OK - sorry if this is elementary - however I am dealing with a challenge to the security of some ATM links that we have connecting remote facilities to a main campus. The connections are all PVPs with individual PVCs defined point to point. The concern that is being raised is that although these connections appear point-to-point PVCs to the router interfaces at our sites and our main campus - they are more than likely switched SVCs on the provider backbone... I had thought that a PVC was a nailed up connection between vpi-vci pairs throughout the provider ATM network - is that an incorrect assumption? And if so is the scenario that was raised possible/probable and a concern? Thanks for any info kids... -- Rich Sena - ras@thick.net ThickNET Consulting "On the way to understanding; you understand, and forget."