Router will allow you connect multiple computers to one internet connection.
Yes, if you have 4 computers on your network, it would benefit you to have a web server. The web server would allow you to have faster internet access and speed.
Your computer must have a network to access if you are going be able to get on the Internet. Internet Service Providers can set you up with an account that will allow you to login at 'hotspots's, such as the coffee shop. IF you want to have access at home, you will have to set up an internet account, and then buy a wireless modem or router to allow you to connect to the internet.
Yes.Added: If the school is supplying the internet access, it is their right to control access to it by those choosing to use it.
Both A and B
Yes. AT&T offers services that allow the iPhone to access the Internet wherever there is a cellular data signal. Or, the iPhone can connect to a WiFi network to access the Internet without the need of an AT&T plan.
Prepaid internet services that allow a preset number of minutes of internet access for a fixed price are most cost effective for internet users who want access to the internet for short periods of time.
address translation
Address Translation.
netbook
3G services for a computer allow for faster downloading and data transfers. 3G services for a cell phone allow for better audio and video quality and faster data transfers. They also allow for the internet to be faster on your cell phone.
To access the internet from anywhere on your laptop, you can use a mobile hotspot, connect to public Wi-Fi networks, or use a cellular data plan. These options allow you to stay connected to the internet no matter where you are.