singular software application running on an unconnected individual hardware device. A perfect distributed system would appear to be a single unit. However, this ideal system is not practical in real world application due to many environmental components. There are many attributes to consider when designing and implementing distributed systems. Distributed Software Engineering is the implementation of all aspects of software production in the creation of a distributed
Local Area Networks also called LANs have been a major player in industrialization of computers. In the past 20 or so years the worlds industry has be invaded with new computer technology. It has made such an impact on the way we do business that it has become essential with an ever-growing need for improvement. LANs give an employer the ability to share information between computers with a simple relatively inexpensive system of network cards and software. It also lets the user or users share hardware such as Printers and scanners. The speed of access between the computers is lighting fast because the data has a short distance to cover. In most cases a LAN only occupies one or a group of buildings located next to each other. For larger area need there are several other types of networks such as the Internet.
A network can be based on either a peer-to-peer level or server-based, also referred to as domain-based. To distinguish the difference, a peer-to-peer network, also known as a workgroup, is a network in which a group of computers are connected together to share resources, such as files, applications, or peripherals. The computers in a peer-to-peer network are peers to one another, meaning no single computer has control over one another. There is also no central location for users to access resources, which means that each individual computer must share their files in order for other computers to have access (Muller, 2003, p.411). “In a peer-to-peer environment, access rights are governed by setting sharing permissions on individual machines.” (Cope, 2002) On the other hand, in a domain-based network, the computers connected together are either servers or clients. All of the other computers connected to the network are called client computers. The server is a dedicated machine that acts as a central location for users to share and access resources. The server controls the level of authority each user has to the shared resources. When logging on to the network, users on client machines are authenticated by the server, based on a user name and password (Lowe, 2004, p.13).