Many intruders already know this. They'll drive through neighborhoods searching for stray signals with radio equipment. With the right information, they could access your networked computers and files. They could even borrow your Internet connection.
Hackers search for people who use the default factory settings. Those settings usually include low or no security. You can start protecting your network by reconfiguring your wireless router.
But most folks don't even know how to change the router's configuration. I'm going to put you on the right track. The descriptions that follow are general, because different brands require different steps.
Finding your router's settings
Most wireless routers are configured through a browser such as Internet Explorer. First, you need to connect your wireless router to a computer. Yes, you're already connected through your network. You can otherwise connect directly with an Ethernet cable. Ethernet cables look like telephone cords with large-sized plugs.