Stub Areas
Know LSAs 1, 2, 3, 4, 5, and 7
1 & 2 are intra-area in scope. 3 is inter-area. 5 & 7 are external. (4 is just s support mechanism for 5's, but are technically inter-area)
stub = 1, 2, 3 + 0/0 default
total stub = 1, 2 + 0/0 default
nssa = 1, 2, 3, 7 (the 0/0 is not automatically created here although you an add it)
total nssa = 1, 2, 7 + 0/0 default
Anything that says "total" is "no-summary" on the CLI. Since Type 3 = Summary LSA that should be easy to remember.
1 Router LSA Generated by Any router for any/all links Intra-area
2 Network LSA Generated by a DR only for DR-used-links Intra-area
3 Summary LSA Generated by ABRs to summarize 1 & 2's Inter-area
4 ASBR Summary Generated by ABRs to summarize NH of Type 5 Inter-area
5 External LSA Generated by ASBR Domain-wide (other than stub areas)
7 NSSA External Generated by ASBR specific to NSSA area Only in NSSA area - Translated to Type 5 (+ 4) for other areas