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	Topic: WEB DEVELOPMENT Web Development as opposed to Web Design is the process of creating websites with functionality above and beyond displaying static content. While Web Design is concerned with the layout, look, feel and aesthetics of a website, Web Development is concerned with how the content is delivered, where it is stored, who can edit it, and what viewers can do with it. What you can learn here The following topics have been ordered to help provide a pathway for you to learn the main skills of web development. Optional Prerequisites Install a Web Server - If you are going to have a web site you have to have a way to serve the pages. This lesson shows you how to get a basic web server running. Getting Started Web Design/Getting Your Site On the Web - So you've got your site, now you need to get it on the web for everyone to see! Select and Install a Content Management System - Do you want to upload your HTML files to your site every time you make a change or do you want to edit your site through the site itself? Do you want to have users and security? Do you need extra functionality? A Content Management System sets the stage for your website. Using the Right Tools - See a growing list of selecting the right tools for the job! Web Development Web Application Frameworks - Before we start extending the web, lets look at how it works. Security - "Security is hard." Jim Fulton, chief Zope architect. Web Languages - ASP.Net, Java, PHP, Python, Ruby. All you need is one language to create the next greatest thing. Now, which one.... Data Persistence - In addition to having the programming skills, you also need to do something with all that data. How and where you store it can have a significant impact on your system. Web Applications E-Commerce Data-entry/Workflow Subscription Services HARDWARE: Topologies bus All nodes are connected to a single wire or cable (the bus) which has two endpoints. Each communications device on the network transmits electronic messages to other devices. If some of those messages collide, the sending device will wait and then try to transmit again. The advantage of bus network is that it is can be organized as a peer-to-peer network or client/server network. It is also relatively inexpensive to install. The disadvantage is that if the bus network fails, the whole system network fails. The wider the bus the better! ring The ring network is a network in which all communications devices and microprocessors are connected in a continuous loop. Electronic messages pass around the ring until they reach the correct destination; there is no central server. The advantage of a ring network is that messages only flow in one direction. The disadvantage is that if a single connection is broken, the whole network stops working. The distributed star or tree topology can provide many of the advantages of the bus and the star topologies. It connects workstations to a central point, called a hub. This hub can support several workstations or hubs which, in turn, can support other workstations. Distributed star topologies can be easily adapted to the physical arrangement of the facility site. (Integrated Publishing) star A network that links all microcomputer and other communication devices through a central server. The advantages of this hub is that it prevents impact between messages. The network forms a star shape having the central server in the middle with a single branch outward, the branch will not branch to another device. Other Advantages Include: * Good performance. * Scalable, Easy to set up and to expand. * Any non-centralised failure will have very little effect on the network, whereas on a ring network it would all fail with one fault. * Easy to detect faults * Data Packets are sent quickly as they do not have to travel through any unnecessary nodes. * It is used for centralised control.