Press n to go through all the elements in the 'n'etwork. Press m to show how a 'm'ail travels from the home to a mobile. Press p to show how a 'p'icture is divided in packets and how the packets can travel through different paths to be reassemble later in the mobile. Press e to 'e'xplain more about the packets. Press space in all modes to continue with the animation. Here is a small explanation to all the animations: Network: - House: About how it is connected in the house, with cables and wifi and then it goes out via an internet cable under the ground. - Then we connect to an internet provider such as Comhem, Breadbansbolaget, etc. - And we want to reach information that is stored in servers. We want to reach information such as facebook, youtube, etc. - The servers and the internet providers are connected via internet exchanges, so we have the city connected with cables under ground and even under water. - The internet exchanges are connected all over the world. - Then we go to the mobile network and the door between internet and the mobile network is the Packet Gateway which among other things checks if the content is allowed and charges the mobile. - Then traffic goes to the Mobility Manager which needs to find the mobile among all the antenas. - Then we show the cells and how the cover smaller areas in the city and larger in the country side, and mention that the antenas are everywhere even if we don't see them. In some remote areas where it is difficult to dig cables it is possible to cover the area with mobile network. - And finaly the traffic reaches the mobile. User case, Mail: - Sending from "jag" with account in yahoo. - Yahoo server sends opens the mail and sends it to google server. - Google server checks that "dig" is logged in and where. - Dig receives the mail via the mobile network. User case, Picture: - We don't send the whole picture, it needs to be chopped in to packets. - Every packets has "origin IP address", "destination IP address". IP address is the address all equipment has. As we do have an address at home so that we can be reached. - The packets don't need to take the same route, and they don't need to arrive in order. The receiver will put them in order and if one packet is missing (as the red packet is), the receiver will ask the sender to send that packet again. - The red packet is send again and now the picture is complete. Some extra explanation: - If parts of the internet are broken there is no a problem because the traffic can take another route. - What we send is light and it can travel 5 times around the world in a second. This is because what we send is light, on or off. - What we send are 0 and 1. Light on or off. And all the machines talk the same language to understand those 0 and 1. The language are called protocols.
