review EIGRP: http://en.wikipedia.org/wiki/EIGRP

IP protocol # 89 for OSPF, #520 for RIP
OSPF packet types: hello, DBD, LSR, LSU, LSAck

OSPF all routers: 224.0.0.5
OSPF DR: 224.0.0.6

LSA types: 1, 2, 3, 4, 5, 7 (CCNP scope)

OSPF router ID is determined in the following order:
1. assigned by router-id command
2. highest loopback interface IP address
3. active highest physical interface IP address

Hello interval: 10 seconds for multiaccess and point-to-point, 40 seconds for NBMA (Frame Relay, X.25, ATM)
dead interval: 30, 120

1. DR: Router with the highest OSPF interface priority.
2. BDR: Router with the second highest OSPF interface priority. 
3. If OSPF interface priorities are equal, the highest router ID is used to break the tie.

ip ospf pri
ip ospf cost
ip ospf network (beyond scope)
sh ip ospf int
sh ip ospf nei
sh ip ospf data