This data takes the form of network 'packets' that are wrapped up using an addressing protocol called TCP/IP. The modem takes the analogue electrical signal from the phone line and extracts the digital data stream encoded within it. At the phone socket, you plug in a filter that splits the frequency range, so that the lower 4KHz is used by voice phone calls and the rest is sent to the modem. If you have ADSL broadband – the most common kind – it's delivered to your house through the phone line. This, plus your Mac, is the simplest network you can have, and for lots of people it's all the network they need. When you get broadband, your internet service provider (ISP) normally supplies you with a broadband modem. But armed with the next few pages, you'll be able to roll for cover and return fire. Home networking is a rough neighbourhood and you're always going to get shot at. Long after death and taxes have both been abolished, network problems will remain. Despite all this, your network may still sometimes break.
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