As a network engineer in the field working with OSPF you must know the differences in the OSPF network types and which types are compatible with one another. Some types will work with each other but you have to adjust the hello/dead timers. With this...
http://www.ebrahma.com/2013/10/types-of-ospf-network/Labels: Broadcast, DR-/BDR, full-mash, Non-broadcast-Multiaccess-(NBMA), OSPF, OSPF-network-type, paritaly-mash, Point-to-Point, star-topology