Many small business networks rely on their ISPs for DNS (Domain Name System) service, which lets you access websites and other Internet resources with friendly names like rather than obscure, numbers-only IP addresses. Switching to a third-party DNS service such as OpenDNS tends to provide faster browsing performance, and it enhances security by blocking access to sites that may be infected with malware. (Note: GFI Software recently discontinued its ClearCloud DNS service, and Google’s Public DNS service doesn’t currently offer any malware protection.)