A.Bottom up
B.Component swapping
C.Top down
D.Shoot from the hip
E.Divide and conquer
F.Follow the traffic path

A.OSPF LSA type 5 triggers an LSA type 7 at an ABR between an NSSA and the backbone area
B.OSPF LSA type 1 triggers an LSA type 3 at an ABR.
C.OSPF LSA type 7 triggers an LSA type 5 at an ABR between an NSSA and the backbone area
D.OSPF LSA type 3 triggers an LSA type 4 at an ABR.
E.OSPF LSA type 5 triggers an LSA type 7 at an A5BR but only in N5SAs
F.OSFP LSA type 2 triggers an LSA type 3 at an ABR