Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] WANs (wide-area networks) DMVPN IP services Layer 2 circuits 2nd mGRE multicast P2P GRE scalable enterprise network design aggregation routers branch-end routers dedicating routers at network core dual-circuit resiliency hierarchical architecture IP service with VPN overlay routing adjacencies IPSec/GRE ISDN backup resiliency multilayer switches point-to-cloud IP service routing adjacencies point-to-point service routing private point-to-cloud connectivity private point-to-point connectivity security spoke-to-spoke connectivity tunnel overlay resiliency virtualization segmentation VN extensions contracting multiple IP VPN CsC MPLS over GRE MPLS over Layer 2 circuits RFC 2547 VPN over DMVPN RFC 2547 VPN over L2TPv3tunnels VRF interconnected by GRE or DMVPN overlay VPN QoS models Web clients, Layer 3 clientless authentication wireless access |