What is a network access point?
First formed in 1994, network access points are interconnection locations for networks. Network access points (NAPs) were part of the new architecture that was adopted due to the increase in the number of users and the increasingly commercial nature of the traffic running over the NSFnet backbones. An interesting point is that even though these interconnections "route" traffic between networks, they have no routers. NAPs live at layer 2. This works because all of the networks attaching to the NAP have edge routers running Border Gateway Protocol (BGP). In this way the various backbones share their routing tables.
Ameritech - Chicago
Last known location (8-15-01): GO
Sprint - New Jersey
Last known location (8-15-01): GO
MAE - Washington D.C.
Last known location (8-15-01): GO
PacBell - San Francisco
Last known location (8-15-01): GO