When verifying the OSPF link state database, which type of LSAs should you expect to see within the different OSPF area types? (Choose three.) Select 3 response(s).
A.
All OSPF routers in stubby areas can have type 3 LSAs in their database.
B.
All OSPF routers in stubby areas can have type 7 LSAs in their database.
C.
All OSPF routers in totally stubby areas can have type 3 LSAs in their database.
D.
All OSPF routers in totally stubby areas can have type 7 LSAs in their database.
E.
All OSPF routers in NSSA areas can have type 3 LSAs in their database.
F.
All OSPF routers in NSSA areas can have type 7 LSAs in their database.
I’m batteling to figure out why only NSSA can use type 3 and 7 and not so stubby not.
Answer: A E F
Explanation
Below summarizes the LSA Types allowed and not allowed in area types:
Area Type Type 1 & 2 (within area) Type 3 (from other areas) Type 4 Type 5 Type 7
Standard & backbone Yes Yes Yes Yes No
Stub Yes Yes No No No
Totally stubby Yes No No No No
NSSA Yes Yes No No Yes
Totally stubby NSSA Yes No No No Yes
Popular LSA Types are listed below:
LSA Type Description Details
1 Router LSA Generated by all routers in an area to describe their directly attached links
2 Network LSA Advertised by the DR of the broadcast network (does not cross ABR)
3 Summary LSA Advertised by the ABR of originating area
4 Summary LSA Generated by the ABR of the originating area to advertise an ASBR to all other areas in the autonomous system
5 AS external LSA Used by the ASBR to advertise networks from other autonomous systems
7 Defined for NSSAs Generated by an ASBR inside a Not-so-stubby area (NSSA) to describe routes redistributed into the NSSA