The WAN module in the medium-sized network blueprint is included only when connections to re-mote locations are desired or needed over a private network and QoS requirements cannot be met through the use of IPSec VPNs. Another factor in determining whether a WAN module is needed is the cost of migrating to IPSec VPNs when existing legacy WAN connections exist. The key device in the WAN module is the router, which provides connectivity to the remote locations.