What Is a WAN? Wide-Area Network - Cisco
www.cisco.com › c › enWide-Area Network. In its simplest form, a wide-area network (WAN) is a collection of local-area networks (LANs) or other networks that communicate with one another. A WAN is essentially a network of networks, with the Internet the world's largest WAN. Today, there are several types of WANs, built for a variety of use cases that touch virtually ...