Routers offer two common forms of security: WEP, and Wi-Fi Protected Access (WPA) encryption. Both are easy to enable, although you'll get maximum protection from WPA. To activate security, go to your router's browser-based administration tool (the default address for most routers is http://192.168.0.1 or http://192.168.1.1) and look for the wireless-security area. WPA requires you to enter a simple security phrase (eight to 63 characters), or, with some routers, a more secure (but much harder to remember) 64-digit key. Similarly, WEP demands that you choose from 64-bit or 128-bit encryption, and enter an alphanumeric hex phrase,.
In addition to enabling wireless security, you can also disable the broadcasting of the Service Set Identifier (SSID, or network name). Doing so can make the network more difficult for hackers to see. Also, make sure to enable the router's hardware firewall (more on that later), and change the router's default password. And never enable file sharing, unless you really use it.
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