ABSTRACT
Of course, with more choices comes more confusion. Not only will companies need to select between L2 and L3 VPNs, they'll likely have to choose between two types of L2 VPNs. To get ready for the CEO's and CTO's inevitable purchasing questions, start by defining VPNs
LAYER-2 VPNS 601
for them: a closed user group where admittance is based on an address, such as the Ethernet or frame address for L2 VPNs, and the IP address for L3 VPNs. Then explain the differences between L2 and L3 VPN s, as well as the differences between L2 VPN approaches.
