Introduction
Metropolitan area networks (MANs)
- Span from 3 to 30 miles and connect backbone networks (BNs) and LANs
Wide area networks (WANs)
- Connect BNs and MANs across longer distances, often hundreds of miles or more
Typically built by using leased circuits from common carriers such as AT&T
- Most organizations cannot afford to build their own MANs and WANs,