JN0-363 · Question #83
Which LSA type does an OSPF ABR use to advertise external routes generated by an NSSAASBR into the backbone?
The correct answer is B. Type 7. In OSPF, an Area Border Router (ABR) that connects to a Not-So-Stubby Area (NSSA) will convert the Type 7 LSAs generated by an NSSA Autonomous System Boundary Router (ASBR) into Type 5 LSAs to advertise them into the OSPF backbone area (Area 0). Type 7 LSAs are specific to…
Question
Which LSA type does an OSPF ABR use to advertise external routes generated by an NSSAASBR into the backbone?
Options
- AType 5
- BType 7
- CType 3
- DType 1
How the community answered
(48 responses)- A4% (2)
- B73% (35)
- C6% (3)
- D17% (8)
Explanation
In OSPF, an Area Border Router (ABR) that connects to a Not-So-Stubby Area (NSSA) will convert the Type 7 LSAs generated by an NSSA Autonomous System Boundary Router (ASBR) into Type 5 LSAs to advertise them into the OSPF backbone area (Area 0). Type 7 LSAs are specific to NSSAs and are used to advertise external routes within the NSSA.
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