Understanding the WAN
A Wide Area Network (WAN) connects multiple Local Area Networks (LANs) across large distances. While a LAN links devices within one site, a WAN connects branch offices and data centers through service provider infrastructure. WANs let organizations share data and applications across cities or countries.
Traditional WAN Connections
Before modern fiber and VPN technologies, companies used leased lines, ISDN, and Frame Relay to connect sites. These older methods were slower, costly, and less scalable. Knowing them helps you understand how WANs evolved into today’s high-speed solutions.
Why WANs Matter
WANs bridge local networks to the global Internet, enabling secure long-distance communication. Mastering WAN fundamentals prepares you for modern technologies like MPLS, Ethernet WAN, and VPNs that power enterprise connectivity today.