1. Protocol
   1. Distance Vector
   2. Hybrid Routing
2. Information Exchange Methods
   1. Multicast
      1. 224.0.0.10
   2. Unicast
3. Multiple Network Protocols
4. 100% Loop Free
5. Does not use Broadcast packets
6. Packet Contents
   1. Frame Header
   2. IP Header
   3. Protocol 88
      1. Payload
      2. EIGRP Protocol #
7. Total Path to Destination = Feasible Distance
8. Distance to Destination = Advertised Distance
9. Metrics
   1. Bandwidth (K1)
   2. Load (K2)
   3. Delay (K3)
   4. Reliability (K4)
   5. MTU (K5)
10. Tables
    1. Neighbor
    2. Topology
    3. Routing
11. Best Path
    1. Goes into routing table
    2. Successor Route
12. Best Backup Path
    1. Feasible Successor
       1. Advertised Distance of Feasible Successor must be < Feasible Distance of Successor Route
13. Unequal Load Balancing
    1. Shares traffic proportionally
    2. Use "variance" command in Cisco CLI
    3. Feasible Successor must have a lower Feasible Distance than the Successor X multiplier
14. Uses RTP (Reliable Transport Protocol)
    1. RTP for EIGRP packets
15. Uses Multicast on Multi-Access Network (ethernet)
    1. To Send EIGRP packets
16. Uses Holddown Timer
    1. Instead of sending ACK to Hello packets
17. Types of EIGRP Packets
    1. HELLO
    2. UPDATE
    3. QUERY
    4. REPLY
    5. ACK