1. Are all OSPF Routers suppsed to see networks in All OSPF areas? 2. Should all loopbacks be configured in the same area?

172.128.0.0 /26 My material says this network has 1024 total subnets and 62 hosts per subnet. 172.128.0.0 172.128.64.0172.128.128.0172.128.192.0  These are the only "subnets" I see and understand. Where are the other 1020 coming from?     

In OSPF, is there a single designated router for a given network OR is there a designated router for each SECTION of a network?  

I have 7 Routers. All the interfaces of each Router are running OSPF except one interface. One of the interfaces on Router7 I configured for EIGRP. I CANNOT ping that EIGRP interface though. Should I be able to?        

I got 7 routers each with a loopback. I also have 3 OSPF Areas...0, 1, and 2 Routers 2 and 3 have interfaces in both Area 0 and Area 1 Routers 4 and 5 are only in Area 1 Routers 6 and 7 are only in Area 2 Router1 - 1.1.1.1 /32 loopback 0Router2 - 2.2...