'''Media:'''A brief explanation how websites are located using the DNS
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'''Exercise: Change your computer's DNS settings ''' (Here is a walkthrough regarding changing DNS settings in Windows 7)
1. Use the http://hostip.info tool to find out the IP addresses of your favourite websites.
3. Manually set the DNS servers to OpenDNS addresses (208.67.222.222208.67.220.220) or use two of the root DNS servers (http://en.wikipedia.org/wiki/Root_name_server ).
===Interact===
The last part of the Internet's infrastructure concerns the applications we use to send and receive content on the Internet. These include your browser, email program, chat client and every other software on your computer that utilises or help you interact on the Internet. Every application has its particular language and protocols and these often affect how information is transmitted between two computers on the Internet. This usually involves a type of technical language (protocol) by which it communicates or the channel (port) it selects for communication. For example, some applications send data in a clear-text format and every computer/router that stands in-between the communicating parties can access and understand the transmitted information. Other applications take special care to ensure privacy for the communicating parties. For example, when you connect to http://google.com your browser is using the 'http' protocol on port 80. However when the website's address is preceded by the letters 'https' (https://mail.google.com) your browser begins to use the Secure Sockets Layer (SSL) protocol on port 443. The majority of this course is explaining and exploring the different ways that applications interact on the Internet, directly impacting upon your privacy, anonymity and authentication of the transmitted message.
'''Media: ''' Here's a video tutorial from some kid in his bedroom, pulling all the topics that we have discussed above, together.
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