If your Mac is connected wirelessly or, um, wirefully to a cable modem, DSL, or office network, you’re one of the lucky ones. You have a high-speed broadband connection to the Internet that’s always available, always on. You never have to wait to dial.
Most broadband connections require no setup whatsoever. Take a new Mac out of the box, plug in the Ethernet cable to your cable modem—or choose a wireless network from the menulet—and you can begin surfing the Web instantly.
That’s because most cable modems, DSL boxes, and wireless base stations use DHCP. It stands for dynamic host configuration protocol, but what it means is: “We’ll fill in your Network pane of System Preferences ...