ATM and VPN's

Help me out- What's the point of a VPN over ATM?  If you establish a PVC
that's the same thing, isn't it?

My understanding is that VPN's came about due to the insecurity of IP; ATM
doesn't have these weaknesses so again, what's the point of a VPN over ATM?

I can see a VPN through an IP LAN that connects to an ATM WAN and then back
to an IP LAN; however, that's different than creating a VPN over ATM.

Eric Jeffery, MCSE
Network Systems Analyst

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