Contains the full lesson along with a supporting toolkit, including teachers’ notes.
Cloud computing is very much in the news these days. We keep hearing about it but may not be sure what it means. You may have used your computer to compose a document or to construct a presentation about a project you are doing. To carry out these tasks you needed to access a word processor or presentation application. Word and PowerPoint are two very well-known examples of such applications. These software packages are probably resident on your hard disk and you accessed them by clicking on the appropriate icon. On the other hand, when you use your browser to connect to a website, that website is resident on a server somewhere on the internet and you actually don’t know where. If you think about this, you may come up with a question – why can’t I access a word processor or presentation application on the internet? The answer is that you can, and this is called cloud computing. In this lesson we look at this recent trend and examine some of its features.
What does cloud mean?
The internet is a complex global network with many routers and transmission links. Since the early days of telecommunications it has been standard practice for network engineers not to show all this detail, but to draw the network in the shape of a cloud with the users connected to it. A computer that is accessing a server is called a client.
How is connection made?
Every machine on the internet has a unique identifying number, called an IP Address (Internet Protocol Address). A protocol is a set of rules and IP is the protocol that computers on the internet use to communicate across the internet. You are probably familiar with the format of an IP address - four groups of decimal numbers separated by a decimal point.