Computers and other devices on a network can be connected via cables or one of the newer technologies that utilize the building's phone or power lines. Most small business LANs are based on dedicated network cable and Ethernet technology. Switches are a higher-performance alternative to hubs. Of note, a fast business connection to an ISP may also be utilized as a portal for other business services. For example, Voice-Over IP technology can link PBX telephone systems with voice trunk lines via the Internet.
Voice quality is reduced but the long-distance cost savings can be huge.
A VPN is a private communications channel on the Internet that provides security through user authentication and encryption. In choosing a network design consultant, ask about the training and credentials of the people you'll be working with and ask for references from other small business. Also get recommendations from other businesses like yours, vendors, customers and local industry associations and business groups. Ethernet switches cost more than Ethernet hubs. Quality and comprehensiveness of design services and quality of hardware selected influence total cost.