Many libraries are or soon will be offering Wi-Fi, also known as wireless networks. The largest perceived barriers to providing this service are concerns about security. The prime rule when deploying Wi-Fi is segregation, having a clear separation between a public wireless network and the rest of the library?s network. A number of devices can be used to achieve proper separation. While a firewall tends to be the most common approach, the VLAN (Virtual Local Area Network) capabilities available on enterprise-level Ethernet switches achieve even better results. With good network segregation, no matter what maliciousness breaks out on the wireless part of the network, the staff side remains secure.