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  Dynamic Multipoint Virtual Networks (DMVPN) DMVPN is a Hub-and-Spoke topology and the main tool to create VPNs is combination of mGRE . The registration process can be conducted via Static or Dynamic. click here for all the theories about DMVPN and MPLS. 1.  Introduction of MPLS 2. What is MPLS Label distributing protocol (LDP) ? How LDP works? 3. how to configure MPLS LDP Peering ? 4. What is MPLS L3 VPN ? How to configure? 5. How to configure MPLS L3 VPN with RIPv2 ? 6. How to configure MPLS L3 VPN with EIGRP ? 7. How to configure MPLS L3 VPN with OSPF ? 8. What is OSPF Sham Links? how to configure OSPF Sham Links? 9. How to configure MPLS L3 with BGP AS OVERRIDE? 10. What Is Network Tunneling And How To Configure Generic Routing Encapsulation (GRE) Tunnels? 11.  What Is DMVPN (Dynamic Multipoint VPN), NHRP, MGRE And How To Configure DMVPN Phase 1? 12.  What Is DMVPN (Dynamic Multipoint VPN) Phase 2? How To Configure DMVPN Phase 2 Dynamic And Static Mapping? ...

Frame relay is one of the WAN protocols you need to understand if you plan to become CCNA-certified. It’s also one of the most difficult protocols to understand for most CCNA students. Frame-Relay was a very popular WAN technology in the past days. It still is today to some extent. However, it is safe to say that it is being replaced by competing technologies like Ethernet WAN, Multi-Protocol Label Switching (MPLS), and Virtual Private Network (VPN). Frame relay uses a service provider to provide connectivity. Frame relay is cost cost-effective solution for leased lines. A virtual circuit  is a connection in a frame relay is provides virtual circuits.  Multiple logical connections on the same physical connection. Data link connection identifier (DLCI)  identifies the virtual circuits range (16- 1007) given by the service provider. Local DLCI map with a remote IP address.  Manual or auto-mapping (inverse ARP).  local management interf...