Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide

Private WANs to Connect Enterprises

WAN services usually create either a private WAN service or a public WAN service. With a private service, one customer connects to the WAN service provider with connections from many sites. The provider promises to forward data between those sites. Later, when a second customer connects to that same WAN service, the WAN service keeps the two customer’s data traffic private. While the data may flow through the same devices inside the provider’s network, the provider never forwards data sent by customer 1 to customer 2, and vice versa, making the network private from the customer perspective.

In contrast, a connection to the Internet relies on the fact that each Internet service provider’s (ISP) customer can ...