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It's global question, many things will be effect in enterprise network design special traffic management and concurrent users in each branch.
Flex VPN is a new framework to configure IPsec VPN with IKE version 2 (IKEv2) on IOS platforms.
Dynamic Multipoint VPN (DMVPN) is a Cisco IOS Software solution for building scalable IPsec Virtual Private Networks (VPNs).
Cisco offers three major routers types:
1. ISR: (integrated Service Routers): typically used as internet edge for customers with small/medium networks.
2. ASR (Aggregation Services Routers): typically used as internet edge for enterprise networks and service providers.
3. CSR (Carrier Routing System): typically used in (IP/MPLS) core networks and for high-speed peering in smaller point-of-presence (POP) locations.
ASR is best choose but cost will be so important .
ASR routers are best suited for core network and ISR for boundary sites
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