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Probably the main reason most small business and home networks exist is to allow everyone to access the Internet through a single shared Internet connection. In Figure 1-1, you can see that the wireless router is connected to the Internet. By sharing this connection, all the computers on the network, whether wireless or via cables, can access the Internet through the wireless router.

It’s important to note that nearly all wireless routers also contain a built-in firewall. The firewall helps protect the computers on the network from the imminent dangers of the Internet. The moment you connect a home or office network to the Internet, cybercriminals will begin trying to break into your network and try to trick you into divulging sensitive information, such as the password to your bank account.

Never — and I mean never — allow any computer to connect directly to the Internet without a firewall in place.