| This piece of equipment is called a modem. Once this modem connection is established, your ISP will want to make sure that you have a user account (he does not want to provide internet access to people without an account). To use TCP/IP, the standard internet protocol suite, you'll also need an IP address for your machine, IP addresses of the nameservers that will translate URL's in server IP addresses, etc. Most of this information is no longer fixed (so you could keep it in a configuration text file on your computer), but is assigned dynamically, while you set up the connection with your ISP. So the PPP protocol will have to take care of authentication of the user and configuration of the machine that wants to connect to the internet. This is how that works : The modem dials out to your ISP's number, a modem on the other side replies, they wistle to each other to agree on a transmission speed, then start exchanging packets.
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