Why should you be concerned about bridging? Initially, when these non-routable
(for example, LAT or SNA) protocols were invented, they were only intended for
use on local area networks (LANs). In today’s networks, these non-routable protocols
are used between remote locations. Because these locations can only be reached
via a wide area network (WAN), non-routable protocols need to be bridged across
the wide area networks. Bridged protocols are typically broadcast intensive and can
cause a WAN link to reach high levels of utilization, resulting in slow response
times or protocol timeouts, which will affect the entire WAN to some degree....