1. EIGRP
2. WAN Connectivity
   1. Packet Switching
      1. Frame Relay
      2. X.5
      3. ATM
   2. Metro Ethernet
   3. MPLS
      1. Layer Two MPLS
      2. Layer 3 MPLS
   4. Direct Connection
   5. VPN
   6. DMVPN
3. OSPF
4. GRE & DMVPN
   1. GRE
      1. Configuration
         1. Create Tunnel Interface
         2. Specify Source interface/IP
         3. Specify destination interface/IP
         4. Specify Tunnel IP address
         5. Run routing protocol
      2. Encapsulates inside IP to Outside IP
      3. Allows Multicast Traffic across the link
      4. NO Encryption
   2. DMVPN
      1. mGRE
      2. NHRP
      3. Routing Protoocol
      4. Configuration
         1. HUB
            1. Create Tunnel Interface
            2. Assign IP address to Tunnel Interface
            3. Specify Source Interface/IP
            4. enable mGRE
            5. specifiy NHRP network-id
            6. set NHRP authentication
            7. map NHRP multicast dynamically
         2. Spokes
            1. Create Tunnel Interface
            2. Assign IP address Tunnel Interface
            3. Specify Source Interface/IP
            4. enable mGRE
            5. NHRP network-id
            6. NHRP authentication
            7. Specify NHRP server (NHS)
            8. map NHS IP to physical interface (NBMA) IP of HUB
            9. map multicast traffice to NBMA IP of HUB
         3. Verification
            1. Show DMVPN
            2. Show ip NHRP