Hi Lee,
I don’t have a rhyme but there’s some logic to these OSPF network types:
Only broadcast and non-broadcast require a DR/BDR election since OSPF sees these network types as “multi-access”. Everything with “point” in it is seen as a collection of point-to-point links so there is no DR/BDR election.
Everything with “non-broadcast” requires you to configure neighbors since OSPF won’t be able to find them by itself.
Only with point-to-point we use a subnet for each PVC, all other OSPF network types usually have a single IP subnet.
Still some memorization to do but if you understand the logic, it will be easier to remember
Configuring DLCIs doesn’t have anything to do with OSPF or its network types but when you configure frame-relay, you always need DLCIs…maybe you get one from the frame-relay switch or you have to do it yourself.
Rene